FCC ID: KA2SL2750BT1 Wireless N ADSL2+ 3G USB Router

DSL-2750B User Manual ii Federal Communication Commission Interference Statement Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

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This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. IMPORTANT NOTE:

FCC Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Table of Contents 4.2.1 1 Safety Precautions ............................................................................................ 1 Introduction ........................................................................................................ 1 2 2.1 LEDs and Interfaces ................................................................................ 2 2.2 System Requirements ............................................................................. 4 2.3 Features ................................................................................................... 4 2.4 Standards Compatibility and Compliance ............................................... 5 3 Hardware Installation......................................................................................... 5 3.1 Choosing the Best Location for Wireless Operation ............................... 5 3.2 Connecting the Router............................................................................. 6 4 About the Web Configuration ............................................................................ 7 4.1 Preparation Before Login......................................................................... 7 4.2 Logging In to the Router .......................................................................... 8 First-Time Login .......................................................................... 8 4.3 Setup ....................................................................................................... 9 4.3.1 Wizard ......................................................................................... 9 4.3.2 Internet Setup ............................................................................ 18 4.3.3 Wireless Connection ................................................................. 24 4.3.4 Local Network ........................................................................... 29 Time and Date ........................................................................... 31 4.3.5 Print Server ............................................................................... 32 4.3.6 4.3.7 Logout ....................................................................................... 32 4.4 Advanced ............................................................................................... 33 4.4.1 Wireless Settings ...................................................................... 33 4.4.2 Port Forwarding ......................................................................... 42 Port Triggering ........................................................................... 44 4.4.3 DMZ ........................................................................................... 46 4.4.4 Parental Control ........................................................................ 46 4.4.5 4.4.6 Filtering Options ........................................................................ 50 DNS ........................................................................................... 54 4.4.7 Dynamic DNS ............................................................................ 55 4.4.8 4.4.9 Storage Service ......................................................................... 56 4.5.1 4.5.2 4.5.3 4.5.4 4.5.5 4.5.6 4.4.10 Multicast .................................................................................... 58 4.4.11 Network Tools ............................................................................ 59 4.4.12 Routing ...................................................................................... 71 4.4.13 RIP ............................................................................................ 74 4.4.14 MultiNat ..................................................................................... 74 4.4.15 Schedules ................................................................................. 75 4.4.16 Logout ....................................................................................... 76 4.5 Maintenance .......................................................................................... 77 System ...................................................................................... 77 Firmware Update....................................................................... 78 Access Controls ........................................................................ 78 Diagnostics ................................................................................ 81 System Log ............................................................................... 82 Logout ....................................................................................... 82 4.6 Status ..................................................................................................... 83 4.6.1 Device Info ................................................................................ 83 4.6.2 Wireless Clients ........................................................................ 84 4.6.3 DHCP Clients ............................................................................ 84 Logs ........................................................................................... 85 4.6.4 Statistics .................................................................................... 86 4.6.5 4.6.6 Route info .................................................................................. 87 Logout ....................................................................................... 87 4.6.7 5 FAQs ................................................................................................................ 88 DSL-2750B User Manual i 1 Safety Precautions Follow the following instructions to prevent the device from risks and damage caused by fire or electric power:

Use volume labels to mark the type of power. Use the power adapter packed within the device package. Pay attention to the power load of the outlet or prolonged lines. An overburden power outlet or damaged lines and plugs may cause electric shock or fire accident. Check the power cords regularly. If you find any damage, replace it at once. Proper space left for heat dissipation is necessary to avoid damage caused by overheating to the device. The long and thin holes on the device are designed for heat dissipation to ensure that the device works normally. Do not cover these heat dissipation holes. Do not put this device close to a place where a heat source exists or high temperature occurs. Avoid the device from direct sunshine. Do not put this device close to a place where it is over damp or watery. Do not spill any fluid on this device. Do not connect this device to any PCs or electronic products, unless our customer engineer or your broadband provider instructs you to do this, because any wrong connection may cause power or fire risk. Do not place this device on an unstable surface or support. 2 Introduction The DSL-2750B is a highly integrated ADSL2/2+ Integrated Access Device. It provides DSL uplink, Ethernet LAN and wireless LAN services. The wireless LAN is complied with the IEEE802.11b/g /n standards and supports 2T2R. It is usually prefered to provide high access performance applications for the individual users, the SOHO, the small enterprise and so on. DSL-2750B User Manual 1 2.1 LEDs and Interfaces Front Panel The LED indicators are as follows from left to right: Power, LAN1/2/3/4, WLAN, USB, DSL, Internet. The WPS indicator is on the side panel. The following table describes the LEDs of the device. LED Color Red Green Green through transmitted the WLAN Description The power is off. The power is on and the initialization is normal. The device is initiating. The firmware is upgrading. No LAN link. Data is being transmitted through the LAN interface. The connection of LAN interface is normal. Data is interface. The connection of WLAN interface is normal. The WLAN connection is not established. The connection of USB flash disk has established. Data is being transmitted. No signal is detected. Initial self-test is failed. The device is detecting itself. Initial self-test of the unit has passed. The device is under the Bridge mode, DSL connection is not present, or the power is off. IP is connected and no traffic is detected. The device is attempted to become IP connected, but failed. Status Off On On Blinks Off Blinks On Blinks On Off On Blink Off Off Blinks On Green Off On On Blinks WPS negotiation is enabled, waiting for the Off clients. Device is ready for new WPS to setup. Green Green Green Red Power LAN 1/2/3/4 Green WLAN USB DSL Internet WPS the panel)

(on side DSL-2750B User Manual 2 Description RJ-11 interface that connects to the telephone set through the telephone cable. Ethernet RJ-45 interfaces that connect to the Ethernet interfaces of computers or Ethernet devices. USB host port, for connecting the USB storage devices. Button to enable or disable WLAN. Reset to the factory defaults. To restore factory defaults, keep the device powered on and push a paper clip into the hole. Press down the button for one second, and then release. Power on or off. Interface that connects to the power adapter. The power adapter output is: 12 V DC, 1 A. WPS button to setup connection to client. Rear Panel Interface/Button DSL LAN4/3/2/1 USB WIRELESS ON/OFF RESET ON/OFF POWER WPS (on the side panel) DSL-2750B User Manual 3 Internet Explorer V5.0 or higher, Netscape V4.0 or higher, or Firefox 1.5 or higher 2.2 System Requirements Recommended system requirements are as follows:

An 10 baseT/100BaseT Ethernet card is installed on your PC A hub or switch (attached to several PCs through one of Ethernet interfaces on the device) Operating system: Windows 98SE, Windows 2000, Windows ME, Windows XP, Windows Vista or Windows 7 2.3 Features The device supports the following features:

User-friendly GUI for web configuration Several pre-configured popular games. Just enable the game and the port settings are automatically configured. Compatible with all standard Internet applications Industry standard and interoperable DSL interface Simple web-based status page displays a snapshot of system configuration, and links to the configuration pages Downloadable flash software updates Support for up to 8 permanent virtual circuits (PVC) Support for up to 8 PPPoE sessions Support RIP v1 & RIP v2 WLAN with high-speed data transfer rates of up to 130 Mbps, compatible with IEEE 802.11b/g/n, 2.4GHz compliant equipment Optimized Linux 2.6 Operating System Asynchronous transfer mode (ATM) and digital subscriber line (DSL) support Point-to-point protocol (PPP) Network/port address translation (NAT/PAT) Quality of service (QoS) Wireless LAN security: WPA, 802.1x, RADIUS client Universal plug-and-play(UPnP) File server for network attached storage (NAS) devices Print server Web filtering Management and control IP routing and bridging

- Web-based management (WBM)

- Command line interface (CLI)

- TR-069 WAN management protocol Remote update USB mass-storage System statistics and monitoring DSL-2750B User Manual 4 ITU G.992.1 (G.dmt) ITU G.992.2 (G.lite) ITU G.994.1 (G.hs) ITU G.992.3 (ADSL2) ITU G.992.5 (ADSL2+) 2.4 Standards Compatibility and Compliance Support application level gateway (ALG) ANSI T1.413 Issue 2 IEEE 802.3 IEEE 802.3u IEEE 802.11b IEEE 802.11g IEEE 802.11n 3 Hardware Installation 3.1 Choosing the Best Location for Wireless Operation Many environmental factors may affect the effective wireless function of the DSL Router. If this is the first time that you set up a wireless network device, read the following information:

The access point can be placed on a shelf or desktop, ideally you should be able to see the LED indicators in the front, as you may need to view them for troubleshooting. Designed to go up to 100 meters indoors and up to 300 meters outdoors, wireless LAN lets you access your network from anywhere you want. However, the numbers of walls, ceilings, or other objects that the wireless signals must pass through limit signal range. Typical ranges vary depending on types of materials and background RF noise in your home or business. DSL-2750B User Manual 5 3.2 Connecting the Router

(1) Connect the DSL port of the router and the Modem port of the splitter with a telephone cable; connect the phone to the phone port of the splitter through a cable; and connect the incoming line to the Line port of the splitter. The spliiter has three ports:

LINE: Connect to a wall phone jack (RJ-11 jack) Modem: Connect to the Line interface of the router PHONE: Connect to a telephone set

(2) Connect the LAN port of the router to the network interface card (NIC) of the PC through an Ethernet cable (MDI/MDIX).

(3) Plug the power adapter to the wall outlet and then connect the other end of it to the Power port of the router. DSL-2750B User Manual 6 4 About the Web Configuration The first time you setup the Router. It is recommended that you configure the WAN connection using a single computer, to ensure that both the computer and the Router are not connected to the LAN. Once the WAN connection operates properly, you may continue to make changes to Router configuration, including IP settings and DHCP setup. This chapter is concerned with using your computer to configure the WAN connection. The following chapter describes the various menus used to configure and monitor the Router, including how to change IP settings and DHCP server setup. 4.1 Preparation Before Login Before accessing the Routerre the communication between PC and Router is normal. Check the communication as follows. Configure the IP address of the PC as 192.168.1.X (2~254), net mask as 255.255.255.0, gateway address as 192.168.1.1 (for customized version, configure them according to the actual version). Enter arp -a in the DOS window to check whether the PC can read the MAC address of the Router. Ping the MAINTENANCE IP address (192.168.1.1 by default) of the Router. If the PC can read the MAC address of the Router and can ping through the MAINTENANCE IP address of the Router, that means the communication of the PC and the Router is normal. Note:

When you manage the Router through Web, you must keep the Router power on. Otherwise, the Router may be damaged. DSL-2750B User Manual 7 4.2 Logging In to the Router The following description is a detail How-To user guide and is prepared for first time users. 4.2.1 First-Time Login When you log in to the DSL Router for the first time, the login wizard appears. Step 1 Open a Web browser on your computer. Step 2 Enter http://192.168.1.1 (DSL router default IP address) in the address bar. The login page appears. Step 3 Enter a user name and the password. The default username and password of the super user are admin and admin. The username and password of the common user are user and user. You need not enter the username and password again if you select the option Remember my password. It is recommended to change these default values after logging in to the DSL router for the first time. Step 4 Click Login to log in. DSL-2750B User Manual 8 4.3 Setup 4.3.1 Wizard Wizard enables fast and accurate configuration of Internet connection and other important parameters. The following sections describe these various configuration parameters. When subscribing to a broadband service, you should be aware of the method, by which you are connected to the Internet. Your physical WAN device can be Ethernet, DSL, or both. Technical information about the properties of your Internet connection is provided by your Internet service provider (ISP). For example, your ISP should inform you whether you are connected to the Internet using a static or dynamic IP address, or the protocol, such as PPPoA or PPPoE, that you use to communicate over the Internet. Choose Setup > Wizard. The page shown in the figure appears. Click Setup Wizard. The page shown in the right figure appears. DSL-2750B User Manual 9 There are four steps to configure the device. Click Next to continue. Change the password for logging in to the device. The default password is admin. To secure your network, modify the password timely. Note:

Confirm password must be the same as the new password. To ignore the step, click Skip. DSL-2750B User Manual 10 Set the time and date. First NTP time server: Select the domain of the time server to which system time will be synchronized. Configure the Internet connection. Select the country and ISP. Set the VPI and VCI. If you fail to find the country and ISP from the drop-down lists, select Others. Protocol: The protocol connection type of the interface. You can select PPPoE, PPPoA, Dynamic IP, Static IP, or Bridge. Connection Type: You can select it from the drop-down list according to the uplink equipment. You can select LLC or VC-Mux. VPI: The virtual path identifier of the WAN interface (provided by your ISP). The range is 0 to 255. VCI: The virtual channel identifier for the WAN interface. The range is 32 to 65535 (1 to 31 are reserved for known protocols). DSL-2750B User Manual 11 If the Protocol is PPPoE or PPPoA, the page shown in either of the two figures appears. DSL-2750B User Manual 12 Set the user name and password as provided by your ISP. DSL-2750B User Manual 13 If the Protocol is Static IP, the page shown in the figure appears. Enter the IP Address, Subnet Mask, Default Gateway, and Primary DNS Server. If the Protocol is Dynamic IP or Bridge, the page shown in the figure appears. DSL-2750B User Manual 14 After proper configuration, click Next. DSL-2750B User Manual 15 Configure the wireless network, or keep the default settings. Enter the information and click Next. Enable Your Wireless Network: Enable wireless settings on LAN interface. Wireless Network Name (SSID): SSID is the name of your wireless network. All wireless-equipped devices share to communicate with each other. It must be unique to identify separated wireless network. For security, you should change the default SSID to a special ID. the same SSID Visibility Status: You can select visible or invisible. Security Level: In order to protect your network from hackers and unauthorized users, it is highly recommended you choose one of the following wireless network security settings. WPA Pre-Shared Key: Please set it. Then you will need to enter the same key here into your wireless clients in order to enable proper wireless connection. DSL-2750B User Manual 16 The page shown in the right figure appears. In this page, you can view the configuration information. You can check weather the configurations match the information provided by your ISP. DSL-2750B User Manual 17 4.3.2 Internet Setup Choose Setup > Internet Setup. The page as shown in the right figure appears. In this page, you can configure the WAN interface of the device. DSL-2750B User Manual 18 Click Add in INTERNET SETUP. The page shown in the following figure appears. Description Field PVC Settings Service Category Protocol QoS scheduler Encapsulati on Mode The virtual path between two points in an ATM network and its valid value is from 0 to 255. The virtual channel between two points in an ATM network, ranging from 32 to 65535 (0 to 31 is reserved for local management of ATM traffic). You can select from the drop-down list. You can select from the drop-down list. You can select one of the item between Strict Priority and Weighted Fair Queuing. Select the method of encapsulation provided by your ISP. You can select from the drop-down list. DSL-2750B User Manual 19 Click Next, the page shown in the following figure appears. DSL-2750B User Manual 20 If you select the PPP over Ethernet (PPPoE) or PPP over ATM (PPPoA) as the connection protocol, the following page appears. PPP Username: The correct user name that your ISP provides to you. PPP Password: The correct password that your ISP provides to you. Authentication Method: The value can be AUTO, PAP, CHAP, or MSCHAP. Usually, you can select AUTO. Dial on demand (with idle timeout timer): If this function is enabled, you need to enter the idle timeout time. Within the preset minutes, if the router does not detect the flow of the user continuously, the router automatically stops the PPPoE connection. Once it detects the flow (like access to a webpage), the router restarts the PPPoE dialup. If this function is disabled, the router performs PPPoE dial-up all the time. The PPPoE connnection does not stop, unless the router is powered off and DSLAM or uplink equipment is abnormal. MTU Size: Maximum Transmission Unit. Sometimes, you must modify this function to access network successfully. PPP IP extension: If this function is enabled, the WAN IP address obtained by the router through built-in dial-up can be directly assigned to the PC being attached to the router (at this time, the router connects to only one PC). From the aspect of the PC user, the PC dials up to obtain an IP addres. But actually, the dial-up is done by the router. If this function is disabled, the router itself obtains the WAN IP address. Use Static IP Address: If this function is disabled, the router obtains an IP address assigned by an uplink equipment such as BAS, through PPPoE dial-up. If this function is enabled, the router uses this IP address as the WAN IP address. Enable NAT: Select it to enable the NAT functions of the router. If you do not want to enable NAT and wish the router user to access the Internet normally, you must add a route on the uplink equipment. Otherwise, the access to the Internet fails. Normally, NAT should be enabled. Enable Firewall: Enable or disable IP filtering. Enable IGMP Multicast: IGMP proxy. For example, if you wish that the PPPoE mode supports IPTV, enable this function. DSL-2750B User Manual 21 If you select the MAC Encapsulation Routing(MER) as the connection protocol, the following page appears. Obtain an IP address automatically: The modem obtains a WAN IP address automatically and at this time it enables DHCP client functions. The WAN IP address is obtained from the uplink equipment like BAS and the uplink equipment is required to enable the DHCP server functions. Use the following IP address: If you want to manually enter the WAN IP address, select this check box and enter the information in the field. WAN IP Address: Enter the IP address of the WAN interface provided by your ISP. WAN Subnet Mask: Enter the subnet mask concerned to the IP address of the WAN interface provided by your ISP. Default Gateway: Enter the default gateway. Obtain DNS info automatically from WAN interface: You can get DNS server information from the selected WAN interface Use the following Static DNS IP address: If you want to manually enter the IP address of the DNS server, select this check box and enter the information in the fields. Primary DNS server: Enter the IP address of the primary DNS server. Secondary DNS server: Enter the IP address of the secondary DNS server provided by your ISP. DSL-2750B User Manual 22 After proper settings, click Next. DSL-2750B User Manual 23 4.3.3 Wireless Connection This section includes the wireless connection setup wizard and WPS setup wizard. There are two ways to setup your wireless connection. You can use the Wireless Connection Setup Wizard or you can manually configure the connection. Choose Setup > Wireless Connection. The Wireless Connection page shown in the following figure appears. DSL-2750B User Manual 24 4.3.3.1 Wireless Wizard In Wireless Connection page, Click Wireless Connection Setup Wizard, the page shown in the following figure appears. If you select Use WPA encryption instead of WEP and Manually assign a network key, click Next, the page shown in the following figure appears. DSL-2750B User Manual 25 If you only select Manually assign a network key, click Next, the page shown in the following figure appears. After you enter the network key, the page shown in the following figure appears, you can confirm the wireless settings in this page. Click Save to save the settings. DSL-2750B User Manual 26 4.3.3.2 Wireless Device Add In Wireless Connection page, Click Add Wireless Device with WPS, the page shown in the following figure appears. Select Auto, click Next, the page shown in the following figure appears. When PIN is used, users are only allowed to enter no more than eight digits in the field. Select Manual, click Next, the page shown in the following figure appears. It displays the current wireless settings and you can manually enter the settings in the wireless device thats to be added in the wireless network. DSL-2750B User Manual 27 4.3.3.3 Manual Wireless Setup If you want to configure the Internet settings of you new D-Link Router manually, click Manual Wireless Connection Setup. It will redirect to 4.4.1 Wireless Settings. 4.3.3.4 WPS Reset to Unconfigured In Wireless Connection page, Click Reset to Unconfigured, the page shown in the following figure appears. Once the Reset to Unconfigured button is clicked, the wireless settings will be reset to factory default, other settings will remain unchanged. DSL-2750B User Manual 28 4.3.4 Local Network You can configure the LAN IP address according to the actual application. The preset IP address is 192.168.1.1. You can use the default settings and DHCP service to manage the IP settings for the private network. The IP address of the device is the base address used for DHCP. To use the device for DHCP on your LAN, the IP address pool used for DHCP must be compatible with the IP address of the device. The IP address available in the DHCP IP address pool changes automatically if you change the IP address of the device. You can also enable the secondary LAN IP address. The two LAN IP addresses must be in different networks. Choose Setup > Local Network. The Local Network page shown in the following figure appears. DSL-2750B User Manual 29 By default, Enable DHCP Server is selected for the Ethernet LAN interface of the device. DHCP service supplys IP settings to workstations configured to automatically obtain IP settings that are connected to the device through the Ethernet port. When the device is used for DHCP, it becomes the default gateway for DHCP client connected to it. If you change the IP address of the device, you must also change the range of IP addresses in the pool used for DHCP on the LAN. The IP address pool can contain up to 253 IP addresses. Click Apply to save the settings. In the Local Network page, you can assign IP addresses on the LAN to specific individual computers based on their MAC addresses. Click Add to add static DHCP (optional). The page shown in the following figure appears. Select Enable to reserve the IP address for the designated PC with the configured MAC address. The Computer Name helps you to recognize the PC with the MAC address. For example, Fathers Laptop. Click Apply to save the settings. After the DHCP reservation is saved, the DHCP reservations list displays the configuration. If the DHCP reservations list table is not empty, you can select one or more items and click Edit or Delete. DSL-2750B User Manual 30 4.3.5 Time and Date Choose Setup > Time and Date. The page shown in the following figure appears. In the Time and Date page, you can configure, update, and maintain the correct time on the internal system clock. You can set the time zone that you are in and the network time protocol (NTP) server. You can also configure daylight saving to automatically adjust the time when needed. Select Automatically synchronize with Internet time servers. Select the specific time server and the time zone from the corresponding drop-down lists. Select Enable manual Daylight Saving,overwrite automatic rule if necessary. Set the daylight as you want. Click Apply to save the settings. DSL-2750B User Manual 31 4.3.6 Print Server Choose Setup > Print Server. The page shown in the following figure appears. Select Enable on-board print server, the page shown in the following figure appears. Printer name: can be any text string up to 80 characters. Make and model: can be any text string up to 80 characters. Click Save/Apply to save the settings. 4.3.7 Logout Choose Setup > Logout. The page shown in the following figure appears. In this page, you can log out of the configuration page. DSL-2750B User Manual 32 4.4 Advanced This section includes advanced features used for network management, security and administrative tools to manage the device. You can view status and other information that are used to examine performance and troubleshoot. 4.4.1 Wireless Settings This function is used to modify the standard 802.11 wireless radio settings. It is recommended not to change the default settings, because incorrect settings may impair the performance of your wireless radio. The default settings provide the best wireless radio performance in most environments. Choose ADVANCED > Wireless Settings. The page shown in the following figure appears. DSL-2750B User Manual 33 4.4.1.1 Wireless Basics In the Wireless Settings page, click Wireless Basic, the page shown in the following figure appears. In this page, you can configure the parameters of wireless LAN clients that may connect to the device. Enable Wireless: Select this to turn Wi-Fi on and off. Wireless Network Name (SSID): The Wireless Network Name is a unique name that identifies a network. All devices on a network must share to communicate on the network. If you decide to change the wireless network name from the default setting, enter your new wireless network name in this field. the same wireless network name Visibility Status: You can select Visible or Invisible. Country: Select the country from the drop-down list. Wireless Channel: Select the wireless channel from the pull-down in order menu. It is different for different countries. 802.11 Mode: Select the appropriate 802.11 mode based on the wireless clients in your network. The drop-down menu options are 802.11n auto, 802.11g only, Mixed 802.11g and 802.11b, or 802.11b only. Bandwidth: You can select it from the drop-down list:

Click Apply to save the settings. DSL-2750B User Manual 34 4.4.1.2 Advanced Settings In the Wireless Settings page, click Advanced settings, the page shown in the following figure appears. Multicast Rate: Select the multicast transmission rate for the network. The rate of data transmission should be set depending on the speed of your wireless network. You can select from a range of transmission speeds, or you can select Auto to have the Router automatically use the fastest possible data rate and enable the Auto-Fallback feature. Auto-Fallback will negotiate the best possible connection speed between the Router and a wireless client. The default value is Auto. Fragmentation Threshold: Packets that are larger than this threshold are fragmented into multiple packets. Try to increase the fragmentation threshold if you encounter high packet error rates. Do not set the threshold too low, since this can result in reducing networking performance. RTS Threshold: This value should remain at its default setting of 2347.Should you encounter inconsistent data flow, only minor reductions are recommended. Should you encounter inconsistent data flow, only minor reduction of the default value, 2347 is recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will not be enabled. The Router sends Request to Send

(RTS) frames to a particular receiving station and negotiates the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS) frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value of 2347. DTIM Interval: (Delivery Traffic Indication Message) Enter a value between 1 and 255 for the Delivery Traffic Indication Message (DTIM.) A DTIM is a countdown informing clients of the next window for listening to broadcast and multicast messages. Beacon Interval: A beacon is a packet of information that is sent from a connected device to all other devices where it announces its availability and readiness. A beacon interval is a period of time (sent with the beacon) before sending the beacon again. The beacon interval may be adjusted in milliseconds (ms). Default (100) is recommended. Global Max Clients: Specifies maximum wireless client stations to be enble to link with AP. Once the clients exceed the max vlaue, all other clients will be refused. DSL-2750B User Manual 35 Transmit Power: Adjust the transmission range here. This tool can be helpful for security purposes if you wish to limit the transmission range. WMM (Wi-Fi Multimedia): Select whether WMM is enable or disabled. Before you disable WMM, you should understand that all QoS queues or traffic classes related to wireless do not take effect. Enable Wireless: Select this to turn Wi-Fi on and off. Wireless Network Name (SSID): The Wireless Network Name is a unique name that identifies a network. All devices on a network must share the same wireless network name in order to communicate on the network. If you decide to change the wireless network name from the default setting, enter your new wireless network name in this field. Visibility Status: You can select Visible or Invisible. User Isolation: When many clients connect to the same access point, they can access each other. If you want to disable the access between clients which connect the same access point, you can select On to enable this service. Disable WMM Advertise: You can select On or Off from the drop-down Enable Wireless Multicast Forwarding (WMF): You can select On or Max Clients: Specifies maximum wireless client stations to be enble to GUEST/VIRTUAL ACCESS POINT: If you want to make Guest/Virtual network function be available, you can set the parameters below. These settings are only for more technically advanced users who have sufficient knowledge about wireless LAN. Do not change these settings unless you know the effect of changes on the device. Click Apply to save the settings. list. Off from the drop-down list. link with AP. DSL-2750B User Manual 36 4.4.1.3 MAC Filtering In the Wireless Settings page, click MAC Filtering, the page shown in the following figure appears. In this page, you can allow or deny users access the wireless router based on their MAC address. Click Add, the page shown in the following figure appears. DSL-2750B User Manual 37 4.4.1.4 Security Settings In the Wireless Settings page, click Security Settings. The page shown in the following figure appears. Select the SSID that you want to configure from the drop-down list. Select the encryption type from the Security Mode drop-down list.You can select None, WEP, WPA-Personal and WPA-Enterprise. DSL-2750B User Manual 38 If you select WEP, the page shown in the following figure appears. WEP (Wireless Encryption Protocol) encryption can be enabled for security and privacy. WEP encrypts the data portion of each frame transmitted from the wireless adapter using one of the predefined keys. The router offers 64 or 128 bit encryption with four keys available. Select Encryption Strength from the drop-down menu. (128 bit is stronger than 64 bit) Enter the key into the Network Key field 1~4. (Key length is outlined at the bottom of the window.) Click Apply/Save to save the settings. DSL-2750B User Manual 39 If you select WPA-Personal, the page shown in the following figure appears. DSL-2750B User Manual 40 If you select WPA- Enterprise, the page shown in the following figure appears. You can only use WPA-enterprise if you have set up RADIUS server. This is the WPA/WPA2 authentication with RADIUS server instead of pre-shared key. DSL-2750B User Manual 41 4.4.2 Port Forwarding This function is used to open ports in your device and re-direct data through those ports to a single PC on your network (WAN-to-LAN traffic). It allows remote users to access services on your LAN, such as FTP for file transfers or SMTP and POP3 for e-mail. The device accepts remote requests for these services at your global IP address. It uses the specified TCP or UDP protocol and port number, and redirects these requests to the server on your LAN with the LAN IP address you specify. Note that the specified private IP address must be within the available range of the subnet where the device is in. Choose ADVANCED > Port Forwarding. The page shown in the following figure appears. DSL-2750B User Manual 42 Click Add to add a virtual server. Select a service for a preset application, or enter a name in the Custom Server field. Enter an IP address in the Server IP Address field, to appoint the corresponding PC to receive forwarded packets. The Ports show the ports that you want to open on the device. The TCP/UDP means the protocol type of the opened ports. DSL-2750B User Manual 43 Click Apply to save the settings. The page shown in the following figure appears. A virtual server is added. 4.4.3 Port Triggering Some applications require that specific ports in the firewall of the device are open for the remote parties to access. Application rules dynamically open the firewall ports when an application on the LAN initiates a TCP/UDP connection to a remote party using the trigger ports. The device allows the remote party from the WAN side to establish new connections back to the application on the LAN side using the firewall ports. A maximum of 32 entries can be configured. Choose ADVANCED > Port Triggering. The page shown in the following figure appears. DSL-2750B User Manual 44 Click Add to add a new Port Trigger. Click the Select an application drop-down menu to choose the application you want to setup for port triggering. When you have chosen an application the default Trigger settings will populate the table below. If the application you want to setup isnt listed, click the Custom application radio button and type in a name for the trigger in the Custom application field. Configure the Trigger Port Start, Trigger Port End, Trigger Protocol, Open Port Start, Open Port End and Open Protocol settings for the port trigger you want to configure. When you have finished click the Apply button. DSL-2750B User Manual 45 4.4.4 DMZ Since some applications are not compatible with NAT, the device supports the use of a DMZ IP address for a single host on the LAN. This IP address is not protected by NAT and it is visible to agents on the Internet with the correct type of software. Note that any client PC in the DMZ is exposed to various types of security risks. If you use the DMZ, take measures (such as client-based virus protection) to protect the remaining client PCs on your LAN from possible contamination through DMZ. Choose ADVANCED > DMZ. The page shown in the following figure appears. Click Apply to save the settings. 4.4.5 Parental Control Choose ADVANCED > Parental Control. The Parent Control page shown in the following figure appears. This page provides two useful tools for restricting the Internet access. Block Websites allows you to quickly create a list of all websites that you wish to stop users from accessing. Block MAC Address allows you to control when clients or PCs connected to the device are allowed to access the Internet. DSL-2750B User Manual 46 4.4.5.1 Block Website In the Parent Control page, click Block Website. The page shown in the following figure appears. Click Add. The page shown in the following page appears. Enter the website in the URL field. Select the Schedule from drop-down list, or select Manual Schedule and select the corresponding time and days. DSL-2750B User Manual 47 Click Apply to add the website to the BLOCK WEBSITE table.The page shown in the following figure appears. 4.4.5.2 Block MAC Address In the Parent Control page, click Block MAC Address. The page shown in the following figure appears. DSL-2750B User Manual 48 Click Add. The page shown in the following figure appears. Enter the use name and MAC address and select the corresponding time and days. Click Apply to add the MAC address to the BLOCK MAC ADDRESS table. The page shown in the following figure appears. DSL-2750B User Manual 49 4.4.6 Filtering Options Choose ADVANCED > Filtering Options. The Filtering Options page shown in the following figure appears. 4.4.6.1 Inbound IP Filtering In the Filtering Options page, click Inbound IP Filtering. The page shown in the following figure appears. DSL-2750B User Manual 50 Click Add to add an inbound IP filter. The page shown in the following figure appears. Enter the Filter Name and specify at least one of the following criteria: protocol, source/destination IP address, subnet mask, and source/destination port. Click Apply to save the settings. The ACTIVE INBOUND FILTER shows detailed information about each created inbound IP filter. Note:

The settings only apply when the firewall is enabled. DSL-2750B User Manual 51 4.4.6.2 Outbound IP Filtering By default, all outgoing IP traffic from the LAN is allowed. The outbound filter allows you to create a filter rule to block outgoing IP traffic by specifying a filter name and at least one condition. In the Filtering Options page, click Outbound IP Filtering. The page shown in the following figure appears. Click Add to add an outbound IP filter. The page shown in the following figure appears. Enter the Filter Name and specify at least one of the following criteria: protocol, source/destination IP address, subnet mask, and source/destination port. Click Apply to save the settings. The ACTIVE OUTGOING IP FILTER shows detailed information about each created outbound IP filter. DSL-2750B User Manual 52 4.4.6.3 Bridge Filtering In the Filtering Options page, click Bridge Filtering. The page shown in the following figure appears. This page is used to configure bridge parameters. In this page, you can change the settings or view some information of the bridge and its attached ports. DSL-2750B User Manual 53 Click Add to add a bridge filter. The page shown in the following figure appears. Click Apply to save the settings. 4.4.7 DNS IP address. For example, Domain name system (DNS) is an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they are easier to remember. The Internet, however, is actually based on IP addresses. Each time you use a domain name, a DNS service must translate the name into the corresponding the domain name www.example.com might be translated to 198.105.232.4. The DNS system is, in fact, its own network. If one DNS server does not know how to translate a particular domain name, it asks another one, and so on, until the correct IP address is returned. Choose ADVANCED > DNS. The page shown in the folllowin g figure appears. DNS SERVER CONFIGURATION If you are using the device for DHCP service on the LAN or if you are using DNS servers on the ISP network, select Obtain DNS Info from a WAN interface. If you have DNS IP addresses provided by your ISP, enter these IP addresses in the available entry fields for the preferred DNS server and the alternate DNS server. Click Apply to save the settings. DSL-2750B User Manual 54 4.4.8 Dynamic DNS The device supports dynamic domain name service (DDNS). The dynamic DNS service allows a dynamic public IP address to be associated with a static host name in any of the many domains, and allows access to a specified host from various locations on the Internet. Click a hyperlinked URL in the form of hostname.dyndns.org and allow remote access to a host. Many ISPs assign public IP addresses using DHCP, so locating a specific host on the LAN using the standard DNS is difficult. For example, if you are running a public web server or VPN server on your LAN, DDNS ensures that the host can be located from the Internet even if the public IP address changes. DDNS requires that an account be set up with one of the supported DDNS service providers

(DyndDNS.org or dlinkddns.com). Choose ADVANCED > Dynamic DNS. The page shown in the following page appears. Click Add to add dynamic DNS. The page shown in the following figure appears. DDNS provider: Select one of the DDNS registration organizations from the down-list drop. Host Name: Enter the host name that you registered with your DDNS service provider. Interface: Select the interface you want to use. Username: Enter the user name for your DDNS account. Password: Enter the password for your DDNS account. Click Apply to save the settings. DSL-2750B User Manual 55 4.4.9 Storage Service Choose ADVANCED > Storage Service. The Storage Service page shown in the following figure appears. 4.4.9.1 Storage Device Info n the Storage Service page, click Storage Device Info. The page shown in the following figure appears. When you insert USB storage, this page will show the information of USB storage, such as file system, total space and used space. DSL-2750B User Manual 56 4.4.9.2 User Accounts In the Storage Service page, click Storage User Account. The page shown in the following figure appears. Click Add to add a user. The page shown in the following figure appears. Username:set valid user that access CPEs samba server Password:users password Confirm Password:users password volumeName:the directory you want to share DSL-2750B User Manual 57 4.4.10 Multicast Choose ADVANCED > Multicast. The page shown in the following figure appears. Default Version:IGMP version Query Interval(s):The query interval is the amount of time in seconds between IGMP General Query messages sent by the router (if the router is the querier on this subnet) Query Response Interval (1/10s): The query response interval is the maximum amount of time in seconds that the IGMP router waits to receive a response to a General Query message. The query response interval is the Maximum Response Time field in the IGMP v2 Host Membership Query message header. The default query response interval is 10 seconds and must be less than the query interval Last Member Query Interval (1/10s): The last member query interval is the amount of time in seconds that the IGMP router waits to receive a response to a Group-Specific Query message. The last member query interval is also the amount of time in seconds between successive Group-Specific Query messages. Robustness Value: The robustness variable is a way of indicating how susceptible the subnet is to lost packets. IGMP can recover from robustness variable minus 1 lost IGMP packets. Maximum Multicast Groups:max multicast groups Maximum Multicast Data Sources (for IGMPv3): max group data sources that want to receive. Maximum Multicast Group Members:Max member in one group Fast Leave Enable: Enable or disable fast leave feature. LAN to LAN (Intra LAN) Multicast Enable: Enable or disable Lan to Lan msulticast. DSL-2750B User Manual 58 4.4.11 Network Tools Choose ADVANCED > Network Tools. The page shown in the following figure appears. DSL-2750B User Manual 59 In the NETWORK TOOLS page, you can configure port mapping, IGMP, quality of service, queue, QoS classification, UPnP, ADSL settings, SNMP, TR-069, and certificates the navigation. through clicking DSL-2750B User Manual 60 4.4.11.1 Port Mapping Choose ADVANCED > Network Tools and click Port Mapping. The page shown in the following figure appears. In this page, you can bind the WAN interface and the LAN interface to the same group. DSL-2750B User Manual 61 Click Add to add port mapping. The page shown in the following figure appears. The procedure for creating a mapping group is as follows:

Step 1 Enter the group name. Step 2 Select the WAN interface for your new group. Step 3 Select LAN interfaces from the Available Interface list and click the

<- arrow button to add them to the grouped interface list, in order to create the required mapping of the ports. The group name must be unique. Step 4 Enter the option information of DHCP vendor IDs. Step 5 Click Apply to save the settings. DSL-2750B User Manual 62 DSL-2750B User Manual 63 4.4.11.2 IGMP Choose ADVANCED > Network Tools and click IGMP. The page shown in the following figure appears. When enable IGMP Snooping, the multicast data transmits through the specific LAN port which has received the request report. 4.4.11.3 Quality of Service Choose ADVANCED > Network Tools and click Quality of Service. The page shown in the following figure appears. In this page, you can enable/disable the QoS. Click Save/Apply to take the setting effect. DSL-2750B User Manual 64 4.4.11.4 Queue Config Choose ADVANCED > Network Tools and click Queue Config. The page shown in the following figure appears. Click Add. The page shown in the following figure appears. Click Save/Apply to save the settings. DSL-2750B User Manual 65 4.4.11.5 QoS Classification Choose ADVANCED > Network Tools, and click QoS Classification, the page shown in the following figure appears.This page allows you to config various classification. DSL-2750B User Manual 66 Click Add. The page shown in the following figure appears. DSL-2750B User Manual 67 4.4.11.6 UPnP Choose ADVANCED > Network Tools and click UPnP. The page shown in the following figure appears. In this page, you can configure universal plug and play (UPnP). The system acts as a daemon after you enable UPnP. UPnP is used for popular audio visual software. It allows automatic discovery of your device in the network. If you are concerned about UPnP security, you can disable it. Block ICMP ping should be enabled so that the device does not respond to malicious Internet requests. Click Apply to save the settings. 4.4.11.7 ADSL Choose ADVANCED > Network Tools and click ADSL Settings. The page shown in the following figure appears. In this page, you can select the DSL modulation. Normally, you can keep the factory default setting. The device negotiates the modulation mode with DSLAM. Click Apply to save the settings. DSL-2750B User Manual 68 4.4.11.8 SNMP Choose ADVANCED > Network Tools and click SNMP. The page shown in the right figure appears. In this page, you can set SNMP parameters. Read Community: The network administrator must use this password to read the information of this device. Set Community: The network administrator must use this password to configure the information of this device. Trap Manager IP: The trap information is sent to this host. Click Apply to save the settings. DSL-2750B User Manual 69 4.4.11.9 TR-069 Choose ADVANCED > Network Tools and click TR-069. The page shown in the following figure appears. In this page, you can configure the TR-069 CPE. WAN Management Protocol (TR-069) allows a Auto-Configuration Server

(ACS) to perform auto-configuration, provision, collection, and diagnostics to this device. In this page, you may configure the parameters such as the ACS URL, ACS password, and connection request user name. After finishing setting, click Apply to save and apply the settings. 4.4.11.10 Certificates Choose ADVANCED > Network Tools and click Certificates. The Certificates page shown in the following figure appears. In this page, you can configure local certificate and trusted certificate. DSL-2750B User Manual 70 4.4.12 Routing Choose ADVANCED > Routing. The page shown in the following page appears. 4.4.12.1 Static Route Choose ADVANCED > Routing and click Static Route. The page shown in the following figure appears. This page is used to configure the routing information. In this page, you can add or delete IP routes. DSL-2750B User Manual 71 Click Add to add a static route. The page shown in the following figure appears. Destination Network Address: The destination IP address of the router. Subnet Mask: The subnet mask of the destination IP address. Use Gateway IP Address: The gateway IP address of the router. Use Interface: The interface name of the router output port. You can click Use Gateway IP Address or Use Interface. Click Apply to save the settings. 4.4.12.2 Default Gateway Choose ADVANCED > Routing and click Default Gateway. The page shown in the following figure appears. Select the WAN interface as your default gateway. Click Apply to save the settings. DSL-2750B User Manual 72 4.4.12.3 Policy Routing Choose ADVANCED > Routing and click policy Routing. The page shown in the following figure appears. The policy route binds one WAN connection and one LAN interface. Click Add, the page shown in the following figure appears. DSL-2750B User Manual 73 4.4.13 RIP Choose ADVANCED > Routing and click RIP. The page shown in the following figure appears. This page is used to select the interfaces on your device that use RIP and the version of the protocol used. If you are using this device as a RIP-enabled device to communicate with others using the routing information protocol, enable RIP and click Apply to save the settings. 4.4.14 MultiNat Network address translation (NAT) is the process of modifying network address information in IP packet headers while in transit across a traffic routing device for the purpose of remapping a given address space into another. The packets which source IP address match between internalStart and internalEnd in the NAT table come to the router, the router changes source IP of this packet by the IP address that set between externalStart and externalEnd, then transmit the packet into Internet. Choose ADVANCED > MultiNat. The page shown in the following figure appears. DSL-2750B User Manual 74 Click Add, the page shown in the following figure appears. In this page, please select the proper type; select the proper Use interface, and configure the other parameters in this page. After finishing setting, click Apply to save the settings. 4.4.15 Schedules Choose ADVANCED > Schedules. The page shown in the following figure appears. DSL-2750B User Manual 75 Click Add to add schedule rule. The page shown in the following figure appears. Click Apply to save the settings. 4.4.16 Logout Choose ADVANCED > Logout. The page shown in the following figure appears. In this page, you can log out of the configuration page. DSL-2750B User Manual 76 4.5 Maintenance 4.5.1 System Choose MAINTENANCE > System. The System page shown in the following figure appears. In this page, you can reboot device, back up the current settings to a file, restore the settings from the file saved previously, and restore the factory default settings. The buttons in this page are described as follows:

Reboot: Reboot the device. Backup Settings: Save the settings to the local hard drive. Select a location on your computer to back up the file. You can name the configuration file. Update settings: Click Browse to select the configuration file of device and click Update Settings to begin restoring the device configuration.. Restore Default Settings: Reset the device to default settings. Notice: Do not turn off your device or press the Reset button while an operation in this page is in progress. DSL-2750B User Manual 77 4.5.2 Firmware Update Choose MAINTENANCE > Firmware Update. The page shown in the following figure appears. In this page, you can upgrade the firmware of the device. The procedure for updating the firmware is as follows:

Step 1 Click Browseto search the file. Step 2 Click Update Firmware to update the configuration file. The device loads the file and reboots automatically. Notice: Do not turn off your device or press the reset button while this procedure is in progress. 4.5.3 Access Controls Choose MAINTENANCE > Access Controls. The Access Controls page shown in the following figure appears. The page contains Account Password, Services. DSL-2750B User Manual 78 4.5.3.1 Account Password In the Access Controls page, click Account Password. The page shown in the following figure appears. In this page, you can change the password of the user and set time for automatic logout. You should change the default password to secure your network. Ensure that you remember the new password or write it down and keep it in a safe and separate location for future reference. If you forget the password, you need to reset the device to the factory default settings and all configuration settings of the device are lost. Select the Username from the drop-down list. You can select admin, support, or user. Enter the current and new passwords and confirm the new password, to change the password. Click Apply to apply the settings. DSL-2750B User Manual 79 4.5.3.2 Services In the Access Controls page, click Services. The page shown in the following figure appears. In this page, you can enable or disable the services that are used by the remote host. For example, if telnet service is enabled and port is 23, the remote host can access the device by telnet through port 23. Normally, you need not change the settings. Select the management services that you want to enable or disable on the LAN or WAN interface. Click Apply to apply the settings. Note:

If you disable HTTP service, you cannot access the configuration page of the device any more. DSL-2750B User Manual 80 4.5.4 Diagnostics Choose MAINTENANCE > Diagnostic. The page shown in the following figure appears. In this page, you can test the device. This page is used to test the connection to your local network, and the connection to your DSL service provider. Click Rerun Diagnostics Test to run diagnostics. DSL-2750B User Manual 81 4.5.5 System Log Choose MAINTENANCE > System Log. The System Log page shown in the following figure appears. This page displays event log data in the chronological manner. You can read the event log from the local host or send it to a system log server. Available event severity levels are as follows: Emergency, Alert, Critical, Error, Warning, Notice, Informational and Debugging. In this page, you can enable or disable the system log function. The procedure for logging the events is as follows:

Step 1 Select Enable Log check box. Step 2 Select the display mode from the Mode drop-down list. Step 3 Enter the Server IP Address and Server UDP Port if the Mode is set to Both or Remote. Step 4 Click Apply to apply the settings. Step 5 Click View System Log to view the detail information of system log. 4.5.6 Logout Choose MAINTENANCE > Logout. The page shown in the following figure appears. In this page, you can log out of the configuration page. DSL-2750B User Manual 82 4.6 Status You can view the system information and monitor performance. 4.6.1 Device Info Choose STATUS > Device Info. The page shown in the following figure appears. The page displays the summary of the device status, including the system information, Internet information, wireless information and local network information. DSL-2750B User Manual 83 4.6.2 Wireless Clients Choose STATUS > Wireless Clients. The page shown in the following figure appears. The page displays authenticated wireless stations and their statuses. 4.6.3 DHCP Clients Choose STATUS > DHCP Clients. The page shown in the following page appears. This page displays all client devices that obtain IP addresses from the device. You can view the host name, IP address, MAC address and time expired(s). DSL-2750B User Manual 84 4.6.4 Logs Choose STATUS > Logs. The page shown in the following figure appears. This page lists the system log. Click Refresh to refresh the system log shown in the table. DSL-2750B User Manual 85 4.6.5 Statistics Choose STATUS > Statistics. The page shown in the following figure appears. This page displays the statistics of the network and data transfer. This information helps technicians to identify if the device is functioning properly. The information does not affect the function of the device. DSL-2750B User Manual 86 4.6.6 Route info Choose STATUS > Route Info. The page shown in the following figure appears. The table shows a list of destination routes commonly accessed by the network. 4.6.7 Logout Choose STATUS > Logout. The page shown in the following figure appears. In this page, you can log out of the configuration page. DSL-2750B User Manual 87 Answer Check the connection between the power adapter and the power socket. Check whether the power switch is turned on. Check the following:

The connection between the device and the PC, the hub, or the switch. The running status of the computer, hub, or switch. The cables that connects the device and other devices:

If the device connects to a computer, use the cross over cable. If the device connects to a hub or a switch, use the straight-through cable. Check the connection between the DSL interface of the device and the socket. Ensure that the following information is entered correctly:

User name and password Choose start > Run from the desktop. Enter Ping 192.168.1.1 (the default IP address of the device) in the DOS window. If the web configuration page still cannot be accessed, check the following configuration:

The type of the network cable The connection between the device and the computer The TCP/IP properties of the network card of the computer Keep the device powered on and press the RESET button for 1 second. Then, the device automatically reboots and is restored to the factory default configuration. The default configuration of the device is as follows:

IP address: 192.168.1.1 Subnet mask: 255.255.255.0. User name and password of super account: admin/admin User name and password of common account: admin/admin 5 FAQs Question Why are all the indicators off?

Why is the LAN indicator not on?

Why is the DSL indicator not on?

Why does the Internet access fail when the DSL indicator is on?

Why does the web configuration page of the device fail to be accessed?

How to restore the default configuration after incorrect configuration?

DSL-2750B User Manual 88 FCC Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Radiation Exposure Statement This device complies with FCC radiation exposure limits set forth for an uncontrolled environment and it also complies with Part 15 of the FCC RF Rules. This equipment must be installed and operated in accordance with provided instructions and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. End-users and installers must be provided with antenna installation instructions and consider removing the no-collocation statement. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and

(2) this device must accept any interference received, including interference that may cause undesired operation. Caution!

Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. DSL-2750B User Manual 89