SmartCell Repeater User Manual 33 dBm July, 2012 Version 1.0
- INDEX -
User Manual SmartCell Repeater 1. INTRODUCTION ............................................................................................................. 3 1.1 GST SmartCell Repeater Advantages ........................................................................... 5 1.2 Abbreviation ................................................................................................................. 5 2. SYSTEM CONFIGURATION ............................................................................................. 7 2.1 SmartCell Repeater Service Network Configuration .................................................... 7 2.2 System Design and Operation ...................................................................................... 8 2.2.1 System Design ....................................................................................................... 8 2.2.2 Downlink/ Uplink Path ........................................................................................ 10 2.2.3 700MHz Frequency Selection .............................................................................. 11 2.2.4 850MHz Frequency Selection .............................................................................. 11 2.2.5 1900MHz Frequency Selection ............................................................................ 12 2.2.6 2100MHz Frequency Selection ............................................................................ 13 3. SETUP ........................................................................................................................... 14 3.1 Equipment Needed for Repeater Setup ...................................................................... 14 3.1.1 Check points before turning on the Repeater ...................................................... 14 3.1.2 Ready for Service ................................................................................................. 15 3.1.3 Signal Strength LED Check .................................................................................. 15 3.2 Setting up the Repeater ............................................................................................. 15 3.2.1 Quick GUI/Configuration ..................................................................................... 16 3.2.2 Quick Setup ......................................................................................................... 16 3.3 WebUI Ranges Table .................................................................................................. 16 3.4 Troubleshooting ......................................................................................................... 17 3.4.1 Simple Troubleshooting Method .......................................................................... 17 3.4.2 Alarm Information ............................................................................................... 17 3.4.3 Troubleshooting Guide Related to RF .................................................................. 20 3.4.4 Troubleshooting Guide Related to NMS ............................................................... 22 2 U.S.A. User Manual SmartCell Repeater U.S.FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT INFORMATION TO THE USER NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. 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 encourage to try to correct the interference by one or more of the following measures:
receiver is connected. Changes or modification not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. Connecting of peripherals requires the use of grounded shielded signal cables. Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet of a circuit different from that to which the Consult the dealer or an experienced radio/TV technician for assistance. 3 IC Warning User Manual SmartCell Repeater This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause undesired operation of the device. Le prsent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorise aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible d'en compromettre le fonctionnement. 4 1. INTRODUCTION User Manual SmartCell Repeater SmartCell is a modular repeater designed to improve signals in blanket/shadow areas inside buildings. It can transmit signals at 700MHz, 850MHz, 1900MHz, and 2100MHz frequencies. User may choose filtering configurations according to the specific sites requirements. 1.1 GST SmartCell Repeater Advantages It provides selectable RF power levels for any wireless technology / band. It provides monitoring for multiple technologies. Its digital filter provides optimized RF performance. It allows the users to modify the technologies via a web user interface. It is easy to add or change frequencies. It has scalable modular design. Data service is improved by the addition of 4G (LTE). Wall mount or rack mountable single chassis design. AMP modules are interchangeable and hot swappable. Optional low loss multiplexor allows user a centralized cable connection point for donor and service antennas. Multiples of same technology amplifiers can be used simultaneously. A single PSU provides power to the entire system up to 4 amplifier modules. 1.2 Abbreviation DFM PSU ALC SNMP AOC Digital Filter Module Power Supply Unit Auto Level Control Simple Network Management Protocol Auto Oscillation Control 5 CAUTION User Manual SmartCell Repeater THIS EQUIPMENT IS INDOOR USE ALL THE COMMUNICATION WIRINGS ARE LIMITED TO INSIDE OF THE BUILDING RISK OF EXPLOSION IF BATTERY ON CONTROLLER BOARD IS REPLACED WITH AN INCORRECT TYPE. DISPOES OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS. THE SOCKET-OUTLET SHALL BE INSTALLED NEAR THE EQUIPMENT SHALL BE EASILY ACCESIBLE. THIS POWER OF THIS SYSTEM SHALL BE SUPPLED THROUGH WIRING INSTALLED IN A NORMAL BUILDING. IF POWERED DIRECTLY FROM THE MAINS DISTRIBUTION SYSTEM, IT SHALL BE USED ADDITIONAL PROTECTION, SUCH AS OVER VOLTAGE PROTECTION DEVICE. 6 User Manual SmartCell Repeater 2. SYSTEM CONFIGURATION 2.1 SmartCell Repeater Service Network Configuration The SmartCell Modular Repeater is designed to improve coverage and capacity of LTE, PCS, Celluar, and AWS services. The repeater can provide in building coverage for all trouble areas. SmartCell is easy to install, has remote status monitoring and control functions (NMS System) via a wired line and wireless modem.
<Figure 1> In-building Repeater Service Organization 7 2.2 System Design and Operation 2.2.1 System Design User Manual SmartCell Repeater 1 2 3 4 5 6 7 8 9 10 11 12 13 17 15 16 14
<Figure 2> SmartCell Repeater Front Design NO. 1 2 3 4 5 6 7 8 9 PART SNMP FEU (Cavity Filter), optional Service Unit #1 Service Unit #2 Service Unit #3 Service Unit #4 CLI UPS LAN Port NO. 10 11 12 13 14 15 16 17 PART WAN 1 Port WAN 2 Port Modem Antenna Connection Port Donor Port(s) Service Port(s) Status LED (RUN/Alarm/Shutdown) Input / Output LED Release Button 8 User Manual SmartCell Repeater 2 4 3 5 1
<Figure 3> SmartCell Repeater Back Design NO. 1 2 3 PORT Main FAN Assembly PSU FAN Main Power Switch NO. 4 5 PORT DC 12V Output Connection Power Cable 9 User Manual SmartCell Repeater 2.2.2 Downlink/ Uplink Path The user may select frequency bands according to the site conditions. After receiving a signal from the donor antenna(s), the repeater improves it and sends a securely isolated signal out to the service antenna(s). Each amplifier module has its own separate digital filter module (DFM). The amplifier module consists of a down converter, up converters, cavity filter, and power amplifier (PAU). In the Downlink Path:
1. RF Signal is received from the donor antenna through the input port. 2. The signal is then converted from RF to IF, 3. The IF signal is digitized by the DA converter, 4. The digital signal is filtered by the DFM (FPGA), 5. The modulator converts the digital signal to an analog RF signal and transmits to the amplifier. 6. Amplifier outputs final signal to service antennas at desired output power. Uplink path works in reverse order. DFM 10
<Figure 5> SmartCell Repeater Block Diagram User Manual SmartCell Repeater 2.2.3 700MHz Frequency Selection
<Figure 6> 700MHz Band Frequency The 700MHz AMP module complies with LTE 3GPP requirements, where a maximum of two non-
contiguous block configurations are available. Each block is adjustable per 5 MHz. 2.2.4 850MHz Frequency Selection
<Figure 7> 850MHz Band Frequency The 850MHz AMP module provides Cellular service, where a maximum of two non-contiguous block configurations are available. Each block is adjustable to the following bandwidth configurations:
A1: 11MHz B1: 10MHz A2: 1.5MHz B2: 2.5MHz 11 2.2.5 1900MHz Frequency Selection User Manual SmartCell Repeater
<Figure 8> 1900MHz Band Frequency The 1900MHz AMP module complies with PCS Band blocks, where a maximum of three non-
contiguous filtering configurations are available. Each sub block is adjustable per 1.25MHz bandwidth steps up to 20MHz. The Following table shows user selectable channel numbers. DL CENTER
[MHz]
CHANNEL BAND DL CENTER
[MHz]
CHANNEL 1931.25 1932.5 1933.75 1935 1936.25 1937.5 1938.75 1940 1941.25 1942.5 1943.75 1945 1946.25 1947.5 1948.75 1950 1951.25 1952.5 1953.75 1955 1956.25 1957.5 1958.75 1960 1961.25 1962.5 1963.75 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 625 650 675 A1 guard A A2 guard A3 guard D guard B1 guard B B2 guard B3 BAND guard E guard F guard C1 guard C C2 guard C3 1965 1966.25 1967.5 1968.75 1970 1971.25 1972.5 1973.75 1975 1976.25 1977.5 1978.75 1980 1981.25 1982.5 1983.75 1985 1986.25 1987.5 1988.75 G 1992.5 12 700 725 750 775 800 825 850 875 900 925 950 975 1000 1025 1050 1075 1100 1125 1150 1175 1225 1250 1275 User Manual SmartCell Repeater 2.2.6 2100MHz Frequency Selection F1 F2
<Figure 9> 2100MHz Band Frequency The 2100MHz AMP module complies with CDMA band requirements, where two block configurations are available. In order to set contiguous band F, check Band F1, Band F2 and contiguous button in the WEB UI. In order to set Band F1 or Band 2 do not check contiguous button in WEB UI. Band F configuration is as follows:
BAND F1 guard F2 Downlink Uplink Start 2145.15
Stop 2149.85
Start 1745.15
Stop 1749.85
2150.15 2154.85 1750.15 1754.85 F 13 3. SETUP 3.1 Equipment Needed for Repeater Setup User Manual SmartCell Repeater Parameter Item Quantity Remark Major Component SmartCell Repeater Wall Mounting Bracket CD which contains User Manual and Installation Guide Ethernet Cable 6.6ft (2m) Ground Cable 6.6ft (2m) Ground Sems Screw M4 x 8mm Bracket Sems Screw M5 x 10mm Lag Screw 12.7mm x 50.8mm FEU-AMP RF cable FEU-Wall Bracket RF cable Modem-FEU RF Cable Donor ANT Server ANT Antenna connection Cable Spectrum Analyzer Additional Components Antenna RF Cable Testing and Measuring Equipment 1 EA 1 EA 1 EA 1 EA 1 EA 4 EA 20 EA 4 EA 8 EA 2 EA 1EA 1 EA 1 EA TBD 1 EA Provided by GST Provided by GST Not Included Not Included Not Included 3.1.1 Check points before turning on the Repeater 1) System Power Check: AC electrical power to the repeater should be 110V. Input electricity only after power verification. 2) Input RF Signal Range: Optimal input RSSI into the repeater is -57dBm ~ -27dBm for 700MHz/850MHz/1900MHz/2100MHz. User should verify input condition of Donor ANT. If the input RSSI exceeds -27dBm, then external attenuators should be added. 3) Isolation check between DONOR/SERVER ANT: Isolation condition of this equipment is 105dBc (Gain+15dB). The User should check this condition before installation. 14 3.1.2 Ready for Service 1. Check points before Service:
User Manual SmartCell Repeater a. Verification of system installation:
- Electricity, In/Out antennas, cable connections, and equipment mounting. b. Verification of system accessories:
- User should check all necessary accessories. c. Check received signal level:
- User should check whether environmental conditions are in accordance with system specifications to ensure the system operation will be optimized. 2. Check points after Service:
a. Check external LEDs 1) RUN: Green light ON (Off: all lights off). 2) ALARM: Green light in normal status, Red light in alarm. 3) SHUT DOWN: Green light in normal status, Red light in Shutdown. 3.1.3 Signal Strength LED Check Number of LED bars LED 1 bar LED 2 bars LED 3 bars LED 4 bars LED 5 bars Input Signal Level Less than -86dBm
-85dBm ~ -79dBm
-78dBm ~ -72dBm
-71dBm ~ -65dBm More than -64dBm Output Power Signal Level Less than +5dBm
+6dBm ~ +10dBm
+11dBm ~ +15dBm
+16dBm ~ +20dBm More than +21dBm Figure 9> Modular Repeater Front LED 4.2 Setting up the Repeater 15 User Manual SmartCell Repeater 3.2.1 Quick GUI/Configuration Use the following steps to commission the Repeater after all the cabling and antennas are fixed in place and the Repeater is supplied with proper electrical power. The repeater will need a stable Downlink RSSI input level in the range of -85dBm to -60dBm. 1. Connect your laptop to the LAN port on the repeater with a Crossover Ethernet cable. 2. Verify your laptop has all wireless connections turned off and is set to obtain an IP address automatically, or you may use a fixed IP address: 172.16.6.82, with a Subnet Mask of 255.255.255.252, no default Gateway. 3. Open web browser and enter: 172.16.6.81. 4. User name: admin. 5. Password: admin. 3.2.2 Quick Setup 1. Go to the RF Configuration page. 2. Before the Amplifier (HPA) can be turned on, set the Uplink and Downlink attenuation
(ATT) to the maximum value and click Apply. 3. Select the correct Band Block and set the ALC Downlink and Uplink Limits to the desired level and click Apply. (To adjust the Output Power, change the ALC Downlink and Uplink Limits to the desired levels). 4. To check the Repeaters status, click on the Status page. 5. To change the Repeaters gain, adjust the Uplink and Downlink attenuation in equal amounts not more than 5dB at a time and click Apply. 3.3 WebUI Ranges Table GUI Feature Range Description Downlink and Uplink Output Power Display Below 0dBm to 35dBm The output Power of the Repeater Downlink Low RF Power 2dB to 10dB Threshold for Low RF Power Downlink and Uplink Attenuation Control 0dB to 30dB Reduces Gain Internally Downlink and Uplink ALC Limit 0dBm to 33dBm Limits Output Power Downlink RSSI Display
-100dBm to -27dBm Downlink Low RSSI Downlink and Uplink AMP
-93dBm to -57dBm On/Off 16 Downlink Receive Level at Donor Antenna Port Threshold for Low RSSI High Powered Amplifier Control Gain Balance Control Gain Balance Value Shutdown Control Auto Gain Setting Auto Oscillation Control Temperature Display AMP Temperature Upper Limit Band Blocks Used/Bandwidth On/Off 0dB to 15dB On/Off On/Off On/Off 32 to 260.6 Degrees 0 to 299 Degrees Each AMP Delay Alarm Report 0 or 5 Minutes User Manual SmartCell Repeater Equalizes Uplink and Downlink Gain Subtract Uplink Gain by G/B Value Shutdown if Major Alarm is Reported Automatic Gain Setting for the Repeater Prevents Oscillation Internal Repeater Temperature Threshold for Temperature Alarm The Channel the Repeater will be using Time Delay of Reporting after Alarm is Detected 3.4 Troubleshooting In case of abnormal operation, technician should diagnose abnormality via remote access or directly connecting to repeater using Ethernet cable. If technician is required to conduct repairs due to major alarm, repeater should first be powered off, and then technician should prepare the proper measurement equipment before trying to fix the problem. 3.4.1 Simple Troubleshooting Method 1) Verify LED Status, both on external LEDs as well as internal module LEDs
- Normal operation: Green light on. Alarming: Red LED on. 2) Technician should check external and internal connectors to ensure all connections are tightly secure. These connectors should be cleaned regularly. 3) If technician thinks there is a serious problem, call technical support. 1-866-9-GST-USA (1-866-947-8872) 3.4.2 Alarm Information Alarm Name What causes this alarm Downlink Spurious emissions out of spec Downlink Output Pow er exceeds Downlink Upper Limit Downlink Har dware failure Downlink path gain is 6dB less than RSSI pl Troubleshooting Methods
* The Downlink Output Power should not exceed the m aximum composite power spec for this unit.
* If the Downlink Output Power is not exceeding the co mposite power spec for this unit, try to increase the Do wnlink Upper Limit on the RF Configuration Page.
* Add equal amounts of Uplink and Downlink attenuati on until the Downlink Output Power is less than the Do wnlink Upper Limit.
* Set the ALC Downlink Limit on the RF Configuration P age to a value lower than the Downlink Upper Limit
* By default, if the Downlink Low Output Variance is se t to 10dB, the Repeater will not report this alarm. 17 us Output Power Downlink Do nor power to o low Input RSSI from Dono r site is 8dB less than Downlink Low Input Li mit Downlink VS WR When the VSWR Ratio on the Server Port is greater than 3 : 1 Downlink Do nor power to o high Downlink Input Power is greater than -
25dBm Downlink Syn thesizer failur e Failure of the synthesizer Downlink path Downlink Int erfere power exceeded Out-
band signal is about 1 5dB greater than in-
band signal Uplink Out of band emissi ons out of sp ec Uplink Output Power e xceeds Uplink Upper L imit Uplink Power at coverage port too high Uplink Synth esizer failure
(Uplink Hard ware failure) Uplink (Down link) Softwar e failure Uplink Input Power is greater than -25dBm Failure of the synthesizer Uplink path Alarming in DFM of the amplifier unit Oscillation de tected/Low is olation Insufficient isolation is detected when the R epeater is at minimum gain User Manual SmartCell Repeater
* Increase the Downlink Low Output Variance on the R F Configuration Page.
* By default, if the RSSI Lower Limit is set to -
93dBm, the Repeater will not report this alarm.
* Decrease the Downlink Low RSSI Limit level on the R F Configuration Page.
* Increase the RSSI level into the Repeater.
* "Sweep the line" to check for loose or damaged conn ectors and/or cabling.
* If after checking the entire Server side, the VSWR ala rm still exists and the system is working fine, Disable th e alarm on the Alarm Configuration page.
* Check position of the Donor antenna.
* Add attenuator to the Donor port at the highest input power level.
* Turn OFF/ON the System by pressing ON/OFF button on the back side panel.
* Call GSTs Tech Support Team and exchange the AMP unit.
* Call GSTs Tech Support Team for further instructions.
* The Uplink Output Power should not exceed the maxi mum composite power spec for this unit.
* If the Uplink Output Power is not exceeding the comp osite power spec for this unit, try to increase the Uplink Upper Limit on the RF Configuration Page.
* Add equal amounts of Uplink and Downlink attenuati on until the Uplink Output Power is less than the Uplink Upper Limit.
* Set the ALC Uplink Limit on the RF Configuration Pag e to a value lower than the Uplink Upper Limit
* Check position of the Coverage antenna.
* Add attenuator to the coverage port or use another d evice to regulate Uplink output power.
* Turn OFF/ON the System by pressing ON/OFF button on the back side panel.
* Call to GSTs Tech Support Team and exchange the A MP unit.
* Turn OFF/ON the System by pressing ON/OFF button on the back side panel.
* Call to GSTs Tech Support Team and exchange the A MP unit.
* Verify that the Donor antenna is on the same side of the building as the Donor site, and if needed, raise the Donor antenna up on a pole.
* Change the types of antennas used, such as Yagi to Corner-
Reflector for outdoors, and Omni to a Panel for indoor 18 Field Replace able module failure Tamper Dete cted Communicati on Failure Power Suppl y out of rang e Over Temper ature Reset alarm Manual Shut down FAN Mismatch of AMP unit and filter service in DF M Change of mounting i nformation in the Syst em Bad connection of NM S board and AMP unit The internal Power Su pply detects improper Voltage Internal AMP tempera ture exceeds the Tem perature Limit During reset of the un it, During the shutdown algorithm after re-
check the system is co mpletely shut downed
. FAN Failure User Manual SmartCell Repeater use.
* Move the closest indoor service antenna farther away from the outside Donor antenna.
* Close the repeater door if opened and verify that the closest indoor coverage antenna is not in the same roo m as the repeater.
* Call GST's Tech Support Team to verify all the setting s are correct.
* Wait 5 minutes to clear alarm automatically.
* If you want to disable, you can on the Alarm Configur ation page.
* SNMP board or AMP unit need to reset.
* Open the rear cover and check the each cable.
* If the system is working fine, disable the alarm on th e Alarm Configuration page.
* Call to GST's Tech Support Team to verify that all the settings are correct.
* Verify the Temperature Limit is set between 176 F ~
201 F on the RF Configuration page. (Default Value is 163F)
* Wait 30 seconds to clear alarm automatically.
* Turn OFF/ON the System by pressing ON/OFF button on the back side panel.
* Reset AMP unit in WebUI.
* Replace FAN. 19 3.4.3 Troubleshooting Guide Related to RF User Manual SmartCell Repeater Item Check Point Check before system operation System input power range System gain
(DL/UL) Output power at server port Check points before open for service Check after system operation Check points after open for service Troubleshooting
-Downlink: -100dBm ~ -27dBm
-Uplink: -100dBm ~ -27dBm
- 60dB ~ 90dB
- Downlink: 33dBm 2dB
- Uplink: 33dBm 2dB
-Please check quantity of all accessories with specification before you set up
-Fit cable length in accordance with field condition Check following status;
-Verify the antennas are securely mounted and pointed in the correct directions
-Connection status between antennas and RF cable
-Verify the Repeater is securely mounted
-Proper AC power status
-Grounding status of electrical circuit
-Coaxial cable (RF) construction status
-Connectors and combiners connection status
-Cable connection status against leakage of water When repeater does not work properly Check electricity cord connection status
-Re-plug in Adapter cord DL VSWR alarm DL over-output alarm UL over-output alarm Temperature alarm When in alarming RF off When output power is no longer Technician should verify category of alarm at the front side of repeater Check following status;
-Make sure Server Antenna Port is disconnected.
-Reset Adapter upon completing Alarm troubleshooting
-Make sure output power is operating normally
-Reset Adapter upon completing Alarm troubleshooting
-Make sure output level is operating normally
-Reset Adapter upon completing Alarm troubleshooting Check following status;
-Setting level of maximum temperature limit
-Temperature offset is normal or not
-Circumstances of temperature
-Reset Adapter upon completing Alarm troubleshooting
-Verify the HPAs are On
-Reset Adapter upon completing Alarm troubleshooting
-Red light on the Shutdown LED, technician should troubleshoot the alarm via Notebook computer 20 User Manual SmartCell Repeater
-Reconnect the connector
-Change it if the connector is defective
-Increase output power or check input change of BTS side
-If the Gain is different from normal level, please contact GSTs Technical Support
-It is possible for connectors to get too tight and damage the equipment or throughput
-Contact installer or service provider
-Increase output power level of repeater by adjusting attenuation level
-Increase output level of Uplink signal, then set to optimal level.
-Technician should connect antenna with output port of repeater
-Make sure all connectors are fastened Check the input level Check gain of the unit Cable connector loose Check input signal strength in the service area If input signal strength is not a problem, please check delay of calling time Check RSSI signal strength
-Contact network management team or service provider Check connection fastened between antenna and cable
(Signal wavelength should be flat and stable if technicians shake CABLE. If not, it is connection problem)
-If connection is not proper, reconnect cable and connector and then check the output power again Input level change or module overheating Please check VSWR of the cable is normal
-Check input level from BTS side.
-Check performance of each module (Diagnosed by GSTs Technical Supportm)
-Change to normal Cable 21 problem In case of dropped call or bad signal after set up In case output Signal wavelength is not shown flat or looks like oscillation User Manual SmartCell Repeater 3.4.4 Troubleshooting Guide Related to NMS Symptom Check Points Troubleshooting Link Fail Communication problem CLI connection, cable status check CLI connection Check by USB to serial cable
-In case of Ethernet, verify IP addressing, DHCP function, and that cookies are deleted
-Verify that a crossover Ethernet cable is being used
-Make sure 1:1 connection
-Follow instructions in the installation guide for this connection procedure
-Verify port number of PC communication
-Check cable connection status If technician thinks there is a serious problem, call GSTs Technical support. 1-866-9-GST-USA (1-866-947-8872). 22 MPE Information Warning: Exposure to Radio Frequency Radiation The radiated output power of this device is far below the FCC radio frequency exposure limits. Nevertheless, the device should be used in such a manner that the potential for human contact during normal operation is minimized. In order to avoid the possibility of exceeding the FCC radio frequency exposure limits, human proximity to the antenna should not be less than 50 cm during normal operation. The gain of the antenna is 8.0 dBi.The antenna(s) used for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. SAMSUNG Electronics Co., Ltd.