FCC ID: VQL5808 Unlicensed 5.8 GHz Point to Point Microwave Radio

ROI-$04821 -061 E 1. GENERAL APPENDIX APPENDIX RADIO FREQUENCY ALLOCATION FOR 5.8 GHz 15/28/50 MB DIGITAL RADI

This Appendix provides 5.8 GHz radio frequency band for use by each sub band as follows:

Table A-1 SUB BAND A for 15 MB System

(FCC Part101-Bandwidth 3.75 MHz) Note: TX/RX frequency spacing: 77 MHz Channel separation in 5 MHz Table A-2 SUB BAND A for 28 MB System

(FCC Parti01-Bandwidth 5 MHz) Note: TX/RX frequency spacing: 77 MHz Channel separation in 3 MHz Table A-3 SUB BAND A for 50 MB System

(FCC Part101-Bandwidth 10 MHz) Note: TX/RX frequency spacing. 77 MHz Channel separation in 10 MHz Table A-4 SUB BAND B for 15 MB System

(FCC Part101-Bandwidth 3.75 MHz) Note: TX/RX frequency spacing: 77 MHz Channel separation in 5 MHz At ROI-S04820 -051 E : APPENDIX Table A-5 SUB BAND A for 28 MB System

(FCC Part101-Bandwidth 5 MHz) Note: TX/RX frequency spacing: 77 MHz Channel separation in 5 MHz Table A-6 SUB BAND A for 50 MB System

(FCC Part101-Bandwidth 10 MHz) Note: TX/RX frequency spacing: 77 MHz Channel separation in 10 MHz Caution: It is recommended that you connect the IDU to ODU after the TX/RX frequency setting has been set on the IDU. A-2 2 pages APPENDIX ROI-S04821 Table A-1 5.8 GHz Band, Radio Frequency Allocation (SUB BAND A)

(FCC Part101-Bandwidth 3.75 MHz) CH Separation 5 MHz Bandwidth 3.75 MHz for 16 MB System Shift Freq 77 MHz Low Band | High Band SUB | | SUB BAND BAND 1 RX CH 1X RX A nya | 5730-000 to 5749.000 [5807.00 to 5826.00 MHz} Nia _|8807.000 to 5826.00 MHz in] 570.000 to $749,000 MHz in MHz in 125 KHz Steps in 125 KHz Steps 125 KHz Steps 125 KHz Steps. Table A-2 5.8 GHz Band, Radio Frequency Allocation (SUB BAND A)

(FCC Part101-Bandwidth 5 MHz) CH Separation 5 MHz Bandwidth 5 MHz for 28 MB System Shift Freq 77 MHz Low Band High Band SUB | SUB BAND BAND CH TX RX CH TX RX A Nia | 5730.00 to 5749.000 [5807.00 to 826.000 MHz} Nya [5807.00 to $826.00 MHz in| 5730.000 to 5749.000 MHz in MHz in 125 KHz Steps in 125 KHz Steps 125 KHz Steps 125 KHz Steps AS Table A-3 5.8 GHz Band, Radio Frequency Allocation (SUB BAND A)

(FCC Part101-Bandwidth 10 MHz) CH Separation 10 MHz Bandwidth 10 MHz for 50 MB System Shift Freq 77 MHz Low Band | High Band SUB suB BAND BAND cH RX cH TX RX A nya | 5730-000 to 5749.000 [5807.000 to 5826.000 MHz, Nya |8807.000 to 5826.00 MHz in] 570.000 to 5749.00 MHz in MHz in 125 KHz Steps in 125 KHz Steps 425 KHz Steps 125 KHz Steps Table A-4 5.8 GHz Band, Radio Frequency Allocation (SUB BAND B)

(FCC Part101-Bandwidth 3.75 MHz) CH Separation 5 MHz Bandwidth 3.75 MHz for 15 MB System Shift Freq 77 MHz Low Band | High Band SUB SUB BAND BAND CH 1X RX cH IX RX 8 Nia | 5749.00 to $773,000 [5826.00 to 5845.00 MHz} na |8826.000 to $845,000 MHz in] 574.000 to 5773.00 MHz in Mhz in 125 KHz Steps in 125 KHz Steps 125 KHz Steps 125 KHz Steps A-4 2 pages Table A-5 5.8 GHz Band, Radio Frequency Allocation (SUB BAND A)

(FCC Part101-Bandwidth 5 MHz) CH Separation 5 MHz Bandwidth 5 MHz for 28 MB System Shift Freq 77 MHz Low Band | High Band suB SUB BAND BAND cH 1 RX cH 1 RX B nia | 5748.00 to 5773.000 [6826.00 to 5845.000 MHz, na (9826.000 to 845.000 MHz in| 5749.000 to 773.000 MHz in Mhz in 125 KHz Steps in 125 KHz Steps 125 KHz Steps 128 KHz Steps Table A-6 5.8 GHz Band, Radio Frequency Allocation (SUB BAND A)

(FCC Part101-Bandwidth 10 MHz) CH Separation 10 MHz Bandwidth 10 MHz for 50 MB System Shift Freq 77 MHz Low Band | High Band SUB suB BAND BAND cH RX x RX B NA | 3748.00 to 573.000 [6826.00 to 5848.000 MHz} Nia (5826.00 to 845.000 MHz in| 5749.00 to 5773.00 MHz in MHz in 125 KHz Steps in 125 KHz Steps 425 KHz Steps 425 KHz Steps A-5 2 pages

ROI-S04845-051 E October, 2003 APPENDIX APPENDIX MEASUREMENT PROCEDURE FOR 5.8 GH z 15/28/50 MB NLite L DIGITAL RADIO SYSTEM

(1+0 SYSTEM) 1. GENERAL This Appendix provides instructions for measuring transmit radio frequency (RF), transmit RF output power, RF occupied bandwidth and bit error rate (

BER) at each station after the system line-up has been completed. These measurements are optional, so they do not appear in the annual maintenance schedule. 2. PRECAUTIONS The follow ing precautions must be carefully observed during maintenance. Danger:

Caution:

Caution:

The -43 V DC power is superimposed on the center conductor of the coaxial cable between the MDP and TRP. Connecting a measurement set directly to this port may damage the test equipment and touching the coaxial cable core may cause electrical shock, So, turn off the power switch on the MDP before disconnecting coaxial cable between the MDP and TRP. To protect the internal circuits against electrostatic discharge, engineers are requested to wear a wrist band and connect it to the ground (G) terminal for Electrostatic Protection (ESP) before detaching the top cover (see Fig. A-1). Do not turn on the power of the MDP leaving cable connection between the PC and LCT PORT of the MDP. After all operation for maintenance have been completed, perform MAINT OFF setting. Caution: It is recommended that you connect the MDP to TRP after the TX/RX frequency setting has been set on the MDP. APPENDIX A-2 ROI-S04845 FRONT VIEW FOR 1+0 SYSTEM MDP Fig. A-1 Location of Electro Static Protection Terminal

Before beginning measurement, notify the opposite station that measurement is about to begin. During measurements, service will be interrupted. After equipment start-up, allow the equipment to warm up for at least 30 minutes. After completing the measurement, restore all connections to normal. Before disconnecting the waveguide, connector or antenna from the RF IN/OUT of the TRP, turn off the PWR switch on the MDP or set TRP to TX mute condition (this control is performed by PC as shown in the following procedure). During measurement, the MDP and TRP are set to maintenance ON condition using a PC as shown in following procedure. ROI-S04845 APPENDIX 3. TEST EQUIPMENT AND ACCESSORIES The test equipment and special accessories listed in Table 1 are required for system maintenance. If recommended test equipment and accessories are not available, equivalents may be used. Table A-1 Test Equipment and Accessories Required TEST EQUIPMENT/ACCESSORY TYPE/ORDERING CODE Frequency Counter HP 53152A Spectrum Analyzer HP 8564EC Power Meter HP E4418B Power Sensor HP 8487A BER Test Set HP E7580A OW/RX LEV Monitor* and Headset Personal Computer (PC) *

Screwdriver Note: 1. * The OW/RX LEV Monitor operates on a dry battery (6F22/

9V). When the OW/RX LEV Monitor will not be used for a long period, remove the battery to avoid damage from battery leakage and corrosion. A-3 APPENDIX 3.1 LCT Connection A-<4 MDP SIDE LCT LCT CONNECTOR SIGNAL 4 PIN PIN "SIGNAL:

NAME No. | No NAME :

cTs a + 8 RTS :

RTS 7 cis :

DIR 6 DIR :

GND Bt OS GND :

DSR 4 tt DSR |

TXD 305 3 RXD RXD 24 2 TXD |

pep t= 4 cD D-SUB CONNECTOR MODULAR CONNECTOR

(9 Pins) Fig. A-2 RS-232C Cable Pin Assignment RS-232C. CABLE Fig. A-3 LCT Setup RO!-S04845 RO!-S04845 APPENDIX The communication/serial port settings of the personal computer used as local craft terminal (LCT) is listed below. Bits per second:

Data bits:

Parity:

Stop bits:

Flow control:

Emulation:

Transmission:

(ASCII Sending)*

Receiving:

(ASCII Receiving)*

19200 8 None 1 Hardware VT100 Video Terminal Add CR at end of line : No

(Send line ends with line feeds:No)*

Local echo : No

(Echo typed characters locally : No)*

CR: No

(Append line feeds to incoming line ends

: No)*

Return on the right edge: Yes

(Wrap lines that exceed terminal width

: Yes)*

Force incoming data to 7-bit ASCII: No

* Windows HyperTerminal settings. Microsoft and Windows are either registered trademark of Microsoft Corporation in the United States and other countries. These display screens are shown in Fig. A-4. Notes:1. For operating the LCT properly, do not use the arrow keys _, T etc. (as generates the ESC code). 2. The operation check by HyperTerminal attached to Windows is performed by Windows 95/98. When using the HyperTerminal mode of Windows 2000 or other Windows operating system, the characters may not be displayed correctly. AS APPENDIX ROI-S04845 The cable connector pin assignments are shown in Fig. A-2, The length of the RS-232C cable between the personal computer and MDP should be less than 15 m. ere me Note: Please refer to the above screenshots as an example for the HyperTerminal Setting. A-6 ROI-S04845 APPENDIX 4. MEASUREMENT PROCEDURE The general procedures for Loop back, transmit radio frequency (RF), transmit RF output power, RF occupied bandwidth and BER measurement are described below. E (8) (8) (7) (8) (2) POWER pe OS Ba Boece 3 rae |

@l Iie)

. o = Me 0 con 4 COUNTER

(REAR VIEW) TRP : (9) SPECTRUM

~-O-"1 anatyzer | @

(CONN 3) TEST EQUIPMENT REMARKS Power Meter Power Sensor Frequency Counter Spectrum Analyzer WG Adapter For 10-38 GHz band only Transducer For 10-38 GHz band only RF cable Attenuator (20 dB) Adaptor Fig. A-4 Transmit Radio Frequency, Transmit RF Output Power and RF Occupied Bandwidth Measurements Setup APPENDIX ROI-S04845 4.1 Maintenance Mode A-8 Procedure Step Procedure 1 Connect the PC to the LCT PORT of the MDP using an RS-232C cable as shown in Fig. A-3, 2 Tur on the power switch on the PC. Then, start the communication software (e.g. HyperTerminal), 3 Access Login name Admin and enter valid password, Login : Admin Password ; ********

~- NEC PDH RADIO VER. X.XX.XX --

0, Logout 1. Alarm / Status 2. Performance Monitor 3, Provisioning Data 4, System Configuration 5. Inventory Data 6. Relay / House Keeping 7, Maintenance Enter Selection : 7 4 Press the 7 key for Maintenance and press the Enter key,

--- Maintenance ~~

1. MAINT Mode (OFF) 2, Control 3, Reset CPU 4. Set Calendar 5. Password Setting 6. Program Download Enter Selection : 7 5 Press the 1 key and Enter key,

- MAINT Mode -

4. On 2. Off Enter Selection : 7 ROI-S04845 APPENDIX Procedure Step Procedure 6 Press the 1 key and Enter key,

-~- Maintenance ---

1. MAINT Mode (ON) 2. Control 3. Reset CPU 4. Set Calendar 5. Password Setting 6. Program Download Enter Selection 7 Check that the MAINT Mode turns to ON, 4.2 Transmit Radio Frequency Measurement

(a) Test Setup and Accessories Required See Fig. A-4 (CONN 1).

(b) Procedure Step Procedure Caution: During measurement, service will be interrupted. 1 Set up as shown in Fig. A-4 (CONN 1), 2 Connect the PC to the LCT PORT of the MDP, 3 Turn on the power switch on the PC. Then, start up the communication software (e.g., HyperTerminal), 4 Set the MAINT Mode to ON (refer to para. 4.1), 5 Press the 2 key and Enter key, the following appears,

- Control 1. RF Frequency ATPC Manual Control TX Mute cw IF Loopback Main Signal Loopback (Near End)

. Main Signal Loopback (Far End) 41. Antenna Alignment Mode 16. LAN Device Reset Enter Selection :

Notes: item 2 ATPC Manual Control is not displayed in MTPC mode. DONDPN AS APPENDIX A-10 ROI-S04845 Procedure Step Procedure 6 Press the 6 key and Enter key on the Control menu, the following Modulation carrier on/off item is displayed, CW 41. On 2. Off Enter Selection : 7 This will affect the radio link connection. Are You Sure ? (Y/N):

Success !!

7 Press the 1 key and Enter key, press the Y key and Enter key, then, unmodulated signal is transmitted, 8 Check that the set up is as shown in Fig. A-4 (CONN 1), 9 Measure transmit radio frequency with the frequency counter, Requirement:

10 ppm of assigned radio frequency 10 Disconnect frequency counter from RF IN/OUT terminal, 11 Press the 6 key and Enter key, 12 Press the 2 key and Enter key, and press the Y key, Enter key,

=Cw 4. On 2. Off Enter Selection : 2 This will affect the radio link connection. Are You Sure ? (Y/N): Y Success !!

13 Continue next measuring item, if not, restore all connections and reset the settings to normal. ROI-S04845 APPENDIX 4.3 Transmit RF Output Power Measurement

(a) Test Setup and Accessories Required See Fig. A-4 (CONN 2)

(b) Procedure Step Procedure Caution: During measurement, service will be interrupted. 1 Set up as in Fig. A-4 (CONN 2), Connect the PC to the LCT PORT of the MDP (see Fig. A-3), Set the MAINT Mode to ON on the PC (refer to para 4.1), bh WwW Ww Press the 2 key and Enter key to display the Control menu on the PC, 5 Press the 2 key and Enter key for ATPC Manual Control,

~-- ATPC Manual Control ---

4. Manual 2. Auto Enter Selection : 7

~ ATPC Manual Control ---

ATPC Manual PWR (MIN to MAX [dB]) Enter Selection : 0 This will affect the radio link connection. Are You Sure ? (YIN):

Success !!

6 Press the 1 key and Enter key, 7 Press the 0 key and Enter key to set the 0 dB attenuation, 8 Press the Y key and Enter key, 9 Measure transmit RF output power using the power meter, Requirement:

* 10.5 GHz Band: +21 dBm +1.5 dB 10 Disconnect power meter from the RF IN/OUT terminal. il Continue next measuring item, if not, restore all connections and reset the settings to normal. A-11 APPENDIX ROI-S04845 4.4 RF Occupied Bandwidth Measurement

(a) Test Setup and Accessories Required See Fig A-4 (CONN 3)

(b) Procedure Step Procedure Caution: During measurement, service will be interrupted. 1 Set up as in Fig. A-4 (CONN 3), 2 Set functions of the spectrum analyzer as follows:

* Bandwidth: 30 kHz (for 8 x 1.5 MB) 100 kHz (for 16 x 1.5 MB)

* Vertical: 10 dB/div

* Horizontal: 5 MHz/div

* Frequency: Assigned transmit radio frequency 3 Connect the PC to the LCT PORT of the MDP (see Fig. A-3 CONN 3), 4 Set the MAINT Mode to ON (refer to para, 4.1), 5 Press the 2 key and Enter key to display the Control menu

(refer to para. 4.3), 6 Press the 2 key and Enter key for ATPC Manual Control item (refer to para. 4.3), 7 Set the ATPC Manual PWR in ATPC Manual Control to 0 dB

(refer to para, 4,3), 8 Press the 6 key and Enter key for CW item, 9 Press the 1 key and Enter key to set the CW to ON, CW 4. On 2. Off Enter Selection: 7 This will affect the radio ink connection. Are You Sure ? (Y/N): Y Success {!

A-12 ROI-S04845 APPENDIX Step Procedure 10 Press the Y key and Enter key, i Set the appearance of carrier to the centre by turning frequency dial on the spectrum analyzer, 12 Adjust reference level dial on spectrum analyzer so that the CW signal level is set to 0 dB, 13 Repeat Step 5 to 8, and press the 2 key and Enter key to set the CW to OFF, 14 Confirm that the displayed spectrum on the spectrum analyzer is within the specified as shown in Fig. A-5, 15 Disconnect spectrum analyzer from RF IN/OUT terminal, restore RF connection to normal and reset the settings to normal. A-13 APPENDIX ROI-S04845

. (For 3.75 MHz Separation) ....... SPECTRAL POWER DENSITY (dB)

+4875 42.31 43.72

+2 +4 +6 +8 +10 FREQUENCY FROM NOMINAL CARRIER FREQUENCY (MHz) 20 bone (For 5 MHz Separation) SPECTRAL POWER DENSITY (dB) 42.5 +4,88 9 4274344 +6 +8 +10 +12 +14 +15 FREQUENCY FROM NOMINAL CARRIER FREQUENCY (MHz) Fig. A-5 Limits of Spectral Power Density A-14 ROI-S04845 APPENDIX 5. BER MEASUREMENT Perform BER measurement for 1.5 MB main channel in FE loop back between two stations. (BER measurement can not be performed on channels which are assigned to LAN signal.) 5.1 8/16 x 1.5 MB System

(a) Test Setup and Accessories Required See Fig, A-5.

(b) Procedure Step Procedure Caution: During measurement, service will be interrupted. 1 2 7 Set up the measuring circuit as shown in Fig. A-6, At station A, set the output and input signal mode of the BER test set (SSENDING/RECEIVING UNIT) as follows:

+ Bit rate: 1.544 Mbps (ANSI T1. 102)

* Code format: B8ZS or AMI Code

* Impedance: 100 ohms, balanced At station A, comnect the PC to the LCT of the MDP (see Fig. A-3), Set the MAINT Mode to ON (refer to para. 4.1), Press the 2 key and Enter key on the Maintenance menu to display Control items, Press the 9 key and Enter key for Main Signal Loopback

(Far End), Press the 1 key and Enter key, Enter Selection : 9

- Main Signal Loopback (Far End) -

41. Selected CH Loopback 2. All CH Loopback Off Enter Selection: 7 A-15 APPENDIX ROI-S04845 Step Procedure 8 Press the channel number you want and Enter key, then, the following appears,

-~- Main Signal Loopback (Far End) ---

Loopback Status {CH01-08) : -

(CHO9-16) :

CH Select (CHO1-16}: 5 Notes: 1. - indication signifies control off condition. 2. * indication signifies control on condition 3. # indication signifies restricted channel condition. 4. In case the FE loop back control has been applied from the opposite station, the Z is displayed. 5. The FE loop back control is unavailable for the channel which is inhibited by not used channel alarm.

--- Main Signal Loopback (Far End) ~~

4.0n 2. Off Enter Selection: 7 This will affect the radio link connection. Are You Sure ? (Y/N):

Success |!

9 Press the 1 key and Enter key to perform loop back function, 10 Press the Y key and Enter key, 11 The associated channel at opposite station will be in loop back,

~~ Main Signal Loopback (Far End) --

Loopback Status (CHO1-08) : ----*---

(CHO9-16) :

CH Select (CHO1-16): 5 12 Measure BER at each channel for 10 minutes to verify that it is indicated No Error, 13 Press the corresponding channel number and Enter key, 14 Press the 0 key and Enter key to restore loop back function, 15 Restore all connections to normal, 16 Restore the settings to normal. A-16 APPENDIX ROI-S04845

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(This page is intentionally left blank.) A-18 18 pages

ROI-S04824-051E 031020 CONTENTS 5.8 GHz 15/28/50 MB PDH DIGITAL MICROWAVE RADIO SYSTEM NLite L

(PDH 1+0/1+1 SYSTEM) SECTION IV MAINTENANCE 3.1 3.2 3.3 4. 41 4.2 4.2.4 4.2.2 4.3 CONTENTS TITLE PAGE GENERAL orecscsssccessnsccescoscnssessvccccnnnasscssssnensoenssesse 4-7 PRECAUTIONS ovsssssesssosesesncsecccssnssccsssecnsensesscsscess 2-4 Chart 2-1 Maintenance Mode Setting ssssssesssssescess 2-3 PREVENTIVE MAINTENANCE -ssovsescssesonnsesseseosss 3-4 Test Sets and Accessories sesseesscssssscssnccescocsnesssess 3-4 LCT Maintenance Mode *eesscrsescsssesccssscensescossecccnsees 3-2 Chart 3-1 Maintenance Mode Setting svsrsssseerseenes 3-2 Performance Monitoringssscssssecsseene: sorconecs 3u4 Chart 3-2 Performance Monitoring ssssssssseesseeseee 3-4 CORRECTIVE MAINTENANCE orscesesossonesensescscsnse 4.4 Fault Location cecccssssssessccscssnenessoosevvenssessscsssvsosecss 4-4 Chart 4-1 Alarm and Status Monitoring s+ss+s+ 4.5 4-11 Chart 4-3 Loopback Control Setting ssscrrseesesseses 4-43 Replacement seecssssesesesecsccsesenssssncnnensscsssonssenseses 4-20 MDP Replacement rsrsrrseceessecsscoonceneeseess: 4-20 Chart 4-4 MDP Unit Replacementercsrssssseessssennes 4-20 TRP Replacement erresseseecsccssesnesscenscvesenenseszessseoes 4-23 Chart 4-5 TRP Replacementersessesssceesersesecenccses 4.24 Alignment-csvcvosessoscsssovenenesssssnsnsscscsscnscocsnecsessnces 4.29 Chart 4-6 System Configuration Setting sores 4-30 Chart 4-7 Date and Time Setting sevrrssrsesscessevee 4.34 Chart 4-8 Inventory Data Monitoringesceesssssessseee 4-33 CL-1 CONTENTS ROI-S04824 TITLE PAGE 5. CHANGING PASSWORD ssovesessesosseesnseressssansesenone 51 5.1 General ssecscccesessssssrcccocensassevccesscces eocrscvesseccescenssavescoccccessnees 5a]

5.2 Procedures Chart 5-1 Changing Passwordessssssessssssenssecsscense 5-1 CL-2 2 pages CONTENTS ROI-S04824 1. GENERAL Ec SE SIE This section provides instructions for the maintenance of the 5.8 GHz 15/28/50 MB digital microwave radio system. This section provides precautions and instructions on preventive maintenance and corrective maintenance. This manual is described for the firmware version of as follows. SW UNIT: 1.0.1 MD UNIT: 1.0.2 CL3 GENERAL ROI-S04824

(This page is intentionally left blank.) 1-2 2 pages ROI-S04824 2. PRECAUTIONS PRECAUTIONS RT UA The following precautions must be carefilly observed during maintenance.

(a) The maintenance personnel should report arrival at and departure from a station to the relevant station. The following are dangers and warnings to the maintenance personnel. Warning: 1. The -43 V DC pewer is superimposed on the center conductor of the I/F cable between the MDP and the TRP. Connecting test equipment directly to this terminal may damage it and touching the coaxial cable core may cause electrical shock. 2. Persons performing servicing must take necessary steps to avoid electro-static discharge which may damage the modules on the MDP or cause error, Wear a conductive wrist strap connected to the grounded (G) jack on the front of the equipment shelf. This will minimize static build-up during servicing (see Fig. 2-1). 3. De not disconnect the I/F cable between the MDP and the TRP in operating condition, to avoid damaging the MDP and TRP. Do not remove/connect the I/F cable with the MDP power ON, turn the MDP power OFF before connecting/disconnecting the I/F cable. 4. After turning ON the equipment, wait at least 1 minute before turning it OFF again. Repeatedly turning the power ON and OFF within a short interval may cause the MDP to fail. 5. Contact NEC before program download on the LCT is performed. Equipment may not function correctly with improper operation. Caution: 1. Be careful that top surface of the MDP is considerably hot.

(b) During maintenance, the MDP should be set to maintenance

condition by the local craft terminal (LCT) (see Chart 3-1). To avoid service interruption under the maintenance, perform manual protection switching in 1+1 system. Note: When protection switching has been automatically completed during a fault, keep this condition by manual protection switching operation. First set the MAINT mode to ON before selecting the other items on the LCT maintenance menu, PRECAUTIONS 3)

(g)

(h)

RO}-S04824 Information on the maintenance and the control such as TX SW, RX SW, Mute, CW, LB, etc. is released if the power is turned off or the RESET switch is pressed. While the CPU is initialized by pressing the RESET switch, alarm(s) is in normal condition. After initialization, the alarm information is properly provided through relay contacts. Service will be interrupted instantly by pressing the RESET switch. When the contro! such as TX MUTE, CW, LB, etc. is performed, set TX SW and RX SW to the same channel certainly. If it carries out in AUTO condition, it may not operate normally. Instantaneous interruption may occur when performing the TX SW manual switching operation. Before removing or installing the MDP/TRP, turn off the power switch on the MDP. For procedures to change the password, refer to the Appendix in this section. After equipment start-up, allow the equipment to warm up at least 30 minutes. After completing maintenance, restore all connections and manual switch(es) to normal and confirm that all red alarm LEDs are unlit. FRONT VIEW FOR 1+1 SYSTEM Note: * The MD Unit No.2 is not provided for 1+0 system. MDP Fig. 2-1 Location of G Terminal RO!-S04824 RS-232C CABLE PRECAUTIONS Chart 2-1 Maintenance Mode Setting Step Procedure 1 Connect the RS-232C cable between the LCT and the MDP, Note: * The MD Unit No.2 is not provided for 1+0 system. Fig. 2-2 LCT Setup 2 Open the Terminal software (e.g; HyperTerminal), 2-3 PRECAUTIONS ROI-S04824

(This page is intentionally left blank.) 24 4 pages ROI-S04824 TEST SETS AND ACCESSORIES 3. PREVENTIVE MAINTENANCE i a This chapter provides the routine (annual) maintenance procedures to ensure the satisfactory operation of the equipment. During preventive maintenance, carefully observe the precautions given in chapter 2. 3.1 Test Sets and Accessories The test sets and special accessories listed in Table 3-1 are required for maintenance. If recommended test sets and accessories are not available, equivalents may be used. Table 3-1 Test Sets and Accessories Model Type Mode! Number Manufacture PDH Analyzer MP1550A Digital Multimeter HP34401A OW/RX LEV Monitor* X0818A Screwdriver T Type Hexagonal Driver Torque Wrench Local Craft Terminal (LCT) with RS-232C Cable Note: 1. * The OW/RX LEV Monitor operates on a dry battery (6F 22/

9V). When the OW/RX LEV Monitor will not be used for a long period, remove the battery to avoid damage from battery leakage and corrosion. TEST SETS AND ACCESSORIES ROI-S04824 3.2 LCT Maintenance Mode tt tt Chart 3-1 Maintenance Mode Setting tht th Step Procedure tt i Enter Login name Admin and the Enter key, Login : Admin Password : ********

-~ NEC PDH RADIO VER, X.XX.XX-

0, Logout 1. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5, Inventory Data 6. Relay / House Keeping 7. Maintenance Enter Selection :

2 Enter the valid password and press the Enter key, Maintenance Mode Setting 3 Press the 7 key and press the Enter key, Enter Selection : 7

~ Maintenance 4. MAINT Mode (OFF) 2. Control 3. Reset CPU 4. Set Calendar

, Password Setting 6. Program Download Enter Selection: 7

-~ MAINT Mode -

4, On 2. Off Enter Selection: 7 Maintenance --

4. MAINT Mode (ON) 2. Control 3. Reset CPU 4. Set Calendar 5, Password Setting 6. Program Download Enter Selection :

4 Press the 1 key and press the Enter key, 5 Press the 1 key and press the Enter key for Mainte mode ON, ROI-S04824 TEST SETS AND ACCESSORIES ht I Chart 3-1 Maintenance Mode Setting (Cont'd) it ttt Step Procedure Restoring to Normal Mode 6 Press the 7 key and press the Enter key, NEC PDH RADIO VER, X.XX.XX 0, Logout 4. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5, Inventory Data 6. Relay / House Keeping 7. Maintenance Enter Selection : 7

~ Maintenance 1, MAINT Mode (ON) 2. Control 3. Reset CPU 4, Set Calendar 5, Password Setting 6. Program Download Enter Selection: 7

~ MAINT Mode 4,On 2. Off Enter Selection: 2

- Maintenance --

41. MAINT Mode (OFF) 2. Control 3. Reset CPU 4. Set Calendar 5, Password Setting 6. Program Download Enter Selection :

7 Press the 1 key and press the Enter key, 8 Press the 2 key and press the Enter key for Mainte mode OFF, If any item has been controlled, an error message and controlled items are displayed. Release controlled item before Mainte mode OFF. 9 Press the ESC key to return to previous menu, 10 Press the 0 key to logout and press the Enter key, ht LR 33 TEST SETS AND ACCESSORIES ROI-S04824 3.3 Performance Monitoring 3-4 tt tt I Chart 3-2 Performance Monitoring Step Procedure tl 1 Connect the RS-232C cable between the LCT and MDP (see Fig, 2-2 in Chart 2-1), 2 Open the Terminal software (e.g; HyperTerminal), 3 Enter Login name User and press the Enter key on the LCT, Login : User NEC PDH RADIO VER. X.XX.XX 0. Logout 4, Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5. Inventory Data 6. Relay / House Keeping Enter Selection :

4 Press the 2 key for Performance Monitor and press the Enter key, ROI-S04824 TEST SETS AND ACCESSORIES ie tt tt I Chart 3-2 Performance Monitoring (Cont'd) Step Procedure ttt tt 5 Press the 1 key for Display Metering /BER and press the Enter key. Verify the ail items listed in Table 3-2.

- NEC PDH RADIO VER. X.XX.XX -

. Logout Alarm / Status Performance Monitor Provisioning Data System Configuration Inventory Data 6. Relay / House Keeping Enter Selection : 2 APRONS

~~ Performance Monitor -

1. Display Metering / BER 2. Display Performance Monitor 3. Display Threshold Data Enter Selection : 7

- Display Metering / BER ---

TX POWER +10dBm RX LEVEL -60dBm TRPPSMON -48V BER 0.0E-10 (Calculating)

- Performance Monitor -

1. Display Metering / BER 2. Display Performance Monitor 3. Display Threshold Data Enter Selection :

Notes: 1. In the 1+1 system, metering/BER values for No.1 CH is displayed in the left side and for No.2 CH is displayed in the right side. 2. 3.0E-4 indicates the bit error rate of 3 x 1 of, 3. * BER (BER between radio) is calculated every one minute. Calculating is displayed till the value is fixed. 4. *If the performance data from the TRP are not received,

**dBm and ***V are displayed. 5. TX POWER/RX LEVEL is indicated in 1 dB step. 3-5 TEST SETS AND ACCESSORIES ROI-S04824 ttt Chart 3-2 Performance Monitoring (Cont'd) tt tht Step Procedure Table 3-2 Meter Reading Check Item Normal Indication Allowable Range TX POWER. +21 to-7 dBm Normal Indication +3 dB (8 x 1.5 MB) RX LEVEL | -30 dBm* 10.5 GHz -15 to -84.0 dBm (8 x 1.5 MB) TRP PS MON 32 to-46 V DC Notes:1. If an abnormal indication appears, proceed to 4.1

(Fault Location) in this chapter. 2. *Varies in proportion to the receiving RF signal level. 3. **Varies with cable length between the MDP and TRP. 4. Record displayed indication values on the LCT. 6 Press the ESC key to go back to Main menu, and press the Enter , ttt 34 6 pages ROIN-S04824 4.1 Fault Location PREVENTIVE MAINTENANCE 4. CORRECTIVE MAINTENANCE ea Corrective maintenance done in the field is described in this chapter. Corrective maintenance in the field covers fault isolation, module/unit replacement and alignment. The fault location procedures describes how to isolate unit-level faults. Faults can be classified into those that cause deterioration of the transmission quality and those that interrupt the service due to a malfunction of the equipment. This chapter explains the troubleshooting procedures for equipment faults and the corresponding remedial methods. The purpose of troubleshooting malfunctioning equipment is to restart the service by locating the faulty part and replacing it with a spare. The faults that cause deterioration in the transmission quality are primarily originated by changes occurred in the state of propagation. Therefore, ifa decline in the transmission quality or similar fault takes place frequently, the link design will have to be reviewed. During the corrective maintenance, carefully observe the precautions given in chapter 2, until the alignment is completed. The following 3 methods are available for checking the details of a fault:

* Checking the ALM LED Indications and LCT Indication

* Meter Readings

* Loopback.

(a) Checking the ALM LED Indications and LCT Indication A faulty part can be located by checking the ALM LED indications and LCT indications. For the explanation of the ALM LED indication and LCT indication, refer to Section 2.4.1 (Alarm Indication and Reporting) of Chapter 2 in Description section. Also refer to Chart 4-1 in this Chapter.

(b) Meter Readings Based on the meter readings during periodical inspection described in Chapter 4, a faulty part can be located by checking if the reading values exceed the permissible ranges. Table 4-1 shows the correspondence between the items for which abnormal readings are detected and the faulty parts. In the case of an abnormal BER measurement result, try to locate the faulty part by next (c) Loopback. 4-1 PREVENTIVE MAINTENANCE ROI-S04824

(c) Loopback When there is an interruption of signals, use the PDH Analyzer and isolate the faulty part by checking the passage of the 1.5 MB signal by loopback. Locate the fault by using the following diagrams.

+ Fig. 4-1 Loopback Diagram for Fault Isolation Shows the section from where the signal is turned back.

* Chart 4-2 - Loopback BER Measurement

* Fig, 4-2 BER Measurement Setup

* Chart 4-3 Loopback Control Setting When maintenance such as isolating a faulty portion at the occurrence of failure and revising the software are carried out, the Control item in Maintenance is used. Enter Selection : 2

- Control ---

4, RF Frequency ATPC Manual Control TX SW Manual Control TX Mute RX SW Manual Control cw IF Loopback Main Signal Loopback (Near End)

. Main Signal Loopback (Far End) 41. Antenna Alignment Mode 16. LAN Device Reset Enter Selection :

CON AMP OP Note: Setting items displayed on the LCT depend on setting condition of System Configuration. The details of Control item are described below:

Control Control items can be selected only under maintenance mode. As this Control is likely to cause disconnection of signal, take care during operation. RF Frequency Sets the transmitting and receiving RF frequencies.

+ ATPC Manual Control Used when changing of the transmitting power is required during ATPC operation when the ATPC mode is selected in system configuration.

* TXSW Manual Control Controls manual switchover of the TX SW at the transmitting side in only the 1+1 Hot standby (HS) system. 4-2 ROI-S04824 PREVENTIVE MAINTENANCE TX Mute Turns off/disables the transmitter output. RXSW Manual Control Controls manual switchover of the RX SW in the 1+1 system. The switchover is carried out without traffic interruption. Adjustment of the delay time of No.1 and No.2 is automatically set. CW Used for outputting a clean carrier wave (CW). Used to confirm the transmitting output power and frequency stability. IF Loopback Used for localizing equipment failure to MDP or TRP. The input 1.5 MB signal from MUX is looped back at IF stage. If no abnormality is found in the signal after IF loopback, it is assumed that the TRP has a problem. Main Signal Loopback (NEAR END) Used for localizing equipment failure to MUX equipment or radio equipment. The input 1.5 MB signal from MUX is looped back and then output with 1.5 MB signal. If no abnormality is found in the signal with NEAR END loopback, it is assumed that the radio equipment (MDP or TRP) has a problem. Main Signal Loopback (FAR END) Used for localizing equipment failure to MUX equipment or radio equipment. Signal is looped back at the MDP of the opposite station. If no abnormality is found in the signal through FAR END loopback, it is assumed that the local radio equipment (MDP or TRP) has no problem. Check the Main Signal loopback (NEAR END) at the opposite station. Antenna Alignment Mode The Antenna Alignment Mode is the mode used for Antenna Orientation. This mode is used for extending the dynamic range of the RX LEVEL MONITOR. The output of RX LEV MON in TRP can be enlarged and the meter indication of the OW/RX LEV Monitor can be enlarged. In this mode, since control of TX power stops, the normal operation can not be performed. Note: The relation of the RX INPUT LEVEL and RX LEVEL MON is shown below. LAN Device Reset Used for reset control to Port 1 or Port 2, when LAN is optional provided. 43 PREVENTIVE MAINTENANCE ROI-S04824 45 RX LEVEL MON ve RX INPUT LEVEL (Typical) 35 a 25 RX LEVEL MON [VJ 15 be |

08 Condition

~70 60 50 ~a0 30 -20 RX INPUT LEVEL [dm]

Table 4-1 Fault Isolation by Meter Reading Meter Reading Fault 1X Power RX Level | TRP PS MON Isolation TRP Path propagation or TRP 44 DC-DC CONV module on MD UNIT of MDP or IF line cable*

Note: O indicates abnormal condition.

* If the IF line cable is open conditions, the TRP ALM LED on the MDP turns to flashing. ROI-S04824 PREVENTIVE MAINTENANCE tt Chart 4-1 Alarm and Status Monitoring Step Procedure ae 1 Connect the RS-232C cable between the LCT and MDP (see Fig, 2-2 in Chart 2-1), 2 Open the Terminal software (e.g; HyperTerminal), 3 Enter Login name User and press the Enter key on the LCT, Login : User

- NEC PDH RADIO VER. X.XX.XX ---

Q. Logout 4. Alarm / Status 2, Performance Monitor 3. Provisioning Data 4, System Configuration 5. inventory Data 6. Relay / House Keeping Enter Selection :

4 Press the 1 key for Alarm/Status and press the Enter key, 4-5 PREVENTIVE MAINTENANCE ROI-S04824 46 Chart 4-1 Alarm and Status Monitoring (Cont'd) tt NEC PDH RADIO VER. X.XX.XX ---

0. Logout 1. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5. Inventory Data 6. Relay / House Keeping Enter Selection : 7

-- TRP =

TX Power Normal TX Input Normal RX Leve! Normal 4 APG Normal Cable Alarm Next Data ? (Y/N): y

-- MDP MOD Alarm DEM Alarm High BER Normal 9 Low BER Normal LOF Normal MDCPU Alarm BB Linearizer OPR erssserseenee *6 Next Data ? (Y/N): y

- Main INTFC -

Los (CHO1-08) :

(CHO9-16) :

Output LOS (CHO1-08) :

{CHO9-16) :

AIS Generated (CHO1-08) : *3

(CHO9-16) : 4 AIS Received {CHO1-08) :

(CHO9-16) :

Channel Usage Error (CHO1-08) :

(CHO9-16) : --*----- es Next Data ? (YIN): y

~-- Module -~

MODEM Alarm Main INTFC Normal NEC PDH RADIO VER. X.XX.XX 0, Logout 4. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5. Inventory Data 6. Relay / House Keeping Enter Selection :

RO!-S04824 PREVENTIVE MAINTENANCE tt HS Chart 4-1 Alarm and Status Monitoring (Cont'd) an Step Procedure tt tt Notes: 1. Inthe 1+1 system, status for No. 1 CH is appeared in the left side and for No. 2 CH is appeared in the right side. 2. *1 When an Alarm indication is displayed, the TRP has a failure. 3. *2 When an Alarm indication is displayed, the MD UNIT on MDP is failure. 4. *3 In the 8 x 1.5 MB system, (CH01-08) is indicated only. 5. *3 In the 16 x 1.5 MB system, (CHO1-08) and (CHO9-16) are indicated 6. *4 When an * indication is displayed, external equipment on has a failure ( indication is normal condition). 7, * Indicates main channel interface usage error when Report has been selected for the Channel Usage Error. 8 *6 Indicates when Linearizer is controlled as follows. AUTO Control : OPR Reset Control : NO OPR Not Provided BB Linearizer: N/A 9, Alarm and status indication items should be displayed depending on system requirement. The alarm and status of each module and TRP are displayed. Each items is explained below. TX Power:

Indicates the status of the transmitter in the TRP. When the normal transmission level can not be output due to failure in the transmitter, this alarm is issued. TX Input:

Indicates the status of the modulated signal input from MDP. If the input signal from the MDP is lost, this alarm is issued. RX Level:

Indicates the status of the receiver in the TRP. If the receiving level exceeds the RX signal level requirements, this alarm is issued. 4-7 PREVENTIVE MAINTENANCE ROI-S04824 ett ttt Chart 4-1 Alarm and Status Monitoring (Cont'd) Step Procedure APC:

Indicates the status of the synthesizer in the TRP. If any abnormality occurs in the synthesizer, this alarm is issued. Cable:

Indicates the status of communication between MDP and TRP. If a communication abnormality is caused between TRP and the MDP, this alarm is issued. Note: When the IF cable is open conditions, TRP alarm indicator on the MDP turns to flashing. MOD:

Indicates the status of the modulator. If a failure occurred in the modulator and as a result of a transmitter side LSI failure, this alarm is issued. DEM:

Indicates the status of the demodulator. If a IF input loss occurred in the demodulator, this alarm is issued. High BER:

Indicates the status of quality deterioration status of the highway between radio sections. If the signal is deteriorates below the threshold value (3 x 10 fixed), this alarm is issued. Low BER:

Indicates bit error rate (BER) of the data signal. If the signal is deteriorated below the threshold values (3x10"7, fixed) alarm is issued. LOF:

Indicates the radio frame synchronization status. MDCPU:

Indicates the status of communication between the MDP modules. If any abnormality in the response of a module in the MDP has occurred, this alarm is issued. 4-8 RO!-S04824 PREVENTIVE MAINTENANCE Chart 4-1 Alarm and Status Monitoring (Cont'd) Step Procedure nt BB Linearizer:

Indicates the Linearizer control status. When the Linearizer control for the TRP corresponded to the BB Linearizer is set to AUTO mode, OPR appears, if it is reset, NO OPR appears. When the TRP is not corresponded to the BB Linearizer, N/A appears. LOS:

Indicates the input status of the 1.5 MB signal for Main INTEC. If the input is disconnected, this alarm is issued. Output LOS:

Indicates the output status of the 1.5 MB signal of Main INTFC. If the received signal from radio link is lost, this alarm is issued. AIS Generated:

Indicates the status of AIS generation for receiving channel in the Main INTFC. AIS Received:

Indicates the status of AIS RCVD signal for transmitting channel in the Main INTFC. Channel Usage Error:

Jn Main Channel Usage item of the Provisioning Data, when 1.5 MB bipolar signal is inputted into the channel which has chosen Not Used, * mark is displayed. And the MDP ALM indicator on the front of the MDP is lighted. MODEM:

Indicates the operating status of the MODEM. If failure occurs in the equipment, this alarm is issued. Main INTFC:

Indicates the operating status of Main INTFC. If failure occurs in the equipment, alarm is issued. 4-9 PREVENTIVE MAINTENANCE ROI-S04824 a ve Chart 4-1 Alarm and Status Monitoring (Cont'd) tA Step Procedure 5 Press the 0 key to logout and press the Enter key. TRANSMITTING END RECEIVING END MDP TRP TRP MDP PDH/SDH BU ANALYZER CONV PDH/ISDH UB ANALYZER: CONV CTR! MODEM Fig. 4-1 Loopback Diagram for Fault Isolation 4-10 ROI-S04824 PREVENTIVE MAINTENANCE i tt Chart 4-2 Loopback BER Measurement tt Apparatus:

PDH Analyzer Step Procedure tt 1 Disconnect the D-sub connectors from the CH1-CH8 IN/OUT or CH9-CH16 IN/OUT on the MDP (see Fig. 4-2), 2 Set the PDH Analyzer as follows:

* Bit rate : 1.544 Mbps (ANSI T1.102)

* Code format : B8ZS or AMI

* Impedance : 100 ohms, balanced 3 Set up as in Fig. 4-2, 4 Measure the BER for each channel, Requirement:1 x 107)? or less tt 4-11 PREVENTIVE MAINTENANCE Transmitting End PDH LANALYZER |

ROI-S04824 Tae DUTT ee

5 IOUT AMIR OUT. CLUSTERLALMAUXIN ae a i cn cn) Toveee WONT opirs0m0s yp AUG, a0a00 WOoe 565%

tow Ga Ger qin Hole ie 412 Receiving End PDH ANALYZER RESW CTRL PFRAPFIC IOUT, TRRFrIG OUT 8c Wout RMAUXOUT CLUSTER ALMIAGIAIN Tea MOUNT |

Par o pwr Cie TaaTeee SW UN sage AV S000 aul o Rk 2 om i# Ogos al FON CALL RESET ce ap q NEC | Miite&

oO Notes: Pin assignment of D-sub connector is referred to Table 2-1 in Section IT Operation. For 8/16 x DS1 System MDP Fig. 4-2. BER Measurement Setup ROI-S04824 PREVENTIVE MAINTENANCE tt A Chart 4-3 Loopback Control Setting This chart contains:

A. Preparation: Steps 1 to 8 B. IF Loopback Control: Steps 9 to 14 C. Main Signal Loopback (Near End) Control: Steps 15 to 22*

D. Main Signal Loopback (Far End) Control: Steps 23 to 30*

Note: * Applies to 8/16 x 1.5 MB system. Step Procedure Notes: 1. Service will be interrupted during Loopback condition. 2. Following Loopback operation is not performed simultaneously.

* IF Loopback

* Near End Loopback

* Far End Loopback 3. Loopback operation is not performed with an opposite station simultaneously. A. PREPERATION 1 Connect the RS-232C cable between the LCT and MDP (see Fig. 2-2 in Chart 2-1), 2 Open the Terminal software (eg; HyperTerminal), 3 Enter Login name Admin and press the Enter key on the LCT, Login : Admin Password : ********

- NEC PDH RADIO VER. X.XX.XX 0. Logout 1. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5, Inventory Data 6. Relay / House Keeping 7. Maintenance Enter Selection :

4-13 PREVENTIVE MAINTENANCE ROI-S04824 Chart 4-3 Loopback Control Setting (Cont'd) Step 4 5 Procedure Enter specified password and press the Enter key, Press the 7 key for Maintenance and press the Enter key, 4. 0n 2. Off Enter Selection : 7

~ Maintenance -

1, MAINT Mode (OFF) 2. Control 3. Reset CPU 4, Set Calendar 5. Password Setting 6. Program Download Enter Selection: 7

~- MAINT Mode Enter Selection: 7 Maintenance -

1. MAINT Mode (ON) 2. Control 3. Reset CPU 4. Set Calendar 5, Password Setting 6. Program Download Enter Selection :

4-14 Press the 1 key for MAINT Mode and press the Enter key, Press the 1 key for ON and press the Enter key, Press the 2 key for control and press the Enter key, B. IF LOOPBACK CONTROL Used for localization of equipment failure in the TRP or MDP. The input 1.544 Mbps signal from MUX is looped back with IF signal via INTFC and MODEM and then output with 1.544 Mbps signal

(see Fig, 4-1). Note:

ROI-S04824 PREVENTIVE MAINTENANCE Chart 4-3 Loopback Control Setting (Contd) Step Procedure ttt tt 9 Press the 7 key for IF loopback and press the Enter key, Enter Selection : 2

~ Control ~-

4. RF Frequency 2. ATPC Manual Control 4, TX Mute 6, CW 7. IF Loopback 8. Main Signal Loopback (Near End) 9, Main Signal Loopback (Far End) 41. Antenna Alignment Mode 16. LAN Device Reset Enter Selection : 7

~ IF Loopback ---

41, On 2. Off Enter Selection: 7 This will affect the radio link connection. Are You Sure ? (YIN): Y Success t!

Note: Setting items displayed on the LCT depend on setting condition of System Configuration. 10 Press the 1 key for IF Loopback ON and press the Enter key, li Press the Y key and press the Enter key, then Success !! is displayed, 12 After the Loopback test for BER, press the 7 key and press the Enter key, 13 Press the 2 key for IF Loopback OFF and press the Enter key, 14 Press the Y key and press the Enter key, then Success !! is displayed, 4-15 PREVENTIVE MAINTENANCE ROI-S04824 4-16 Chart 4-3 Loopback Control Setting (Cont'd) i Step Procedure Tn C. Main Signal LOOPBACK (NEAR END) CONTROL Note: Used for localization of equipment failure in the MUX or Radio equipment. The input 1.544 Mbps signal from MUX is looped back immediately, and then output with 1.544 Mbps signal (see Fig. 4-1). 15 Press the 8 key for Main Signal Loopback (Near End) and press the Enter key, Enter Selection : 2

- Control! -

41. RF Frequency 2. ATPC Manual Control 3. TXSW Manual Control 4. TX Mute 5, RXSW Manual Contro!

6. CW 7. IF Loopback 8. Main Signal Loopback (Near End) 9. Main Signal Loopback (Far End) 41. Antenna Alignment Mode 16. LAN Device Reset Enter Selection : &

Main Signal Loopback (Near End) --

4. Selected CH Loopback 2. All CH Loopback Off Enter Selection: 1 Main Signal Loopback (Near End) --

Loopback Status (CHO1-08) : #HHHHHEH

(CHO9-16) : #-*--*--

CH Select {CHO1-08): 75

~~ Main Signal Loopback (Near End) -

4.0n 2. Off Enter Selection: 7 This will affect the radio link connection. Are You Sure ? (Y/N):

Success {1 Notes : 1. Setting items displayed on the LCT depend on setting condition of System Configuration. 2. The status of channels are indicated below.

#; Assigned to LAN, *: loopback condition, - : Normal ROI-S04824 PREVENTIVE MAINTENANCE Sn nS Chart 4-3 Loopback Control Setting (Cont'd) Step Procedure 16 Press the 1 key for selected CH Loopback and press the Enter key, 17 Press the desired channel number key and press the Enter key, 18 Press the 1 key for ON and press the Enter key, 19 Press the Y key and press the Enter key, then Success !! is displayed, Note: In the loopback condition, * mark is indicated. 20 After the loopback control for BER, press the ESC key to return to previous menu,

- Main Signal Loopback (Near End) -

4. Selected CH Loopback 2. All CH Loopback Off Enter Selection: 2 This will affect the radio link connection. Are You Sure ? (YIN):

Success !f 21 Press the 2 key for All CH Loopback Off and press the Enter key, 22 Press the Y key and press the Enter key, then Success !! is displayed, D. Main Signal LOOPBACK (FAR END) CONTROL Note: Used for localization of equipment failure in the MUX or Radio equipment. Input 1.544 Mbps signal is looped back with INTFC of MDP at the opposite station and then output with 1.544 Mbps signal (see Fig. 4-1). 4417 PREVENTIVE MAINTENANCE ROI-S04824 4-18 Chart 4-3 Loopback Control Setting (Cont'd) Step Procedure 23 Press the 9 key for Main Signal Loopback (Far End) and press the Enter key,

~~ Control -

1. RF Frequency 2. ATPC Manual Controt 4. TX Mute 5. RXSW Manual Control 6. CW 7. IF Loopback 8. Main Signal Loopback (Near End) 9, Main Signal Loopback (Far End) 44. Antenna Alignment Mode 16. LAN Device Reset Enter Selection : 9

~- Main Signal Loopback (Far End) -

4. Selected CH Loopback 2. All CH Loopback Off Enter Selection: 7

- Main Signal Loopback (Far End) Loopback Status (CH01-08) --------

(CHO9-16) ------ Zz CH Select (01-16): 75 Main Signal Loopback (Far End) ---

4. On 2. Off Enter Selection: 7 This will affect the radio link connection. Are You Sure ? (YIN):

Success !!

Notes: 1. Indication items on LCT display should be changed according to system configuration. 2. When the loopback is controlled from opposite station, Z mark is indicated. 3.The status of channels are indicated below.

#: Assigned to LAN, *: loopback condition, - : Normal 24 Press the 1 key and press the Enter key, 25 Press the desired channel number key and press the Enter key, ROI-S04824 PREVENTIVE MAINTENANCE th th Chart 4-3 Loopback Control Setting (Cont'd) Step Procedure tt I 26 Press the 1 key for ON and press the Enter key, 27 Press the Y key and press the Enter key, then Success !! is displayed, 28 After the loopback test for BER, press the ESC key to return to previous menu,

- Main Signal Loopback (Far End) ---

1. Selected CH Loopback 2. All CH Loopback Off Enter Selection: 2 This will affect the radio link connection. Are You Sure ? (YIN):

Success {!

29 Press the 2 key for All CH Loopback Off and press the Enter key, 30 Press the Y key and press the Enter key, then Success !! is displayed, 4-19 PREVENTIVE MAINTENANCE ROI-S04824 4.2 Replacement The replacement procedures of the MDP and TRP is described below. 4.2.1 MDP Replacement 4-20 The procedures for replacing MDP with spare are given in the Chart 4-4, th I Chart 4-4 MDP Unit Replacement ttt tt Warning: Persons performing servicing must take necessary steps to avoid electro-static discharge which may damage the modules or cause error. Wear a conductive wrist strap connected to the grounded (G) jack on the front of the equipment shelf. This will minimize static build-up during servicing. (see Fig. 2-1). Warning: When replace the unit, turn off the power switch and allow some time for the unit to cool before handling the unit to be replaced. This chart contains:

A. No.1 CH MD UNIT replacement: Steps 1 to 7 B. No.2 CH MD UNIT replacement: Steps 18 and 719 C. SW UNIT replacement: Steps 20 to 28 et tt I Apparatus:

Suitable Screwdriver tt IS Step Procedure tl tN This MDP consists of three units (No. 1 CH MD UNIT/SW UNIT/No. 2 CH MD UNIT) (see Fig. 4-4). If any unit fails, replace only the unit that fails with a spare following the procedure described below. Caution: When the SW UNIT is replaced with spare, service is interrupted. Note: No.2 CH MD UNIT is not provided for 1+0 system. ROI-S04824 Step PREVENTIVE MAINTENANCE Chart 4-4 MDP Unit Replacement (Cont'd) Procedure 10 li 12 13 14 15 16 17 A. No.1 CH MD UNIT REPLACEMENT REMOVING Referring to Chart 2-1, set maintenance mode to maintenance ON position by LCT, Perform the protection switching to protect the system in 1+1 system, Turn off the power switch on the No. 1 CH MD UNIT (see Fig, 4-3), Disconnect the power cable from the SEL V connector on the No.1 CH MD UNIT, Disconnect the IF cable from the IF IN/OUT connector on the No. 1 CH MD UNIT, Disconnect the frame ground cable from the FG terminal, Loosen two screws on the No. 1 CH MD UNIT, To remove the MD UNIT, hold two screws then pull it forward, REMOUNTING Place a new MD UNIT at the location for mounting, then push along the guide rail until the multi-pin connector exactly fits, Tighten two screws on the MD UNIT (see Fig. 4-3), Reconnect IF cable to IF IN/OUT connector, Reconnect power cable to SEL V connector, Reconnect frame ground cable to FG terminal, Turn on the power switch, Reset the protection switching to Auto mode in 1+1 system, Confirm that the all alarm LED are OFF, Referring to Chart 2-1, reset maintenance mode to maintenance OFF position, 4-21 PREVENTIVE MAINTENANCE ROI-S04824 Chart 4-4 MDP Unit Replacement (Cont'd) Step Procedure B. No. 2 CH MD UNIT REPLACEMENT REMOVING 18 Repeat steps 1 to 7 for No.2 CH MD UNIT, REMOUNING 19 Repeat steps 8 to 14 for No.2 CH MD UNIT, C. SW UNIT REPLACEMENT REMOVING Note: When replacing SW UNIT with spare, replace quickly to minimize service interruption. 20 Before removing the SW UNIT from the MDP, mark corresponding terminal name for all cables connected to the SW UNIT, 21 Turn off the power switch on the No.1 CH MD UNIT, (see Fig. 4-3), 22 Turn off the power switch on the No.2 CH MD UNIT, 23 Disconnect all cables from connectors on the MDP, 24 Disconnect ground cable from the FG terminal. 25 Loosen two screws on the SW UNIT, 26 To remove the SW UNIT, hold two screws then pull it forward, REMOUNTING 27 Place a new SW UNIT at the location for mounting, then push along the guide rail until the multi-pin connector exactly fits, 28 Tighten two screws on the SW UNIT (see Fig. 4-3), 29 Reconnect ground cable to FG terminal, 30 Recomnect correctly ail cables removed in step 19, 31 Turn on the power switches on the No.1 and No.2 CH MD UNIT. ne tl tt 4-22 RO#-S04824 PREVENTIVE MAINTENANCE No.1 CH SEL V No. 1 PWRx_~ SCREW Sen Oo PRAT LOT cow EW? to TRAFFIC RIGUT ny) TOTES SWNT oO |Me@)aood se our Mueee cusren BOE want, Oo ioe) CS, Ce og, 888%

oO = o Z Coke No. 2 PWR SCREW 7 SWUNIT No.2 CH SELV No.2 CH MD UNIT SCREW Note: Other portions are the same as the equipment for 8 x DSI system. FOR 16 x DS1 SYSTEM MDP Fig. 4-3 Screw, Connector and Switch Location 4.2.2 TRP Replacement The procedures for replacing the TRP with a spare are given in Chart 4-5. The label attached to the side of TRP indicates the TRP type (see Fig 4-3). To replace the TRP, prepare another TRP of the same type as indicated on the label of the failed one (see Appendix in Description section). Nite L TRP-( )G-2AA, Hosea:

OUTDOOR UNIT (SHG) SHIFT FREQ, 65MHE TX FREQ. highiiow SERIAL No., DATE WEIGHT 4 Skg43V ===0.5A, NEC nec corporation MADE IN JAPAN 40.5 GHz Band TRP Fig. 4-4 TRP Type and Frequency Indication Label 4-23 PREVENTIVE MAINTENANCE ROI-S04824 tt tt NIH Chart 4-5 TRP Replacement Step Procedure 10.5 GHz BAND TRP REMOVING 1 Tum off the power switch on the associated MDP, Caution: Do not remove the IF line cable before turn OF F the power switch on the MDP. 2 Remove the self-bonding tape from the IF IN/OUT connector, 3 Disconnect the IF cable from the IF IN/OUT connector on the TRP, 4 Disconnect ground cable from the FG terminal on the TRP, 5 Loosen the four bolts fixing the TRP with a T type hexagonal driver, SCREWS SCREWS 6 Remove the TRP from the bracket with both hands, 4-24 ROI-S04824 PREVENTIVE MAINTENANCE i tl I Chart 4-5 TRP Replacement (Cont'd) i Step Procedure MOUNTING 7 When vertical polarization is required, rotate the TRP so that the plate marked V turns to top, Note: Remove the protection metallic plate covering the waveguide hole on the TRP. 8 When horizontal polarization is required, remove the guide pin fixed on the plate marked V. GUIDE PIN PLATE MARKED V 9 Insert the guide pin removed in previous step behind of the plate marked H. 10 Rotate the TRP so that the plate marked H turns to top. 4-25 PREVENTIVE MAINTENANCE ROI-S04824 Chart 4-5 TRP Replacement (Cont'd) Step Procedure GUIDE PIN PLATE MARKED H PLATE MARKED V PLATE MARKED H V POLARIZATION H POLARIZATION V/H Polarization Conversion il Put the spare TRP onto the bracket, Note: Be careful not to damage the flange. 4-26 ROI-S04824 PREVENTIVE MAINTENANCE Chart 4-5 TRP Replacement (Cont'd) Step Procedure it 12 Mount the spare TRP onto the bracket, and tighten the four screws on the TRP, SCREWS TRP SCREWS 13 Reconnect the IF cable to the IF IN/OUT connector on the TRP, 4-27 PREVENTIVE MAINTENANCE ROI-S04824 4-28 TRP IF CABLE IF CABLE Chart 4-5 TRP Replacement (Contd) Step Procedure 14 Wrap the IF IN/OUT connector with self-bonding tape for waterproofing. This part should be wrapped by self-bonding tape for waterproofing. IFL CONNECTOR TRP SELF-BONDING TAPE SELF-BONDING TAPE IN CASE OF "L ANGLE Note: The self-bonding tape should be prepared by the customer. 15 Reconnect ground cable to FG terminal, 16 Turn on the power switch on the MDP. ROI-S04824 4.3 Alignment Equipment PREVENTIVE MAINTENANCE After replacing the unit with spares, the equipment must be aligned as listed in Table 4-2. The inventory information of each module in the equipment is displayed as shown in Chart 4-8. Replaced Module/Unit Table 4-2 Equipment Alignment Alignment Item System Configuration Setting Reference Procedure Chart 5-1 in Section II Provisioning Setting Chart 5-3 in Section II BER Measurement **

Chart 4-2 in this Section Meter Reading Chart 3-2 in this Section System Configuration Setting Chart 5-1 in Section IT Date and Time Setting Chart 4-7 in this Section Provisioning Setting Chart 5-3 in Section II Relay/House Keeping Setting*

Chart 5-4 in Section II BER Measurement **

Chart 4-2 in this Section Meter Reading Chart 3-2 in this Section System Configuration Setting Chart 5-1 in Section II BER Measurement **

Chart 4-2 in this Section Meter Reading Chart 3-2 in this Section Notes: 1. * This procedure is to be performed, as required. 2. ** The BER measurement is optional, perform if necessary. 3. All setting items must be restored to original condition. 4-29 PREVENTIVE MAINTENANCE ROi-S04824 4-30 tt Chart 4-6 System Configuration Setting This chart describes the procedure for setting the system configuration after system has modified or replaced equipment. The items to be set are as follows:

* Equipment Configuration

* Main Interface

+ RF Frequency

* TX Power Control

* Frame ID Step Procedure 1 Referring to Fig. 2-2 in Chart 2-1, connect the RS-232C cable between the LCT and the MDP, 2 Open the Terminal software (e.g; HyperTerminal), 3 Enter Login name Admin and press the Enter key, 4 Enter password 12345678 and press the Enter key, Login : Admin Password : ****""**

- NEC PDH RADIO VER. X.XX.XX 0. Logout 4. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5. Inventory Data 6. Relay / House Keeping 7, Maintenance Enter Selection :

5 Setting of the system configuration should be performed according to the procedure chart 5-1 in Section IT Operation. tt tt ROIN-S04824. PREVENTIVE MAINTENANCE Chart 4-7 Date and Time Setting This chart describes the procedure for setting date and time. When the MDP is turned off for an extended period (i.e. approx. 1 week or more), the equipment time setting could have been cleared, In such case, verify and re-enter the time setting after turning on the MDP. Step Procedure 1 Press the ESC key to go back to the following menu,

~~ NEC PBH RADIO VER. X.XX.XX ---

0. Logout 4. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4. System Configuration 5. Inventory Data 6. Relay / House Keeping 7. Maintenance Enter Selection :

2 Press the 7 key for Maintenance and press the Enter key, Enter Selection : 7

-~ Maintenance ---

41. MAINT Mode (OFF) 2. Control 3. Reset CPU 4. Set Calendar 5. Password Setting 6. Program Download Enter Selection : 4 Set Calendar -

Enter Year : 2007 Enter Month :2 EnterDay :28 EnterHour : 78 Enter Min 220 EnterSec :40 Success !!

3 Press the 4 key for setting the Set Calendar and press the Enter key, 4-31 PREVENTIVE MAINTENANCE ROI-S04824 Chart 4-7 Date and Time Setting (Cont'd) Step Procedure 4 Set all items according to display of the LCT, 5 After setting the time, proceed to Chart 5-8 for the Provisioning setting. 4-32 ROI-S04824 PREVENTIVE MAINTENANCE Chart 4-8 Inventory Data Monitoring Step Procedure 1 Referring to Fig. 2-2 in Chart 2-1, connect the RS-232C cable between the LCT and the MDP, 2 Open the Terminal software (e.g. HyperTerminal), 3 Enter Login name Admin and press the Enter key, 4 Enter the specified password and press the Enter key, Login : Admin Password : ********

-- NEC PDH RADIO VER. X.XX.XX =

0, Logout 1. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5. Inventory Data 6. Relay / House Keeping 7. Maintenance Enter Selection :

5 Press the 5 key for Inventory Data and press the Enter key, Display Inventory data Module | Code No. | Date | Serial No. | HW Type. | SW Ver. TRPNo.t |G7965A {2001/01/27 | 004004 0018 TRPNo2 |G7965A | 2001/01/27 {004002 | 001S MD UNIT No.1 |G8538A [2001/02/20 |004002 | -

SWUNIT | G8540A | 2001/02/20 | 004002 | -

MD UNIT No.2 |G8538A | 2001/02/20 [004002 | -

Note: The data for No.2 CH TRP and MDP are not displayed for 1+0 system. Each item in the inventory data is explained below.

* TRP No.1: Indicates the information on the No.1 channel TRP.

* TRP No.2: Indicates the information on the No.2 channel TRP.

* MDUNIT No.1: Indicates MD UNIT mounted on the top layer of the three-layer equipment. 4-33 PREVENTIVE MAINTENANCE 4-34 34 pages ROI-S04824 Chart 4-8 Inventory Data Monitoring (Cont'd) Step Procedure

* SW UNIT : Indicates the UNIT located at the middle layer of the three-layer.

* MD UNIT No.2: Indicates the UNIT mounted on the lower layer of the three-layer equipment. Note: The end of HW Type signifies the type of TRP. S: Super High Grade (SHG) H: High Grade (HG) Press the ESC key, Press the 0 key to Logout and press the Enter key. ROI-S04824 5.1 General 5.2 Procedure CHANGING PASSWORD 5. CHANGING PASSWORD rn TS A a eS STEEN SIRES This Section provides the procedure for changing the login password to access the LCT. Note: If you enter invalid the password, login of LCT as Administrator is impossible. When you change the login password, be careful enough. Procedures for changing the password is referred to the Chart 5-1. Chart 5-1 Changing Password Step Procedure 1 Connect the RS-232C cable between the LCT and MDP, 2 Open the Terminal software (ex. HyperTerminal), 3 Enter Login name Admin and press the Enter key, Login : Admin Password : *******

~~ NEC PDH RADIO VER. X.XX.XX --

0, Logout 1. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4. System Configuration 5, Inventory Data 6. Relay / House Keeping 7. Maintenance Enter Selection :

CHANGING PASSWORD RO!I-S04824 Chart 5-1 Changing Password (Cont'd) Step 4 5 Procedure Enter the current login password and press the Enter key, Press the 7 key and press the Enter key, Enter Selection : 7

~~ Maintenance ---

1. MAINT Mode (XXX) 2. Control 3. Reset CPU 4. Set Calendar 5, Password Setting 6. Program Download Enter Selection : 5

-- Password Setting Enter CurrentPassword : **"*****

Enter NewPassword : ********

Enter NewPassword : ********

~~ Maintenance --

4. MAINT Mode (XXX) 2. Control 3. Reset CPU 4. Set Calendar 5. Password Setting 6. Program Download Enter Selection :

Oo Oo sD 10 il Press the 5 key for password setting and press the Enter key, Enter the current password and press the Enter key, Enter the new password (8 figures) and press the Enter key, To confirm the password, re-enter the new password and press the Enter key, Press the ESC key to return to previous menu, Press the 0 key to logout. 5-2 2 pages