R OI-504824-051E CONTENTS 031020 5.8 GHz 15/28/50 MB PDH DIGITAL MICROWAVE RADIO SYSTEM N Lite L (PDH SYSTEM) SECTION IV MAINTENANCE CONTENTS A SEA TITLE PAGE 1. GENERAL 4.1 2. PRECAUTIONS 2-4 Chart 2-1 Maintenance Mode Setting 2.3 3. PREVENTIVE MAINTENANCE 3-1 31 Test Sets and Accessories 3-1 32 LCT Maintenance 3.2 Chart 3-1 Maintenance Mode Setting 3.2 33 Performance 3.4 Chart-2 Performance Monitoring ssmssmsessessesseer 3-4 4. CORRECTIVE MAINTENANCE 4.4 41 Maul Location 4.
CONTENTS 1. GENERAL 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.
OI-504824 PRECAUTIONS 2. PRECAUTIONS mS Ee] The following precautions must be carefully observed during maintenance. (a) The maintenance personnel should report arrival at and departure from a station fo the relevant station. The following are dangers and warnings to the maintenance personnel. Warning: 1. The —43 V DC power is superimposed on the center conductor of the UF cable between the MDP and the TRE.
PRECAUTIONS OI-504824 Information on the maintenance and the control such 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, alarms) 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 control such as TX MUTE, CW, LB, etc.
R OI-S04824 PRECAUTIONS Chart 2-1 Maintenance Mode Setting Step Procedure 1 Connect the RS-232C cable between the LCT and the MDP, 0 (© Note: * The MD Unit No.2 is not provided Jor I+0 system. Fig. 2-2 LCT Setup 2 Open the Terminal software (e.
R OI-S04824 TEST SETS AND ACCESSORIES 3. PREVENTIVE MAINTENANCE EAST DATA 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.
TEST SETS AND ACCESSORIES OI-504824 3.2 LCT Maintenance Mode 3z Chart 3-1 Maintenance Mode Setting Step Procedure 1 Enter Login name “Admin” and the “Enter” key, Login: Admin Sp — NEC PDH RADIO VER. XXX.XX — 0, Logout 1. Alarm / Status 2. Performance Monitor 3. Provisioning Data 4. System Configuration &. Inventory Data 6. Relay / House Keeping 7.
OI-604824 TEST SETS AND ACCESSORIES Chart 3-1 Maintenance Mode Setting (Cont'd) Step Procedure & Restoring to Normal Mode Cross the “7” key and press the “Enter” key, NEC POH RADIO VERIFICATION — 0. Logout 1. Alarm / Status 2, Performance Monitor 3, Provisioning Data 4. System Configuration 5, Inventory Data. 8. Relay / House Keeping 7. Maintenance Enter Selection : 7 Maintenance — 1. MAIN Mode (ON) 2. Control 3. Reset CPU 4. Sat Calendar 5. Password Setting 8.
TEST SETS AND ACCESSORIES R OI-S04824 3.3 Performance Monitoring Chart 3-2 Performance Monitoring Step Procedure 1 Connect the RS-232C cable between the LCT and MDP (see Fig. 2-2 in Chart 2-1), 2 Open the Terminal software (c.g; Hypertension, 3 Enter Login name “User” and press the “Enter” key on the LCT, Login : User — NEC PDH RADIO VER, XXX{XX — 0. Logout 1, Alarm / Status 2. Performance Monitor 3, Provisioning Data 4, System Configuration §. inventory Data 6.
OI-804824 TEST SETS AND ACCESSORIES Chart 3-2 Performance Monitoring (Cont'd) Step Procedure 5 Press the “1” key for Display Metering /BER and press the “Enter” key. Verify the all items listed in Table 3-2. NEG POH RADIO VER XOX XK — . Logout . Alarm Status Performance Monitor . Provisioning Data , System Configuration . Inventory Data . Relay / House Keeping Enter Satisfaction : 2 Cope © — Performance Monitor — 1. Display Metering / BER 2. Display Performance Monitor 3.
TEST SETS AND ACCESSORIES OI-504824 Chart 3-2 Performance Monitoring {Cont'd) Step Procedural ‘able 3-2 Meter Reading Check lem Normal Indication Allowable Range TX POWER 10.5 GHz +21 to ~7 dBm Normal indication LEVEL ~30 dBm* 10.5 GHz —15 1084.0 dBm TRP PS MON ~43 xx “3rd-46 VDC 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, **arise with cable length between the MDP and TRP. 4.
OI-804824 4.1 Fault Location PREVENTIVE MAINTENANCE 4. CORRECTIVE MAINTENANCE EAA 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.
PREVENTIVE MAINTENANCE R OI-S04824 42 {c¢) Loop back 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 loop back. Locate the fault by using the following diagrams. « Fig, 4-1~ Loop back Diagram for Fault Isolation Shows the section from where the signal is turned back. « Chart 4-2 — Loop back BER Measurement + Fig.
R OI-S04824 PREVENTIVE MAINTENANCE TX Mute Turns off/disables the transmitter output. RX 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 Loop back Used for localizing equipment failure to MDP or TRP. The input 1.
PREVENTIVE MAINTENANCE OI-804824 2X LEVEL MON ve RX NBT LEVEL mice) Ir SEI. nUT sve, [5] ‘Table 4-1 Fault Isolation by Meter Reading Meter Reading Condition —— TX Power Rx Level | TRP PS MON 1 Oo TRP 2 O Path propagation or TRP 3 DC-DC CON module on MD UNIT oO 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.
R OI-S04824 PREVENTIVE MAINTENANCE Chart 4-1 Alarm and Status Monitoring Step Procedure 1 Connect the cable between the LCT and MDP (sce Fig. 2-2 in Chart 2-1), 2 Open the Terminal software (e.g; Hypertension, 3 Enter Login name “User” and press the “Enter” key on the LCT, Long = User — NEC POH RADIO VER, XXX.XX ~~ 0. Logout 4, Alarm / Status 2. Performance Monitor 3. Provisioning Data 4, System Configuration 5. inventory Data 8.
PREVENTIVE MAINTENANCE 48 Chart 4-4 Alarm and Status Monitoring (Cont'd) — NEC PDH RADIO VER, XXX.XX 0. Logout 1. Alarm / Status 2, Performance Monitor 3, Provisioning Data 4. System Configuration 8, Inventory Data 8. Relay / House Keeping Enter Selection: 7 we TRE TX Power Normal TX Input Normal RX Laval Normal > APC Normal | Cable Alarm J Next Data ? (YIN): ¥ oe MDP MOD Alar 3 DEM Alarm High BER Normal .
OI-804824 PREVENTIVE MAINTENANCE Chart 4-1 Alarm and Status Monitoring (Cont'd) Step Procedure Notes: 1. In the 1+1 system, status for appeared in the left side and for 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. *3 In the system, (CH-08) is indicated only. *3 Inn the system, (CHOC-08) and (CHIS-16) are indicated 6.
PREVENTIVE MAINTENANCE OI-504824 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.
R OI-S04824 PREVENTIVE MAINTENANCE Chart 4-1 Alarm and Status Monitoring (Cont'd) Step Procedure BE Interlinear: Indicates the Interlinear control status. When the “Interlinear control” for the TRP corresponded to the BB Interlinear is set to “AUTO” mode, “OPR” appears, if it is reset, “NO OPR” appears. When the TRP is not corresponded to the BB Interlinear, N/A appears. LOS: Indicates the input status of the 1.5 MB signal for Main INTER. If the input is disconnected, this alarm is issued.
PREVENTIVE MAINTENANCE R OI-S04824 Chart 4-1 Alarm and Status Monitoring (Cont'd) Step Procedure 5 Press the “0” key to logout and press the “Enter” key. TRANSMITTING END RECEIVING END MOP. we TE MOP re Fm pT MOORISH EU SPEED SPEED us ANALYZER CON CON MOD foment DEM —=1 CON CON {as} |e | i FOOLISH UB SPEED ) | SPEED ) BAS ANALYZER CON con DEM RX bf TX + Ton CORY CTR... MODEM MODEM _ CTR Fig.
R OI-S04824 PREVENTIVE MAINTENANCE Chart 4-2 Loop back BER Measurement Apparatus: PDH Analyzer Step Procedure 1 Disconnect the D-sub connectors from the CH 1-CHR JOUSTING or CH 9-CH16 IN/OUT on the MDP (see Fig. 4-2), 2 Set the PDH Analyzer as follows: + Nitrate : 1.544 Bps (ANSI T1.102) » Code format : BRAZOS or AMI « Impedance : 100 ohms, balanced 3 Set up as in Fig.
PREVENTIVE MAINTENANCE R OI-S04824 Transmitting En POH ANALYZER Receiving End PDH 7 ANALYZER cpl 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.
OI-504824 PREVENTIVE MAINTENANCE Chart 4-3 Loop back Control Setting “This chart contains: A. Preparation: Steps 1108 B. IF Loop back Control: Steps Main Signal Loop back (Near End) Control: Steps Main Signal Loop back (Far End) Control: Steps 2310 30° Note: * Applies to 8/16 x 1.5 MB system. Step Procedure Notes: 1. Service will be interrupted during Loop back condition. 2, Following Loop back operation is not performed simultaneously. » IF Loop back + Near End Loop back + Far End Loop hack 3.
PREVENTIVE MAINTENANCE OI-504824 4-14 Chart 4-3 Loop back Control Setting (Cont'd) Step Procedure 4 Enter specified password and press the “Enter” key, 5 Press the “7” key for Maintenance and press the “Enter” key, Enter Selection: 7 ~~ Maintenance 1. MAIN Mode (OFF) 2. Control 3. Reset CPU 4, Set Calendar 5. Password Setting 8. Program Download Enter Selection : 1 ~~ MAIN Mode — 1.0n 2, Of Enter Selection: 1 ~ Maintenance 1. MAIN Mode (ON) 2. Control 3. Reset CPU 4. Set Calendar 5. Password Setting 8.
OI-504824 PREVENTIVE MAINTENANCE Chart 4-3 Loop back Control Setting (Cont'd) Step Procedure 9 Press the “7* key for IF loop back and press the “Enter” key, Enter Selection : 2 ~— Control Frequency £ 2. ATP Marital Control i 4. TX Mute Loop back | 8. Main Signal Loop back (Near End) i 9. Main Signal Loop back (Far End) 11. Antenna Alignment Mode 16. LAN Device Reset Enter Selection Loop back ~~ 1.0n 2, Off Enter Selection: 7 This will affect the radio fink connection.
PREVENTIVE MAINTENANCE OI-804824 Chart 4-3 Loop back Control Setting (Cont'd) Step Procedure C. Main Signal LOOP BACK (NEAR END) CONTROL Note: Used for localization of equipment failure in the MUX or Radio equipment. The input 1.544 Bps signal from MUX is looped back immediately, and then output with 1.544 Bps signal (see Fig. 4-1). 15 Press the “8” key for Main Signal Loop back (Near End) and press the “Enter” key, Enter Selection: 2 ~ Contort — 1. RF Frequency 2.
OI-804824 PREVENTIVE MAINTENANCE Chart 4-3 Loop back Central! Setting (Cont'd) Step Procedure Press the “1” key for selected CH Loop back and press the “Enter” key, Press the desired channel number key and press the “Enter” key, Press the “1” key for ON and press the “Enter” key, Press the “'Y” key and press the “Enter” key, then “Success It” is displayed, Note: In the loop back condition, * mark is indicated.
PREVENTIVE MAINTENANCE OI-504824 Chart 4.3 Loop back Contort Setting (Cont'd) Step Procedure 23 Press the “9” key for Main Signal Loop back (Far End) and press the “Enter” key, 8. CW CH Elect .0n 2.0% Success !f Notes: 25 4-18 wn SOLON 1. RF Frequency 2. ARC Manual Control 4. TX Mute 5. RX Manual Control 7. IF Loop back 8. Main Signal Loop back (Near End) 9. Main Signal Loop back (Far End) 11. Antenna Alignment Mode 16. LAN Device Reset Enter Selection : & wen Milan Signal Loop back (Far End) —1.
R OI-S04824 PREVENTIVE MAINTENANCE Chart 4-3 Loop back Contort Setting (Cont'd) Step Procedure 26 Press the #1” key for ON and press the “Enter” key, 27 Press the “Y” key and press the “Enter” Key, then “Success 1” is displayed, 28 After the loop back test for BER, press the “ESC” key to rectum to previous menu, Main Signal Loop back (Far End) — 1. Selected CH Loop back 2. Alt CH Loop back OF Enter Selection: 2 This wilt affect the radio link connection.
PREVENTIVE MAINTENANCE OR-504824 4.2 Replacement The replacement procedures of the MDP and TRF is described below, 4.21 MDP Replacement The procedures for replacing MDP with spare are given in the Chart 4.4, Chart 4-4 MDP Unit Replacement Warning: Persons performing servicing must take necessary steps (0 avoid electrostatic 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.
ROLE-804824 PREVENTIVE MAINTENANCE Chart 4-4 MDP Unit Replacement (Cont'd) Step Procedure 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 T+1 system, Turn off the power switch on the UNIT (ses Fig. 4-3), Disconnect the power cable from the SEL V connector on the No.
PREVENTIVE MAINTENANCE R OI-S04824 Chart 4-4 MDP Unit Replacement (Cont'd) Step Procedure UNIT REPLACEMENT REMOVING 18 Repeat steps 1 to 7 for No.2 CH MD UNIT, 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 fo 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.
RONSTADT PREVENTIVE MAINTENANCE No. 1 PWR No.1 GH SEL V SCREW i ju PNT 1Ct Eom Ee. EL NOE IRR FA. Tran sno || o Bef He mm Swe secs] © toots) Co, ES UT wool i le slp ICICLE UNIT No. 2ZPWR “yo 2 cH SLY ore ve No.2 CH MD UNIT 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.
PREVENTIVE MAINTENANCE R OI-S04824 Chart 4-5 TRP Replacement Step Procedure 10.5 GHz BAND TRP REMOVING 1 Turn off the power switch on the associated MDP, Caution: Do not remove the IF line cable before turn OFF the power switch on the MDP.
OI-504824 PREVENTIVE MAINTENANCE Chart 4-5 TRP Replacement (Cont'd) 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 wave guide 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.
PREVENTIVE MAINTENANCE R OI-S04824 Chart 4-5 TRP Replacement (Cont'd) Step Procedure GUIDE PIN \ — PLATE MARKED H PLATE MARKED V PLATE MARKED H V POLARIZATION + POLARIZATION V/H Polarization Conversion 11 Put the spare TRP onto the bracket, Note: Be careful not to damage the flange.
OI-504824 PREVENTIVE MAINTENANCE Chart 4-5 TRP Replacement (Cont'd) Step Procedure 12 TRP 13 Mount the spare TRP onto the bracket, and tighten the four screws on the TRP, SCREWS SCREWS Reconnect the IF cable to the IF IN/OUT connector on the TRE, 4-27
PREVENTIVE MAINTENANCE R OI-S04824 Chart 4-5 TRP Replacement (Cont'd) Step Procedure 14 Wrap the IF IN/OUT connector with self-bonding tape for ‘waterproofing. This part should be wrapped by self-bonding taps for waterproofing. | TRE {FL CONNECTOR IF CABLE . Som TRP SELF-BONDING TAPE IF CABLE 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.
OI-804824 PREVENTIVE MAINTENANCE 4.3 Alignment 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. Table 4-2 Equipment Alignment Equipment ela eo Alignment item Reference Procedure MDP MD UNIT 1. System Configuration Setting | Chart 5-1 in Section If 2. Provisioning Setting Chart 5-3 in Section TE 3. BER Measurement ** Chart 4-2 in this Section 4.
PREVENTIVE MAINTENANCE OI-504824 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 R8-232C cable between the LCT and the MDP, 2 Open the Terminal software (e.
OI-504824 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 settling could have been cleared. In such case, verify and re-enter the time setting after tuning on the MDP. Step Procedure 1 Press the “ESC” key to go back to the following menu, “NET PDH RADIAN VER. XXX XX == 0. Logout 1. Alarm / Status 2. Performance Monitor 3.
PREVENTIVE MAINTENANCE OI-504824 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.
OI-504824 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, Hypertension, 3 Enter Login name “Admin” and press the “Enter” key, 4 Enter the specified password and press the “Enter” key, Login: Admin Password 1 #»t we NEC PDH RADIO VER. XXX.XX 0. Logout 1. Alarm / Status 2, Performance Monitor 3. Provisioning Data 4, System Configuration 5. Inventory Data 6.
PREVENTIVE MAINTENANCE R OI-S04824 Chart 4-8 Inventory Data Monitoring {Cont'd} Step Procedure + UNITIES : Indicates the UNIT located at the diddle 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 TRF. S: Super High Grade (SHG) H: High Grade (HG) 6 Press the “ESC” key, 7 Press the “0” key to Logout and press the “Enter” key.
R OI-S04824 5.1 General 5.2 Procedure CHANGING PASSWORD 5. CHANGING PASSWORD ET This Section provides the procedure for changing the login password to access the LCT. Note: If you enter invalid the password, login of LCT ag 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 R8-232C cable between the LCT and MDP, 2 Open the Terminal software (ex.
CHANGING PASSWORD OI-804824 Chart 5-1 Changing Password (Cont'd) Step Procedure 4 Enter the current login password and press the “Enter” key, 5 Press the “7” key and press the “Enter” key, Enter Selection: 7 1 ~~ Maintenance 1. MAIN Soda (XXX) 2. Control 3. Reset CPU 4. Set Calendar 5, Password Setting 8, Program Download Enter Selection : 5 — Password Setting -Enter Current Password 1 = Enter New Password : | Enter Password : ~~ Maintenance ~1. MAIN Mode (XXX) 2. Control | 3. Reset CPU | 4, Set Calendar 8.