NEC Pasolink Maintenance Manual

ROI-S06375-054E CONTENTSMarch, 2008

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PASOLINK NEO/c7-38 GHz PDH DIGITAL RADIO SYSTEM

Section IV MAINTENANCE

CONTENTS

TITLE PAGE

1 GENERAL ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1-12 PRECAUTIONS •••••••••••••••••••••••••••••••••••••••••••••••••••••• 2-13 TEST SETS AND ACCESSORIES••••••••••••••••••••••••••••••• 3-14 ROUTINE MAINTENANCE •••••••••••••••••••••••••••••••••••••••• 4-14.1 Meter Reading ••••••••••••••••••••••••••••••••••••••••••••••••••• 4-14.2 Performance Monitoring•••••••••••••••••••••••••••••••••••••• 4-25 CORRECTIVE MAINTENANCE •••••••••••••••••••••••••••••••••• 5-15.1 Alarm/Status ••••••••••••••••••••••••••••••••••••••••••••••••••••• 5-15.1.1 Alarm and Status ••••••••••••••••••••••••••••••••••••••••••••••• 5-2

5.1.2 Maintenance 1 Item •••••••••••••••••••••••••••••••••••••••••••• 5-7

5.1.3 Loopback ••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5-9

5.1.4 BER Measurement •••••••••••••••••••••••••••••••••••••••••••• 5-14

5.1.5 Trouble Shooting Flow••••••••••••••••••••••••••••••••••••••• 5-17

5.2 Replacement •••••••••••••••••••••••••••••••••••••••••••••••••••• 5-205.2.1 ODU Replacement••••••••••••••••••••••••••••••••••••••••••••• 5-20

5.2.2 IDU and Module Replacement•••••••••••••••••••••••••••••• 5-26

5.2.3 Fuse Replacement •••••••••••••••••••••••••••••••••••••••••••• 5-35

CONTENTS ROI-S06375

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ROI-S06375 CONTENTS

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ROI-S06375 GENERAL

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1. GENERAL

This section provides instructions for maintenance of the PASOLINK NEO/c used for 7-38 GHz PDH microwave radio system.

This section provides instructions on the precautions, test setup andaccessories, routine maintenance, corrective maintenance and mounting ofoptional modules.

GENERAL ROI-S06375

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ROI-S06375 PRECAUTIONS

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2. PRECAUTIONS

The following precautions must be carefully observed duringmaintenance.

(a) The maintenance personnel should report arrival and departurefrom a station to the relevant station. The following are dangersand warnings to the maintenance personnel.

Warning: 1. The –48 V DC power is superimposed on the centreconductor of the coaxial cable between the IDU and theODU. Connecting test equipment directly to this terminalmay damage it and touching the coaxial cable core maycause electrical shock.

2. Persons performing maintenance must take necessarysteps to avoid Electro-static Discharge (ESD) which maydamage the modules on the IDU or cause error. Wear aconductive wrist strap connected to the grounded (G) jackon the front of the equipment shelf. This will minimizestatic build-up during maintenance. (see Fig. 2-1).

3. Do not remove/connect the IF cable with the IDU powerON. Turn the IDU power OFF before connecting/disconnecting the IF cable, or equipment may bedamaged.

4. After turning ON the equipment, wait at least 1 minutebefore turning it OFF again. Repeatedly turning thepower ON and OFF within a short interval may cause theIDU to fail.

5. Do not allow open or short circuit of ODU TX outputwith the TX power on conditions. Perform the TX Mutecontrol in the Maintenance mode or turn the PWR switchoff at the IDU before disconnecting cable or feeder fromthe ODU TX output.

6. Contact NEC before program download on the LCT isperformed. Equipment may not function correctly withimproper operation.

Caution: 1. The top surface of the IDU above MODEM is hot inoperation.

2. When replacing the MODEM, 16E1 INTFC or DC-DC CONV (optional) turn off the PWR switch and disconnect all cables connected to the module which is to be replaced.

(b) During maintenance, the IDU should be set to Maintenance “On”condition by the local craft terminal (LCT).

PRECAUTIONS ROI-S06375

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(c) To avoid traffic interruption, under the maintenance, perform TX/RX SW manual switching in 1+1 system,.

Note: When TX/RX SW has been automatically switched during afault, keep this condition by manual switching operation.

(d) While the CPU is initialized by the CPU RESET switch, alarm(s)status is reset to normal. After initialization, the alarm informationis properly provided through relay contacts.

(e) Information on the maintenance and the control such as Mute, CW,LB, etc. is released if the power is turned off.

(f) If each setup item of “Equipment Setup” or “Provisioning” ischanged during in operation, traffic will be momentarilyinterrupted.

(g) When the TX SW is activated, momentary traffic interruption mayoccurs.

(h) Before removing or installing the IDU/ODU, turn off the powerswitch on the MODEM (* 1+1) or IDU (* 1+0).

(i) After completing maintenance, restore all connections, manualcontrol settings to normal and confirm that all alarm LEDs areunlit.

(j) When replacing the MODEM, 16E1 INTFC with spare, disconnectevery cables connected to the module which is to be replaced, thenturn off the power switch on the MODEM (* 1+1) or IDU (* 1+0)surely.

(k) After equipment start-up, allow the equipment to warm up at least30 minutes.


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Caution

Tighten the TNC-male connector ofIF cable to the IDU with engageconnector nut only using fingers andholding the cable with another hand.

Tighten the engage connector nutonly for the L-angle connector also.

(Tightening Torque: 0.3 to 0.5 N•m(3 to 5kg•cm))

IDU

IDU

IF CABLE

IF CABLE

IDU

IF CABLE

Straight Type

L-Angle Type

L Angle Type

If rotate other parts of the L-angleconnector as illustrated left, it cancause connector damage.


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Chart 2-1 Wrist Strap Connection

Step Procedure

1 Connect the wrist strap to the ESD ground terminal (G),

Fig. 2-1 ESD Ground Terminal Location

1+0 SYSTEM

1+1 SYSTEM IDU

G

G G

PASOLINK NEOIF IN/OUTG

2M IN/OUT-A OW/SC/ALM LCT NMS NE1 NE2 V.11

AUX/ALM

EOWCALL

MAINTODUIDUPWR

PWR

PULLFUSE -48V

SELV

125VDC/T7.5A


2M IN/OUT-A 2M IN/OUT-B OW/SC/ALM LCT NMS NE1 NE2 V.11

AUX/ALM

EOWCALL

MAINTODUIDUPWR

PWR

PULLFUSE -48V

SELV

125VDC/T7.5A

SELV

AUX/ALM SC IN/OUT EOW

PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR

PASOLINK NEO2M IN/OUT-A 2M IN/OUT-B

PULLG

IF IN/OUT

SELV

TXRX

PWRODUMD/CBL PWR

PULLG

LCT NMS NE

100M PORT1 PORT2 100M

ALM

GG

CPV16

CPV16

G

1+0 SYSTEM

IDU

IDU


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Chart 2-2 Maintenance Mode Setting

Step Procedure

For the LCT operation, refer to Chapter 6 of LCT Operation inAppendix of this Section IV.

Maintenance Mode Setting

1 Connect the USB port and the LCT port of the PC and the LCTusing a USB cable, (see Fig. 2-2)

Fig. 2-2 LCT Setup

SELV


PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR


PULLG

IF IN/OUT

SELV

TXRX

PWRODUMD/CBL PWR

PULLG

LCT NMS NE


ALM

GG

PC

USB Cable

1+0Ex SYSTEM

LCT Port

USB Port

1+1 SYSTEM

1+0 SYSTEM



AUX/ALM

EOWCALL

MAINTODUIDUPWR

PWR

PULLFUSE -48V

SELV

125VDC/T7.5A

CPV16

LCT Port

LCT Port

(Blank)

SELV


PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR


PULLG

LCT NMS NE


ALM

G

G


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Chart 2-2 Maintenance Mode Setting (Cont’d)

Step Procedure

2 Enter User name “Admin” and enter the valid Password,

3 Click on “Login” button,

4 Click on “Maintenance” button in “LCT MENU”,

5 Click on “Maintenance1” button in “Maintenance” backgroundmenu,

LCT MENU

Alarm/StatusEquipment SetupInventoryAUX I/OMaintenance Maintenance1 Maintenance2ProvisioningMeteringPMON(History)

---Maintenance1---Item Value SettingMaintenance Off Off On Set


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Chart 2-2 Maintenance Mode Setting (Cont’d)

Step Procedure

6 Click on “On” Setting button of the Maintenance, click on “Set”button, then Maintenance Value turns to “On” and Maintenancestatus in “Summary Status area turns to “On”.

Notes: 1. To perform setup and control the equipment, it must beset to Maintenance “On” mode using LCT.

2. In Maintenance “On” mode, external alarm outputs aremasked and automatic control is inhibited.*

*: 1+1/1+0 with option: RL3 to RL6 can be masked inauto mode. RL1 and RL2cannot be masked.

1+0 without option: RL1 and RL2 can be masked.(RL3 to RL6 can be maskedoptionally.)

Restoring to Normal Mode

7 Click on “Maintenance1” button,

8 Click on “Off” or “Auto” control button and click “Set” buttonfor each control item which has been manually controlled,

9 Click on “Off” setting button of Maintenance,

10 Check that there is not coloured yellow items and Maintenance“Off”, is displayed in Progress Status.

Note: To restore the Maintenance mode to normal mode, first resetthe control from control “On” to control “Off” (or Auto),then set the mode to Maintenance “Off”.

---Maintenance1---Item Value SettingMaintenance On Off On Set

Maintenance On

Summary Status


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Chart 2-3 Manual Switchover Operation (only 1+1 Configuration)

Step Procedure


1 Connect the USB port and the LCT port of the PC and the LCTusing a USB cable, (see Fig. 2-2)

2 Login to the LCT with User name “Admin” and Admin“Password”,

3 Click on “Maintenance” button in “LCT MENU” and click on“Maintenance1” button in Maintenance background menu,

Note: Control items can be performed only when the MAINTmode is “On”.

Note: Control items displayed on the LCT vary depending onsystem configuration.

4 Click on TX SW and/or RX SW to desired “No.1”, “No.2” or“Auto” button,

5 Click on “Set” button,

6 After test has been completed, set the TX SW and RX SW to“Auto” position,

7 Set maintenance mode to “Off” according to Chart 2-2.

---Maintenance1---Item Value SettingMaintenance On Off On SetTX SW Manual Control No.1 Auto No.1 No.2 SetRX SW Manual Control Auto Auto No.1 No.2 SetRX SW Maintenance Mode Manual

ROI-S06375 TEST SETS AND ACCESSORIES

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3. TEST SETS AND ACCESSORIES

The test sets and special accessories listed in Table 3-1 are required formaintenance. If recommended test sets and accessories are not available,equivalents may be used.

Notes:1. * The PASOLINK Monitor operates on a dry battery (6F22/9V). When the PASOLINK Monitor will not be used for along period, remove the battery to avoid damage frombattery leakage and corrosion.

2. ** Refer LCT Operation in Appendix in this Section IV.

Table 3-1 Test Sets and Accessories

No. Model Type Model Number Manufacture

1 SONET/SDH/PDH Analyzer MP1570A ANRITSU

2 Optical Variable Attenuator MN95D ANRITSU

3 Digital Multimeter 34401A Agilent

4 PASOLINK Monitor* X0818 NEC

5 Screwdriver — —

6 T Type Hexagonal Driver — —

7 Torque Wrench — —

8 PC for Local Craft Terminal (LCT)** — —

TEST SETS AND ACCESSORIES ROI-S06375

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ROI-S06375 PREVENTIVE MAINTENANCE

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4. ROUTINE MAINTENANCE

This chapter provides the routine (annually) maintenance procedures toensure the satisfactory operation of the equipment. During routinemaintenance, carefully observe the precautions given in Chapter 2.

4.1 Meter Reading

Chart 4-1 Meter Reading

Step Procedure

Notes:1. If an abnormal indication appears, check Alarm/Status, performance monitor and perform loopbacktest to distinguish sections of normal and alarmed.

2. RX LEV varies depending on received RF signal level.3. Power Supply voltage at ODU varies depending on IF

cable length between the IDU and ODU.4. During total number of erroneous bits and total

number of correctly received bits are calculating,“Calculating” is displayed.

5. 1.0E-10 is indicted equal to 1 x 10-10.

----Metering---No.1 No.2

TX Power[dBm] +0.7 *RX Level[dBm] -65.2 -70.0ODU Power Supply[V] -45 -45BER 1.0E-10 Calculating

LCT MENU

Alarm/StatusEquipment SetupInventoryAUX I/OMaintenanceProvisioningMeteringPMON(History)


1 Connect the PC to the IDU using USB cable, (Refer to Fig. 2-2in Chart 2-2)

2 Login to the LCT with User name “User”,

3 Click on “Metering” button in “LCT MENU”,

PREVENTIVE MAINTENANCE ROI-S06375

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4.2 Performance Monitoring

Chart 4-2 Performance Monitoring

Step Procedure

Detailed 24 hours 15min RX Level performance monitor dataare displayed,

---RX Level (15min)--- Maintenance Mode: on : Current Time

Date Time Status MIN(No.1) MAX(No.1) MIN(No.2) MAX(No.2)2006/01/05 15:30-15:45 -59.7 -58.6 -59.3 -58.12006/01/05 15:45-16:00 -59.8 -58.7 -58.7 -58.22006/01/05 16:00-16:15 -59.5 -59.0 -58.7 -58.22006/01/05 16:15-16:30 -59.5 -59.0 -58.7 -58.22006/01/05 16:30-16:45 -59.5 -59.0 -71.2 -58.22006/01/05 16:45-17:00 -74.2 -55.8 -58.8 -54.12006/01/05 17:00-17:15 -59.5 -57.9 -58.8 -58.1

LCT MENU



1 Connect the PC to the IDU using USB cable, (Refer to Fig. 2-2in Chart 2-2)

2 Login to the LCT with User name “User”,

3 Click on “PMON (History)” in “LCT MENU”,

PMON(History)RX Level(24H/15min)RX Level(7days/day)Total(24H/15min)Total(7days/day)RMON(Line)(24H/15min)RMON(Line)(7days/day)RMON(DMR)(24H/15min)RMON(DMR)(7days/day)

4 Click on “RX level (24H/15min)” sub-menu button in “PMON(History)”,


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Chart 4-2 (Cont’d)

Step Procedure

5 Click on “RX level (7days/day)” sub-menu button in “PMON(History)”,

Detailed 7days daily RX Level performance monitor data aredisplayed,

6 Click on “Total(24H/15min)” sub-menu button (for PDH) in“PMON (History)”,

Detailed 24 hours 15min Total performance data are displayed.

7 Click on “Total(7days/day)” sub-menu button (for PDH) in“PMON (History)”,

---RX Level (day)--- Maintenance Mode: on

Date Status MIN(No.1) MAX(No.1) MIN(No.2) MAX(No.2)2006/01/01 -59.7 -58.6 -59.3 -58.12006/01/02 -59.8 -58.7 -58.7 -58.22006/01/03 -59.5 -59.0 -58.7 -58.22006/01/04 -59.5 -59.0 -58.7 -58.22006/01/05 -59.5 -59.0 -71.2 -58.22006/01/06 -74.2 -55.8 -58.8 -54.12006/01/07 -59.5 -57.9 -58.8 -58.1

---Total(15min)---- Maintenance Mode: on : Current Time

Date Time Status OFS SEP BBE ES SES UAS2006/01/05 15:30-15:45 0 0 0 0 0 02006/01/05 15:45-16:00 0 0 0 0 0 02006/01/05 16:00-16:15 0 0 0 0 0 02006/01/05 16:15-16:30 0 0 0 0 0 02006/01/05 16:30-16:45 0 0 0 0 0 02006/01/05 16:45-17:00 0 0 0 0 0 02006/01/05 17:00-17:15 0 0 0 0 0 0


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Step Procedure

Detailed 7days daily total performance monitor data aredisplayed,

8 Click on “RMON(Line)(24H/15min)” sub-menu button in“PMON (History)”,

Detailed 24 hours 15min Line (LAN) RMON (Remote NetworkMonitoring) data are displayed.

---Total(1day)--- Maintenance Mode: on

Date Status OFS SEP BBE ES SES UAS2006/01/01 0 0 0 0 0 02006/01/02 0 0 0 0 0 02006/01/03 0 0 0 0 0 02006/01/04 0 0 0 0 0 02006/01/05 0 0 0 0 0 02006/01/06 0 0 0 0 0 02006/01/07 0 0 0 0 0 0

---RMON(Line)(15min)--- Maintenance Mode: on : Current Time

Port1

Date Time Status 1 2 3 4 52006/01/05 00:00-00:15 1:

2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:19:20:21:22:

RX UNICASTRX BROADCASTRX MULTICASTRX PAUSERX CRC ERRRX ALIGNMENT ERRRX SYMBOL ERRRX UNDERSIZERX FRAGMENTSRX 64RX 65-127RX 128-255RX 256-511RX 512-1023RX 1024-1536RX 1537-MAXRX JABBERSTX UNICASTTX BROADCASTTX MULTICASTTX PAUSETX COLLISION

2006/01/05 00:15-00:302006/01/05 00:30-00:452006/01/05 00:45-01:002006/01/05 01:00-01:152006/01/05 01:15-01:302006/01/05 01:30-01:452006/01/05 01:45-02:002006/01/05 02:00-02:152006/01/05 02:15-02:302006/01/05 02:30-02:452006/01/05 02:45-03:002006/01/05 03:00-03:152006/01/05 03:15-03:302006/01/05 03:30-03:452006/01/05 03:45-04:002006/01/05 04:00-04:152006/01/05 04:15-04:302006/01/05 04:30-04:452006/01/05 04:45-05:002006/01/05 05:00-05:15


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Step Procedure

9 Click on “RMON(Line)(7days/day)” sub-menu button in“PMON (History)”,

Detailed daily Line (LAN) RMON (Remote Network Monitoring) data aredisplayed.

---RMON(Line)(1day)--- Maintenance Mode: on

Port1

Date Status 1 2 3 4 5 61:2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:19:20:21:22:

RX UNICASTRX BROADCASTRX MULTICASTRX PAUSERX CRC ERRRX ALIGNMENT ERRRX SYMBOL ERRRX UNDERSIZERX FRAGMENTSRX 64RX 65-127RX 128-255RX 256-511RX 512-1023RX 1024-1536RX 1537-MAXRX JABBERSTX UNICASTTX BROADCASTTX MULTICASTTX PAUSETX COLLISION


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Step Procedure

10 Click on “RMON(DMR)(24H/15min)” sub-menu button in“PMON (History)”,

Detailed 15 minutes DMR (LAN) RMON (Remote Network Monitoring)data are displayed.

---RMON(DMR)(15min)--- Maintenance Mode: on : Current Time

Port1

Date Time Status 1 2 3 4 52006/01/05 00:00-00:15 1:

2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:

RX UNICASTRX BROADCASTRX MULTICASTRX PAUSERX CRC ERRRX FRAGMENTSRX 64RX 65-127RX 128-255RX 256-511RX 512-1023RX 1024-1536RX 1537-MAXRX JABBERSTX UNICASTTX BROADCASTTX MULTICASTTX PAUSE

2006/01/05 00:15-00:302006/01/05 00:30-00:452006/01/05 00:45-01:002006/01/05 01:00-01:152006/01/05 01:15-01:302006/01/05 01:30-01:452006/01/05 01:45-02:002006/01/05 02:00-02:152006/01/05 02:15-02:302006/01/05 02:30-02:452006/01/05 02:45-03:002006/01/05 03:00-03:152006/01/05 03:15-03:302006/01/05 03:30-03:452006/01/05 03:45-04:00


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Step Procedure

11 Click on “RMON(DMR)(7days/day)” sub-menu button in“PMON (History)”,

Detailed daily DMR (LAN) RMON (Remote Network Monitoring) dataare displayed.

---RMON(DMR)(1day)--- Maintenance Mode: on

Port1

Date Status 1 2 3 4 5 61:2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:

RX UNICASTRX BROADCASTRX MULTICASTRX PAUSERX CRC ERRRX FRAGMENTSRX 64RX 65-127RX 128-255RX 256-511RX 512-1023RX 1024-1536RX 1537-MAXRX JABBERSTX UNICASTTX BROADCASTTX MULTICASTTX PAUSE


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ROI-S06375 CORRECTIVE MAINTENANCE

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5. CORRECTIVE MAINTENANCE

Corrective maintenance done in the field is described in this chapter.Corrective maintenance in the field covers fault isolation, module/unitreplacement and alignment. The fault location procedures describes howto isolate module-level/unit-level faults.

Faults can be classified into those that cause deterioration of thetransmission quality and those that interrupt the traffic due to amalfunction of the equipment. This chapter explains the troubleshootingprocedures for equipment faults and the corresponding remedial methods.The purpose of troubleshooting malfunctioning equipment is to restart theservice by locating the faulty part and replacing it with a spare.

The faults that cause deterioration in the transmission quality are primarilyoriginated by changes occurred in the state of propagation. Therefore, if adecline 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 precautionsgiven in Chapter 2, until the alignment is completed.

5.1 Alarm/Status

When an alarm event has occurred, At first, check alarm indication on thefront of the IDU. Continuously, connect the PC to the LCT jack on theIDU and check alarm/status indication, Meter Reading on the LCT.

(a) Check of the ALM LED Indications and LCT IndicationA faulty part can be located by checking the ALM LED indicatorsand LCT Alarm indications. For the explanation of the ALM LEDindication, refer to Chapter 2 OPERATING EQUIPMENT inSection II. Also refer to Chapter 2 Alarm/Status in this Section IVAPPENDIX LCT OPERATION.

(b) Meter ReadingsBased on the meter readings during periodical inspection withLCT described in Chapter 4, a faulty part can be located bychecking if the reading values exceed the permissible ranges.

(c) LoopbackIn the case of an abnormal BER measurement result among themeter reading items, try to distinguish the faulty part by Chart5.1.1 Loopback.

CORRECTIVE MAINTENANCE ROI-S06375

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5.1.1 Alarm and Status

The alarm and status of each module and ODU are displayed.Each items is explained below.

ODU

Type Mismatch:Indicates the connected status of the ODU. Whenthe ODU type is not coincided with the inventorylist, “Alarm” is issued.

TX Power: Indicates the status of the transmitter in the ODU.When the transmission level is decreased 3 dB ormore from preset ATPC minimum level, “Alarm”is issued.

TX Input: Indicates the status of the ODU input signal fromIDU. When the input signal from the IDU is lost,“Alarm” is issued.

RX Level: Indicates the status of the received RF signal levelof the ODU. When the level decreased below theRX threshold level, “Alarm” is issued.

APC: Indicates the status of the synthesizer in the ODU.When any abnormality occurs in the synthesizer,“Alarm” is issued.

ODU CPU/Cable Open:Indicates the status of the CPU in the ODU or IFcable. When any abnormality occurs the CPUoperation or IF cable is open, “Alarm” issued.

Mute Status: Indicates the control status of the ODU TX poweroutput. When the TX power is set to Mute, “On” isissued.

TX SW Status (for 1+1 configuration):Indicates the TX SW status for the No. 1 or No. 2CH selection.

RX SW Status (for 1+1 configuration):Indicates the RX SW status for the No. 1 or No. 2CH selection.


5-3

MODEM

Unequipped*:Indicates the status of the MODEM existence.When the MODEM is loose contact or it is notmounted according to the “Equipment Setup”,“Alarm” is issued.

Type Mismatch*:Indicates the mounted status of the MODEM.When the MODEM type is not coincided with theinventory list, “Alarm” is issued.

Module (1+1)*/MODEM (1+0):Indicates the status of the modulator-demodulator.When a failure occurred in the modulator-demodulator and as a result of a LSI failure,“Alarm” is issued.

LOF: Indicates the frame synchronization status.When the synchronization from DMR is lost,“Alarm” is issued,

Frame ID: Indicates the status of ID number againstMODEM of opposite station or the other channelin Twinpath configuration. When ID numberassignment is improper, “Alarm” is issued.

High BER: Indicates the quality severe deterioration statusbetween radio sections. When the signaldeteriorates below the threshold preset value,“Alarm” is issued. The setable threshold valuesare: 1E-3, 1E-4 and 1E-5.

Low BER: Indicates the quality unsevere deterioration statusbetween radio sections. When the signaldeteriorates below the preset threshold value,“Alarm” is issued. The setable threshold valuesare: 1E-6, 1E-7, 1E-8 and 1E-9.

Early Warning:Indicates quality deterioration status. When thesignal deteriorates below the preset thresholdlevel, “Alarm” is issued. (When the Early Warningis used for protection switchover in 1+1configuration, RX Hitless Switch is operated.) Thepreset threshold level is less than 1E-9.

MOD: Indicates the operating status of the MOD. Whenany failure occurs in the modulator section,“Alarm” is issued.

* 1+1 (1+0Ex)


5-4

DEM: Indicates the operating status of the DEM. Whenany failure occurs in the demodulator section,“Alarm” is issued.

Input Voltage:Indicates the power supply input voltage status.When power supply is exceeding the limited,“Alarm” is issued.

Power Supply:Indicates the operating status of the power supply.When power supply is abnormal, “Alarm” isissued.

IF Cable Short:Indicates the status of IF cable between IDU andODU. When a short circuit is caused betweenODU and the IDU, “Alarm” is issued.

Cable EQL: Indicates the status of IF cable equalizer. Whenequalizer characteristics control is lost, “Alarm” isissued.

**Linearizer Function:Indicates the status of linearizer function.

OPR: When the linearizer function is used.

NO OPR:When the linearizer function is not used.In this case, TX output power decreasesapprox. 4 dBm from a standard value.

N/A: When the ODU is used withoutlinearizer function.

**Linearize: Indicates the linearizer operating status. Whenlinlearizer operation is improper in OPR condition,“Alarm” is issued.

ATPC Power Mode:Indicates the status of ATPC operation mode.When the ATPC function is improper, stop thecontrol and maintain the TX output level atHOLD/MAX/MIN selectable.

** “NEO STD ODU (NHG) plus Compact IDU” only; "NEO Compact ODU (CPV) plus Compact IDU” notsupported.


5-5

INTFC

*Unequipped:Indicates the existence status of the ( ) INTFC.When the ( ) INTFC is not equipped, “Alarm” isissued.

*Type Mismatch:Indicates the mounted status of the ( ) INTFC.When the INTFC type is not coincided with theinventory list, “Alarm” is issued.

Module (1+1)*/INTFC (1+0):Indicates the operating status of the ( ) INTFC.When any failure occurs in the INTFC(1/2)Module, “Alarm” is issued.

Input LOS (1-16) (for PDH):Indicates the input status of the input E1 signalfrom MUX. When the input is disconnected,“Alarm” is issued.

AIS Generated (for PDH):Indicates the E1 signal receiving status. When AISis generated in the ( )E1 INTFC, the status isissued.

AIS Received (for PDH):Indicates the E1 signal transmitting status. WhenAIS is received from MUX, “Alarm” is issued.

In-Phase: Indicates the received signal DADE statusbetween No. 1 and No. 2 at ( )E1 INTFC. Whenthe received signal delay time is out of permissiblerange, Outphase alarm is issued.

*LAN Link (Port ( )): Indicates the status of Link between relatedequipment and Port ( ). Indicates “Link” when thePort is linked with related equipment and indicates“Alarm” in other case.

*LAN Collision (Port ( )):Indicates the status of Collision in Half Duplexmode. In Full Duplex mode, “Normal” is alwaysdisplayed. Indicates status when Port ( ) is incollision condition.

* 1+1 (1+0Ex) only


5-6

*Link Loss Forwarding (LLF) (Port ( )):Indicates the operating status during the fault inopposite station or when the link of local Port ( )LAN is disconnected by the fault of radio section.When any failure occurs in the ( ) INTFC,“Alarm” is also issued.

*Speed & Duplex: (Port ( )): Indicates the operating mode of Port ( ).

CTRL

CTRL Module *(1+1)/CTRL (1+0):Indicates the operating status of the CTRL. Whenany failure occurs in the CTRL Module, “Alarm”is issued.

MMC*:Indicates the MMC status. When the mountedMMC is detected, “Mounted” is displayed.

* 1+1 (1+0Ex) only


5-7

5.1.2 Maintenance 1 ItemMaintenance 1 items can be selected only under maintenance mode.As this “Maintenance 1” is likely to cause disconnection of signal,take care during operation.

Details of “Maintenance 1” item is described as follows:

TXSW manual control:Controls manual switchover of the TX SW at thetransmitting side in the Hot standby (HS)configuration.

RXSW manual control:Controls manual switchover of the RX SW in the1+1 configuration. The switchover is carried outwithout traffic interruption when the DADE is In-phase. Adjustment of the delay time of No.1 andNo.2 is automatically set.

Caution: When the RX SW mode is set to “Forced” inprovisioning, RX SW manual control can selecteither No. 1 or No. 2 RX route though one isalarmed. Then, take care switching to avoid trafficinterruption.

RX SW Maintenance Mode

Indicates the RX SW mode status. When the RX SW mode is setto “Forced” in provisioning, “Forced” is displayed.

ATPC manual control:Used when it is required ATPC operation ON/OFFor the change of the transmitting power range inATPC operation.

TX mute: Turns off the transmitter output.

CW CONTROL (No.1/2):Used for transmitting a unmodulated carrier wave(CW). Used to confirm the TX frequency stability.

Main (CH) Loopback (NEAR END) (for E1 PDH):Used for distinguish equipment failure to MUXequipment or radio equipment. The input signalfrom MUX is looped back to the MUX. When noabnormality is found in the signal with NEAREND loopback, it is assumed that the radioequipment (IDU or ODU) has a problem.

Main (CH) Loopback (FAR END) (for E1 PDH):Used for distinguish equipment failure to MUXequipment or radio equipment. Signal is looped


5-8

back at the IDU of the opposite station. When noabnormality is found in the signal through FAREND loopback, it is assumed that the local radioequipment (IDU or ODU) has no problem.

LAN Device Reset (for LAN transmission only):Used for reset control to LAN interface Port 1 orPort 2.

**Linearizer Control:Sets Auto/Forced Reset of linearizer function.

Forced Reset: When the linearizer function is not used.

Auto: When the linearizer function is used.

DADE Adjust:Sets the DADE for Hot Standby SD/Twinpathconfiguration. Selects to make INTFC status In-phase.

Notes: 1. The DADE control applies in 1+1 configuration toadjust delay time for RX hitless switching when theINTFC status is indicated Outphase.

2. The DADE adjustment is needed in initial lineup orwhen the IF CABLE is replaced. It is not neededreadjustment when the INTFC status is indicated In-phase.

RF SUB Band select:Used for changing the ODU sub band for radiolink depending on the RF frequency assignment.

Antenna Alignment Mode:The Antenna Alignment Mode is used forextending the dynamic range of the PASOLINKMonitor unit. In order to measure in high range ofAGC V, it is mandatory required to set AntennaAlignment Mode to ON. If not it set to ON, theindicated AGC voltage is not guaranteed value.For the antenna orientation, set the TX power tothe required level by MTPC mode at the oppositesite.

Note: It is necessary to set to Antenna Alignment Mode whenmonitor the RX level with the PASOLINK Monitor unit.

** “NEO STD ODU (NHG) plus Compact IDU” only;“NEO Compact ODU (CPV) plus Compact IDU” notsupported.


5-9

5.1.3 Loopback

When loopback condition is necessary, set the system to loopbackcondition. (see Chart 5-1)

When there is an interruption of signals, use the PDH analyzers and isolatethe faulty section by checking the traffic signal by loopback. Setup the testequipment according to the following diagrams for PDH configuration.

Fig. 5-1 Loopback Diagram for Fault Isolation for PDH

U/BCONVDEMRX

B/UCONVMODTX

IDUODU

RECEIVING END

TX

RX

MOD

DEM

B/UCONV

U/BCONV

PDHANALYZER

PDHANALYZER

(Near End Loopback)

ODUIDU

TRANSMITTING END

MODEM MODEM ( ) E1 INTFC

SPEEDCONV

SPEEDCONV

SPEEDCONV

SPEEDCONV

( ) E1 INTFC

(Far End Loopback)PC


5-10

Chart 5-1 Loopback Control

Step Procedure


This chart contains:A. PreparationB. Main CH Loopback (Near End) Control (PDH)C. Main CH Loopback (Far End) Control (PDH)If loopback operation is performed, timing loop may occur (timing loop isdescribed in ITU-T Recommendation G.781).

Step Procedure

Caution: The Loopback control affects the radio link connection.

1. Loopback control operation is not performed at thesame time, or perform the Loopback reset controland perform either Loopback mode.• Near End Loopback• Far End Loopback

2. Loopback operation is not performed with anopposite station simultaneously.

A. PREPARATION

1 Set up the BER measurement, (refer to Fig. 5-3)

2 Connect the LCT port and the USB port with a USB cable, (seeFig. 2-2 in Chart 2-2)

3 Login LCT with User name “Admin” and Admin password,


5-11


Step Procedure

4 Click on the “Maintenance” button in “LCT MENU”,

5 Click on the “Maintenance1” menu,

6 Click on the control button “On” and click “Set” button, to set toMaintenance On mode,

7 For 1+1 configuration, switchover the TX SW and RX SW forthe channel is to be set loopback, (Refer to Chart 2-3 ManualSwitchover Operation (only 1+1 Configuration))

LCT MENU


Maintenance1Maintenance2


5-12


Step Procedure

For 16E1

8 Click on the “Select” button and click on the setting button“On” of the required CH#(s) to be loop back and click the“Execute” button,

For all E1 channel loop back, click on the “Select” button “On”in All Setting menu and click on the “Set” button,

Note: The control applies to loopback in each E1 signal.

Note: The Control is available for E1 channels set to used.

---Maintenance1---Item Value SettingMaintenance On Off On SetMain CH Loopback (Near End) Off SelectMain CH Loopback (Far End) Off Select

---Main CH Loopback(Near End)---

CH1-16CH1 On Off OnCH2 Off Off OnCH3 Disable Off OnCH4 Off Off OnCH5 Off Off On

lll

CH15 Off Off OnCH16 Off Off On

All SettingOff On Select Set Close


5-13


Step Procedure

Note: The Control is available for E1 channels set to used.

---Main CH Loopback(Far End)---

CH1-16CH1 On Off OnCH2 Off Off OnCH3 Disable Off OnCH4 Off Off OnCH5 Off Off On

lll

CH15 Off Off OnCH16 Off Off On

All SettingOff On Select Set Close


5-14

5.1.4 BER Measurement

Chart 5-2 BER Measurement

Apparatus:

Digital Multimeter with test leads

Screwdriver

PDH Analyzer (for PDH)

Headset

Step Procedure

A. 16E INTERFACE

Note: Pin connector facilities are necessary to connect the PDHanalyzer signal cable to D-sub connector.

Note: The BER measurement can not be performed for the channelwhich is set to Not Used or the channels shared with LAN.

1 At the transmitting end, disconnect 2M IN/OUT A, B on the16E1 INTFC (1+1)*/IDU (1+0) (see Fig. 5-2),

2 At the receiving end, disconnect 2M IN/OUT A, B on the 16E1INTFC (1+1)*/IDU (1+0) (see Fig. 5-2),

* 1+1 (1+0Ex)


5-15


Step Procedure

Fig. 5-2 BER Measurement (E1)

SELV


PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR


PULLG

IF IN/OUT

SELV

TXRX

PWRODUMD/CBL PWR

PULLG

LCT NMS NE


ALM

G

G



AUX/ALM

EOWCALL

MAINTODUIDUPWR

PWR

PULLFUSE -48V

SELV

125VDC/T7.5A

CPV16

PDH ANALYZER

No.1

No.2

TRANSMITTING END

16E1 INTFC

RECEIVING END

No.1

No.2

16E1 INTFC

Note: No.2 MODEM is not mounted in 1+0Ex.

2M IN/OUT A2M IN/OUT B

AUX/ALM

PDH ANALYZER

Connector facilities


SELV


PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR


PULLG

IF IN/OUT

SELV

TXRX

PWRODUMD/CBL PWR

PULLG

LCT NMS NE


ALM

GG

2M IN/OUT-A 2M IN/OUT-B

OW/SC/ALM2M IN/OUT-B2M IN/OUT-A




AUX/ALM

EOWCALL

MAINTODUIDUPWR

PWR

PULLFUSE -48V

SELV

125VDC/T7.5A

CPV16

AUX/ALM

OW/SC/ALM2M IN/OUT-B2M IN/OUT-A



5-16


Step Procedure

3 At both transmitting and receiving ends, set the BER test set asfollows:

Note: Operation of the TX SW and RX SW are not required in1+0 system for the following.

4 In HS system, set the TX SW to No.1 or No.2 to “On” conditionat transmitting end (refer to Chart 2-3),

5 At receiving end, set the RX SW to either No.1 or No.2 to “On”condition,

6 Measure BER at required CH and confirm that the values areindicated as follows:Requirement: 1 x 10–12 or less

Note: It can be measured only E1 CHs which are assigned to“Used (E1)” in provisioning.

7 At receiving end, change setting of the RX SW to opposite No.1or No.2 from it in step 5 and confirm that the measured valuesatisfies requirement as in step 6,

8 Change setting of the TX SW to opposite No.1 or No.2 from itin step 4 and confirm that the measured value satisfiesrequirement given in step 6,

9 At receiving end, change setting of the RX SW to opposite No.1or No.2 from it in step 7 and confirm that the measured valuesatisfies requirement given in step 6,

10 Restore all connections and controls to normal.

• For E1 Signal

• Bit rate: 2.048 Mbps• Code format: HDB3• Level/Impedance: 2.37 Vo-p (75 ohms, unbalanced) or

3.0 Vo-p (120 ohms, balanced)


5-17

5.1.5 Trouble Shooting FlowWhen alarm condition occurs, red alarm LEDs on the IDU are lit exceptwhen there is a power supply failure. Faults can be distinguished using theLED indicators on the front panel of the IDU. Connect the LCT to theequipment and check the equipment conditions in according with the flowchart are shown in Fig. 5-3 to Fig. 5-5.

Fig. 5-3 ODU TX Section Troubleshooting Flowchart

Is ODU ALM indicator (red) on the IDU lighted?

YES

IsIDU ALM indicator (red) on the IDU

lighted?

NO

YES

Areboth IDU and ODU ALM

indicators (red) flashing?

Check the IF cable connection and connectors whether the cable is open or short circuit.

YES

IsTX power of the ODU is

indicated normal?

YES

IsTX Input

indicated normal?

The IF cable type,

cable length and cable loss are used standard.

Change the IF cable to standard.

Is TX powervary with ATPC manual

control?

NO

Replace the ODU with a spare.

YES

Replace the ODU with a spare, if TX power alarm

continues when temperature is improved.

YES

IsAPC of the ODU is indicated

normal?

NO NO

YES


NO Is

ODU CPU is indicated normal?

Reset CPU of the ODU.

IsODU ALM is indicated

normal?

NO

Check the RX section of the ODU. End

YES

YESConnect the LCT to the IDU and check ALARM/STATUS menu. Check every items whether indicated status is alarm or normal.

NO

NO

YES


IsType Mismatch indicated

normal?

Replace the ODU with a NEO or

aNEO/c.

NO

YES


5-18

Fig. 5-4 ODU RX Section Troubleshooting Flowchart

Is ODU ALM indicator (red) on the IDU lighted?

YES

NO

YES

Areboth IDU and ODU ALM

indicators (red) flashing?

Check the IF cable connection and connectors whether the cable is open or short circuit.

Connect the LCT to the IDU and check ALARM STATUS menu. Check every items whether indicated status is Alarm or Normal.

IsRX Level

indicated Normal?

Is RXLEVEL byRSL monitor vary at random

interval?

Arefrequency value at

opposite site and local site correct?

NO

NO

YES

Check fading or interference.

YES

IsIDU ALM indicator (red)

lighted?

YES

YES

IsAPC of the ODU is indicated

Normal?

IsODU CPU is indicated

Normal?

Reset CPU of the ODU

IsODU ALM is indicated

Normal?

Replace the ODU with a spare.End

YES

NO

NO

YES

NO

Check Antenna system or Replace the ODU with a spare.

Set proper frequency.

NO

YES

IsODU TX section are

checked?

YES

NO

NO

Check the TX section of the ODU.


5-19

Fig. 5-5 IDU Section Troubleshooting Flowchart

IsPWR LED on

the MODEM(1+1)/the IDU(1+0)

lighted?

Is IDU ALM indicator(red)on the IDU Lighted?

IsODU ALM

Indicators(red)flashing?

Check the IF cableconnection and connectorswhether the cable is open

circuit.

Check the IF cableconnection and connectorswhether the cable is short

circuit.

IsMD/CBL ALM(1+1)

/IDU ALM(1+0)Indicators(red)

flashing?

Replace Fusein the

MODEM(1+1)/the IDU

Connect the LCT to the IDUand check Alarm Statusmenu.Check every items

whether indicated status isAlarm or Normal.

Is IDU ALMindicatedNormal?

End

C

IsMODEM Unequipped

indicatedNormal?

Check the MODEMmounted.

Check the MODEM Type

IsMODEM Type

mismatch indicatedNormal?

Replace the MODEM(1+1)/the IDU(1+0)With a spare

IsMODEM(Module)

indicatedNormal?


IsMOD

indicatedNormal?

IsLOF indicated

Normal?A

IsFRAME IDindicatedNormal?

Check the FRAME IDSet to the same with the

opposite site.

IsHigh BER/Low BER

indicatedNormal?

No failure of the equipment.

Propagation problem.

IsDEM

indicatedNormal?

The IF cable type,cable length and cable

loss are used standard.

IsCable EQLindicatedNormal?

B

IsODU indicated

Normal?

Change the IF cable tostandard.

Check the RX Sectionof the ODU

C

IsINTFC Unequipped

indicatedNormal?

Check the INTFC mounted.

INTFC

*1+1(1+0Ex)

IsINTFC Type mismatch

indicatedNormal?

Check the() INTFC Type

IsINTFC(Module)

indicatedNormal?

Replace the INTFC(1+1)/ the IDU(1+0)With a spare

IsInput LOS indicated

Normal?

IsAIS Received indicated

Normal?

Check associatedDTE at local site.

IsCH Usage indicated

Normal?Set CH Usage correct.

IsStatus of LAN

indicatedNormal?

Perform LAN device resetand check LAN cable or

associated externalequipment.

IsCTRL(Module)

indicatedNormal?

Replace the CTRL(1+1)/ the IDU(1+0)With a spare

C

IsTraffic interface cableConnected properly?

Check associatedDTE and cable connection.

Is75/120-ohm

Interface impedanceset property?

Set E1 port impedancecorrect.

IsODU indicated

Normal?

Check the RX Sectionof the ODU

A

Check the SystemConfiguration Setting

at opposite siteand local site.

B

C

IsInput Voltage

indicatedNormal?

Check Input Voltage atLocal site.


No

Yes

No

No No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

Yes

Yes Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

Yes

Yes

No

MODEM

*1+1(1+0Ex)

*1+1(1+0Ex)

Yes

CTRL

No

Yes

*1+1(1+0Ex)

*1+1(1+0Ex)


5-20

5.2 Replacement

The replacement procedures of the IDU and ODU is described below.

5.2.1 ODU Replacement

The procedures for replacing the ODU with a spare are given in the Chart5-3. The label attached to the side of ODU indicates the ODU type (seeFig. 5-6). To replace the ODU, prepare another ODU of the same type asindicated on the label of the failed one.

Check the name plate of the spare ODU. When the indicated items arecoincided, the ODU can be replaced.

Caution: Do not remove/connect the IF cable with the IDU powerON. Turn the IDU power OFF before connecting/disconnecting the IF cable, or equipment may be damaged.

Caution: To avoid microfonic properties, occurrence of bit errors,when installing the ODU on the HYB or OMT, protect theODU from mechanical knocks which is not be replaced.

Fig. 5-6 ODU Type and Frequency Indication Label

The mounting and demounting the ODU from/to antenna, refer to theInstallation and Initial Line up in Section III.

7/8/11 GHz ODU

FGIFLMONRX LEV

13-38 GHz ODU

-48VIFL RX LEV MON

TRP-15G-3BOUTDOOR UNITSHIFT FREQ 420MHz SUB BAND

(NWA-019615)

0.5ANEC Corporation MADE IN JAPAN

CAUTIONNon-ionizingradiation

PASOLINK NEO

SERIAL No.

0678(CPV)

TX LOW123456

- 48VWEIGHT 3kg /

TX FREQDATE

J14508MHz2007-10

TOKYO JAPAN

CAUTIONHOT SURFACEAvoid contact.


(NWA-019612)



-48V INPUTPower down IDU before disconnection or connection of cable.

PASOLINK NEO

SERIAL No.

0678(CPV)

TX LOW123456

- 48VWEIGHT 3kg /

TX FREQDATE

G7135MHz2007-10

TOKYO JAPAN

CAUTIONHOT SURFACEAvoid contact.


(NWA-009024)



-48V INPUTPower down IDU beforedisconnection orconnection of cable.

PASOLINK NEO

SERIAL No.

0678(NHG)

TX LOW123456

- 48VWEIGHT 4kg /

TX FREQDATE

A10713MHz2007-09

TOKYO JAPAN


5-21

Chart 5-3 ODU Replacement

Apparatus:T type hexagonal driver

Step Procedure

REMOVING

1 For 1+1 configuration, switchover the TX SW and RX SW forthe standby channel is to be replaced,

2 Turn off the power switch on the MODEM which is connectedto the ODU is to be replaced,

3 Remove the self-bonding tape from the IF IN/OUT connector,

4 Disconnect the IF cable from the IF IN/OUT connector on theODU,

5 Disconnect ground cable from the FG terminal on the ODU,

6 Loosen four bolts fixed the ODU with a T type hexagonaldriver,

7 Remove the ODU from the bracket,

FGIFLMONRX LEV

SCREWS

SCREWS

7/8/11 GHz ODU

IFCABLE

GROUNDCABLE

SCREWS

SCREWS

13-38 GHz ODUIF CABLE

-48V

IFL RX LEV MON

GROUNDCABLE


5-22


Step Procedure

MOUNTING

8 When the ODU is used for vertical polarization, rotate the ODUso that the plate marked V is on top,

Note: Remove the protection metallic plate covering the waveguidehole on ODU.

9 When the ODU is used for horizontal polarization, remove theguide pin fixed on the plate marked V,

10 Insert the guide pin removed in step 8 behind of the platemarked H,

11 Rotate the ODU so that the plate marked H is on top,

V POLARIZATION

PLATE MARKED V

UP

Guide Pin

-48V

IFL RX LEV MON

13-38 GHz ODUPLATE MARKED V

UP

FGIFLMONRX LEV

Guide Pin

11 GHz ODUV POLARIZATION


5-23


Step Procedure

12 Fit the spare ODU onto the bracket,

Note: Be careful not to damage the flange and O-ring.

13 Mount the spare ODU onto the bracket and tighten the fourscrews on the ODU,

14 Reconnect the IF cable to the IF IN/OUT connector on theODU,

15 Wrap twice the IF IN/OUT connector with self-bonding tape forwaterproofing. (see Fig. 5-7 (1/2) and (2/2))

16 Reconnect ground cable removed in step 4 to FG terminal,

17 Turn on the power switch on the IDU.

PLATE MARKED H

UP

Guide Pin

H POLARIZATION

-48V

IFLR

X LEV M

ON

PLATE MARKED H

UPFG

IFLM

ON

RX LEV

Guide Pin

H POLARIZATION

13-38 GHz ODU

11 GHz ODU


5-24

Fig. 5-7 Location of Connector for Waterproof (1/2)

POLE

ANT

7/8 GHz BAND

ODU

ODU

(*)

Note: * These parts should be wrapped by self-bondingtape for waterproof.

7/8 GHz BAND

self-bonding tape

stretch

Wrap twice the IF IN/OUT connector with self-bonding tape for waterproofing.

a half of tape width

ODU

twice

(*)

ODU

POLE

ANT

HYB


5-25

Fig. 5-7 Location of Connector for Waterproof (2/2)

IF CABLE

SELF-BONDING TAPE

ODU

Note: The self-bonding tape should be prepared by customer.

SELF-BONDING TAPE

ODU

IF CABLE

IN CASE OF L−ANGLE

ODU

CONNECTOR

self-bonding tape

stretch

Wrap twice the IF IN/OUT connector with self-bonding tape for waterproofing.

a half of tape width

ODU

twice

This part should be wrapped by self-bonding tape for waterproof.

-48V

IFL RX LEV MON

This part should be wrapped by self-bonding tape for waterproof.


5-26

5.2.2 IDU and Module Replacement

The procedures for replacing IDU/module with a spare are given in theChart 5-4.

Chart 5-4 IDU and Module Replacement

Caution: Persons performing maintenance must take necessary stepsto avoid electro-static discharge which may damage themodules or cause error. Wear a conductive wrist strapconnected to the grounded (G) jack on the front of theequipment shelf. This will minimize static build-up duringmaintenance. (see Fig. 2-1 in Chapter 2).

Caution: Do not remove/connect the IF cable with the IDU powerON. Turn the IDU power OFF before connecting/disconnecting the IF cable, or equipment may be damaged.

This chart contains:

A. Module replacementB. IDU replacement

Apparatus:Suitable Screwdriver

Step Procedure

A. MODULE REPLACEMENT

Note: Be careful do not touch the electric parts and printedcircuit on the module.

Note: The top surface of the IDU above MODEM is hot inoperation.

Note: The maintenance personnel should report startingreplacement from a station to the relevant station.

1 Referring to Chart 2-1, set the IDU to maintenance ONcondition by LCT,

2 For 1+1 configuration, switchover the TX SW and RX SW forthe standby channel from the working channel which is to bereplaced,


5-27


Step Procedure

Removing MODEM

3 When the MODEM will be replaced, turn off the power switchon the corresponding MODEM which is to be replaced,

4 Disconnect cables as following order,(1) Disconnect power supply cable from SELV connector.(2) Disconnect IF cable from IF IN/OUT connector. The

adapter is reused.(3) Disconnect ground cable from the ground terminal.

5 Loosen two screws on the MODEM module, (See Fig. 5-8)

6 Remove the MODEM module from the IDU shelf,

Mounting MODEM

1 When the MODEM is replaced, check that the power switch isset to Off position,

2 Align the MODEM to the shelf, then push it in until the multipinconnector firmly fits,

3 Tighten the two screws on the module,

4 Connect cables as following order,(1) Connect ground cable to the ground terminal.(2) Connect IF cable with adapter to IF IN/OUT connector.(3) Connect power supply cable to SELV connector.

5 Turn on the power switch on the MODEM,

6 Check that the MODEM is normal on the Alarm/Status display,

7 Check that the installed MODEM module exists in theINVENTRY list,

8 Check the operation of the replaced MODEM module,

9 Referring to Chart 2-1, set the IDU to maintenance OFFcondition by LCT.


5-28


Step Procedure

Removing 16E1 INTFC, CTRL


Note: When the CTRL is a failure, replace it with a spare asexplained below.

Note: When the CTRL is replaced without power OFF, refer to the“Replacing the CTRL Used MMC or LCT”.

2 Turn off the power switch (on the both MODEMs for 1+1configuration),

3 Disconnect all the cables connected to the module,

4 Loosen two screws on the module, (See Fig. 5-8),

5 Extract the module,

Note: Be careful not catch the module on the cable whenextracting the module. If the module caught on the livecables, it may be caused radio link error.

6 This work finishes.



5-29

Fig. 5-8 Demounting and Remounting Module

(Blank)

SELV


PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR


PULLG

LCT NMS NE


ALM

G

G

SELV


PROTECT

CALL MMC

MAINTMEMORY

IDU

IF IN/OUTTXRX

PWRODUMD/CBL PWR


PULLG

IF IN/OUT

SELV

TXRX

PWRODUMD/CBL PWR

PULLG

LCT NMS NE


ALM

G

G

1+0Ex SYSTEM

1+1 SYSTEMIDU

SCREW

SCREW

SCREWIDU

SCREW

MODEM ( )INTFC

CTRL

MODEM No. 1

MODEM No. 2 CTRL

( )INTFC


5-30


Step Procedure

Mounting 16E1 INTFC, CTRL


2 Turn OFF the power switch on the MODEM,

3 Check that the switch on the MODEM (both MODEM for 1+1configuration) is off position,

4 Align the module to the IDU shelf, then push it in until themultipin connector firmly fits,

5 Tighten two screws on the module,

6 Connect all cables to the module,

7 Turn on the power switch on the MODEM.

8 Check that the 16 E1 INTFC, CTRL is normal on the Alarm/Status display,

9 Check that the installed 16E1 INTFC, CTRL module exists inthe INVENTRY list,

10 Check the operation of the replaced 16E1 INTFC, CTRLmodule,

11 Click on the “Off” button of Maintenance and click on the “Set”button,

12 This work finishes.


---Maintenance1---Item Value SettingMaintenance Off Off On Set


5-31


Step Procedure

Replacing the CTRL Used the MMC or LCT.

This procedure is explained how to replace the CTRL used the MMC orLCT. This procedure is applied when the CTRL is not failure or when theequipment configuration data are saved into the MMC or LCT/PNMx.

Note: The NMS parameters (Network Config.) can not be restored, then,the resetup with the PNMx is required.

The Use of the MMC for the CTRL Replacement

When the MMC is used, the replacement can be performed without theLCT operation.(The resetup with the PNMx for the Network Config. isnecessary.)

1 Insert the MMC into the MMC slot on the CTRL front, (Thedata size to save is approximately 10 kbyte.)

2 Set the PROTECT SW on the CTRL front to ON position (forupper side). Then, the MAINT LED (amber) on the IDU is litand the equipment configuration data gather up and the savingof data to the MMC start,

3 When the equipment configuration data gather up and datasaving to the MMC has been completed, the MAINT LED onthe IDU blinks slowly, (Check that the MAINT LED blinksslowly when remove the CTRL.)

4 Remove the cables connected to the CTRL, loosen two fixedscrews and remove the CTRL,

Note: Be careful not catch the module on the cable whenextracting the module. If the module caught on the livecables, it may be caused radio link error.

5 Prepare the spare CTRL. Set the PROTECT SW on the spareCTRL to ON position (for upper side), (The PROTECT SWsetting distinguish the normal start up or protected start up.)Mount the CTRL into the IDU. Check that the MAINT LED onthe IDU blinks. Tighten two screws and connect cables removedin step 4.


5-32


Step Procedure

6 When the MAINT LED blinks, insert the MMC into the MMCslot on the CTRL front, which has equipment configuration dataused in the former CTRL,

7 The download of the equipment configuration data start, thedeployment is performed. When the CTRL has been madeprovision, MAINT LED on the IDU turns to light. Check thatthe MAINT LED lights and set the PROTECT SW to OFFposition (for lower side). Then, the equipment configurationdata deploys and data is restored.

8 In the Equipment Setup menu and the Provisioning menu,confirm that the equipment configuration and setting conditionsare the same as before replacement. Check that neither alarm isindicated in the Alarm Status.

9 The CTRL replacement finishes. Perform the resetup for theNetwork Config. since the Network Config. data is not restored.

AUX/ALMLCT NMS NE SC IN/OUT EOW

PROTECT

CALL MMC

MAINTMEMORY

IDU

PASOLINK NEO

MAINTE LEDMMC Slot

PROTECT SWCTRL

MMC

SCREWSCREW


5-33


Step Procedure

B. IDU REPLACEMENT

REMOVING

1 Turn off the power switch on the MODEM (1+1) (bothMODEMs in 1+1 configuration) or the IDU (1+0).

2 Disconnect the IF cable, signal cables and the power cable, etc.as following order,(1) Disconnect 16E1, LAN SC, Aux. signal cables from

connector.(2) Disconnect power supply cable from SELV connector.(3) Disconnect IF cable from IF IN/OUT connector.(4) Disconnect ground cable from the ground terminal

Note: The adapter for IF cable connector is reused.

3 As shown in Fig. 5-9 loosen four screws and remove the IDU,

MOUNTING

4 Fix the two brackets to desired position on the 1+1 IDU, ifnecessary (see Fig. 5-10),

5 Mount the IDU into the original position of the mounting rackand tighten the four screws,

6 Reconnect the IF cables, signal cables and the power cable tothe original position as following order,(1) Connect ground cable to the ground terminal(2) Connect IF cable (with adapter) to IF IN/OUT connector.(3) Connect power supply cable to SELV connector.(4) Connect 16E1, LAN SC, Aux. signal cables to proper

connector.

7 Form the wiring, and fix the cables using cable binder to themounting rack,

Notes: 1. Do not cross the cables on front of indicators and powerswitch used for maintenance.

2. Take suitable radius to wiring the IF cable. (e.g. 10D-FB: 70 cm)


5-34


Step Procedure


Fig. 5-9 Demounting and Remounting

Fig. 5-10 Bracket Mounting Position

SCREW

Note: Weight 4 kg (1+1)

Hot Surface

Caution: The top surface of the IDU aboveMODEM is hot in operation.

2.5 kg (1+0)

FRONT POSITION

CENTER POSITION

SIDE VIEW

FRONT POSITION

SIDE VIEW

1+1

1+0


5-35

5.2.3 Fuse Replacement

When the power is supplied to the SELV but the IDU can not be poweredon with the power switch, check the conduction of fuse in the MODEM(1+1) or the IDU (1+0).

Chart 5-5 1+1 IDU Fuse Replacement

Step Procedure

1 Set the power switch on the MODEM which is not powered toOff position,

2 Disconnect cables connected to the MODEM as followingorder,(1) Disconnect power supply cable from SELV connector.

(2) Disconnect IF cable from IF IN/OUT connector. The adapter is reused.

(3) Disconnect ground cable from the ground terminal.

3 Loosen two screws on the MODEM,

4 Extract the MODEM from the IDU shelf,

5 Remove protection cap over the fuse (see Fig. 5-11),

6 Remove the fuse from the fuse holder,

7 Check conduction of the broken fuse using tester,

8 Check conduction of the reserved fuse using tester,

9 Replace the broken fuse with reserved one,

10 Set the replaced fuse to the fuse holder,

11 Cap over the replaced fuse,

12 Mount the MODEM to the IDU shelf,

13 Tighten two screws on the MODEM,

14 Connect cables to the MODEM as reversed order in step 2,

15 Turn on the power switch on the MODEM,

16 Check that power is on.


5-36

Fig. 5-11 Fuse in the MODEM

Chart 5-6 1+0 IDU Fuse Replacement

Step Procedure

1 See the power switch on the IDU which is not powered to offposition.

2 Remove the fuse from the fuse holder.

3 Check conduction of the broken fuse using tester.

4 Check conduction of the reserved fuse using tester.

5 Replace the broken fuse with reserved one.



Reserve Fuse (6.3A)21606.3 FuseRKS-F91000-0107

(Front)

Fuse Cap

(MODEM)

RESERVE

1+0 IDU

SELVFUSEPWRSW


5-37

When the power is supplied to the SELV of the DC-DC CONV (optional)but the PWR LED of the DC-DC CONV is not lit though the power switchis on, check the conduction of the fuse in the DC-DC CONV.

Chart 5-7 DC-DC CONV Fuse Replacement

Step Procedure

1 Set the power switch on the DC-DC CONV which is notpowered to Off position

2 Disconnect cables connected to the DC-DC CONV as followingorder,(1) Disconnect power supply cable from SELV connector,(2) Disconnect power supply cable from −43/OUT connector,(3) Disconnect ground cable from ground terminal,(4) Disconnect ALM cable from ALM terminal,

3 Loosen two screws on the IDU/DC-DC CONV UNIT,

4 Extract the DC-DC CONV from the unit,

5 Put the screwdriver to the groove of the fuse holder and turnsthe fuse holder counter clockwise,

6 Remove the fuse from the fuse holder,

7 Check conduction of the broken fuse using tester,

8 Remove the reserved fuse as described in step 5,

9 Check conduction of the reserved fuse using tester,

10 Replace the broken fuse with reserved one,

11 Set the replaced fuse to the fuse holder,

12 Put the screwdriver to the groove of the fuse holder and push itinto the DC-DC CONV,

13 Turn the screwdriver clockwise until the fuse holder is lockedup, (When the fuse holder is locked up, the groove of the fuseholder is set to horizontal as shown in Fig. 5-12.)

14 Check and replace another fuse in the same way as from Step 5to Step 13,

15 Mount the DC-DC CONV to the unit,


5-3838 pages


Step Procedure

16 Tighten two screws on the DC-DC CONV,

17 Connect cables to the DC-DC CONV as reversed order in step 2,

18 Turn on the power switch on the DC-DC CONV,


20 Turn on the power switch on the IDU/DC-DC CONV UNIT,


Fig. 5-12 Fuse in the DC-DC CONV

Reserve Fuse (8A)GAB250V8 FuseCBE-006255-001

(Front)Fuse Holder

RESERVE RESERVE

CAUTION

HOT SURFACEAvoid contact.

!

Reserved Fuse

SELV

PWR PULL

PWRALMFUSE (250V/8AH)

− 43V

GOUTSTD

G

PWR Switch

SELV

PWR LED

ALM

−43V/OUT

FG

ScrewScrew

(DC-DC CONV)

Documents

NEC Pasolink Maintenance Manual