als sdh xpic

1 ALS Copyright Siae Microelettronica s.p.a.

ALS

SDH Radio


Main items

1. ALS SDH radio system2. SCT3. LCT4. Troubleshooting


ALS : Family Overview

Mechanical Arrangement: Split Mount

Frequency Range: 6 to 38 GHz

Capacity: STM-1, 2xSTM-1, 4xSTM-1

Modulation schemes: 128 and 32 BCM

Interfaces: STM-1 Optical and Electrical

63XE1 (Expansion)

Fast Ethernet / Gigabit Ethernet

Configurations: Unprotected [1+0 2x(1+0)]

Protected (1+1) 2x(1+1) : HSB, SD, FD

1


Standard channel plans for STM-1, 2xSTM-1

and 4xSTM-1 transmission

STM 1 STM 1 2xSTM -1 2xSTM -1 3xSTM -1 4xSTM -1

32Q AM 128Q AM 128Q AM XPIC XPIC XPIC ITU-R

6L 14 01 F.3836U 14 02 F.3847 F.385A3

7U F.385A48 F.386A1

11 12 06 F.38713 12 02 F.49715 12 07 F.63618 12 03 F.59523 13 03 F.63725 13 02 F.74828 13 02 F.74832 01 02 F.152038 T/R12 01 F.749

Freq. Band (G hz)

CEPT ERC/REC

128QAM 128QAM

XPIC only


Indoor Unit

IDUs available :

1RU IDU for 1 or 2x STM1 1+0/1+1 and 4x STM-1 1+0

2RU IDU for 4xSTM-1 1+1

All IDUs are made up by LIM, RIMs and Controller

ALS System Modularity


Supported configurations:

1xSTM-1, 2xSTM-1 both unprotected and protected

4xSTM-1 unprotected only

1U IDU

LIM Line Interface Module- 2xSTM-1 or 4xSTM-1 interface- SDH Processor (STM-1, 2xSTM-1 Mux/Demux,

SOH bytes processing, Wayside and Service channels insertion/extraction, hitless switch)

Controller- TMN connection- Equipment Management

RIM1 Radio Interface Module- Power Supply Unit- FEC (encoder/decoder)- IF Cable Interface- Modem (32/128 BCM)- XPIC (if requested)

RIM2 Radio Interface Module(in 1+1)

ALS System Modularity1RU IDU - Layout


VV

56 MHz (128 BCM)

2xSTM-1

Unprotected 1xSTM-1 and 2xSTM-1

VV

28 MHz (128 BCM)

1xSTM-1

STM-1 #1 STM-1 #2

1U IDU1U IDU

1+0


VV

56 MHz (128 QAM)

2xSTM-1

Protected 1xSTM-1 and 2xSTM-1

VV

28 MHz (128 QAM)

1xSTM-1

1U IDU

STM-1 #1 STM-1 #2

1+1


VV

56 MHz (128 QAM)

2xSTM-1

Protected 1xSTM-1 and 2xSTM-1 S.1.1 OPTICAL interface LC connector, SFP

VV

28 MHz (128 QAM)

1xSTM-1

1U IDU

STM-1 #1 STM-1 #2

1+1


Unprotected 2xSTM-1Frequency reuse with Xpic

Towards Dual Pol. Antenna

VV HHTransceiver V

Transceiver H

HH

VV

1U IDU

2xSTM-1

28 MHz (128 BCM)

2xSTM-1


Unprotected 4xSTM-1Frequency reuse with Xpic

HH

VV

56 MHz (128 BCM)

4xSTM-1

1U IDU

4xSTM-1

Towards Dual Pol. Antenna

VV HHTransceiver V

Transceiver H


VV

2xSTM-1

56 MHz (128 BCM)

1xSTM-1 and 2xSTM-1 2+0

VV

1xSTM-1

28 MHz (128 BCM)

56 MHz (32 BCM)

1U IDU

1x STM-12x STM-1

1x STM-12x STM-1

Up to 4xSTM-1


Supported configurations:

1xSTM-1, 2xSTM-1, 4xSTM-1 both unprotected and protected

2U IDU

LIM Line Interface Module

Main Controller

RIM1 V Radio Interface Module

RIM1 H Radio Interface Module

RIM2 V Radio Interface Module

RIM2 H Radio Interface Module

ALS System Modularity

2RU IDU - Layout


Protected 4xSTM-1Frequency reuse with Xpic

2RU IDU

Dual Pol. Antenna

HH

VV

56 MHz (128 BCM)

4xSTM-1

V1V1 V2V2

H1H1 H2H2

4xSTM-1

Radio 1A

Radio 2A

Radio 1B

Radio 2B

Radio 1A

Radio 1B

Radio 2A

Radio 2B


Protected 4xSTM-1Frequency reuse withXpicFrequency diversity

2U IDU

Dual Pol. Antenna

Radio 1A

Radio 2B

Radio 1BRadio 2A

Radio 1A

Radio 1B

Radio 2B

Radio 2A

H1H1

V1V1

56 + 56 MHz (128 BCM)

4xSTM-1

H2H2

V2V2

protection

4xSTM-1

V1V1 V2V2

H1H1 H2H2


Outdoor Unit - Other characteristics

ATPC Automatic Transmitted Power Control

40 dynamic range with 1dB steps

RTPC Remote Transmitted Power Control

SW programmable, up to 40dB in 1dB steps


ATPC operation

Tx

Rx

Rx

Tx

PTx control

Local Remote

PTx control

Transmission of PTx control

P

Thresh High

Thresh Low

40 dB maxATPC range

PTx max.

PTx min.

Remote PRx(dBm)

Local PTx(dBm)

Hop attenuation (dB)

PTx min fixedPTx max defined by SCT


ALS XPIC (1)

INSTALLATION

- Double polarization antenna

- IDU-ODU cables = same length (max difference 1,5 m)

- RIM to RIM short cables F01693, 4 identical cables

- Set same RF channel for H and V polarisation

- Low ATPC level 15 dB higher than BER=10-6 threshold

- J0 shall be different on path H and V

Traffic Protection on manual operations on cross polar path


ALS XPIC (2)

Traffic Protection on manual operations on cross polar path :

- In case of Loop IF, Loop RF, RT-PSU off, Carrier onlyother manual operations are automatically activated (and shown into Manual Operation List), for example:

Loop RF Radio1A > Rim1A Xpic input disable (local radio),

Radio1A Tx off (remote radio).

Loop IF Radio1A > Rim1A Xpic Input Disable (local radio),

Radio1A Tx off (remote radio).

Carrier only Radio1A>Rim1B Xpic Input disable (remote radio).

RTPSU off Radio1A> Rim1B Xpic Input disable (local radio),

Radio1A Tx off (remote radio),

Rim1B Xpic Input disable (remote radio).

- A complete list of manual operations automatically activated are reported into ALS manual


ALS XPIC (3)

Autodiagnosis and Autoprotection of one traffic path for

1+0 systems in case of failure on the other path:

- Automatic distinction of internal alarms and external alarms (fading)

- Automatic activation of the Fault Management Procedure (FMP)

- In case of HW failure the transmitter of failed branch is switched off and all XPIC functionalities of the other path are switched off by FMP

- FMP decision is permanent until an operator reset

- The FMP can be disabled with a manual operation and after the programmable time out FMP is automatically enabled


Fault management procedureIn XPIC radio link where the two polarizations carry different signals,the problems on one polarization disturbs the otherFault Management Procedure (FMP) is used in XPIC 1+0 systems (2xSTM1 or 4xSTM1) to protect the traffic on a polarization against hardware failures occurred on the opposite polarization radio path.FMP distinguishes between external (e.g. fading) and internal alarmsand switches off automatically the alarmed path protecting the other:

Once the decision is taken, only an operator with SCT/LCT program orNMS5UX can reset the status.

FMP can activate the following manual operations: remote Tx off local Xpic disable disable FMP


Status of FMPXPIC enabled


System block diagram

RFCOH

RFCOH

24 ALS Copyright Siae Microelettronica s.p.a.LIM Tx


LIM Rx


RIM


RT

17,5 MHz

5,5 MHz


XPIC SYSTEMS

Transmissions on the same RF channel with ortogonal polarizations are possible using a XPIC circuit (Cross Polar Interference Canceller).System consists of two independent transceivers, each of them connected to one polarization of a cross polarized antenna: to delete interferences due to propagation cross polarization and to antenna XPD, the receivers include the XPIC, which cleans and combines the two received orthogonal signals in order to recover the two original.


In time domain, Rx IF signals are processed by demod and by orthogonal XPIC, are combined and are restored by a further decision circuit which improves radio hop C/I of 17 dB at least (depending on modulation used)

Base band adaptive canceller

Base band adaptive equaliser

XPIC CIRCUIT

30 ALS Copyright Siae Microelettronica s.p.a.41

LIM

STM-1

RSOH

SIM

RIMRFCOH

RT

RFCOH 176640 Kbit/sSTM-1 155 Mbit/s

STM-1Signal

RFCOH

Main Traffic (STM-1)

SOH Service Channels

RFCOH Service Channels

RFCOH Wayside capacity

Radio Frame Complementary OverHead

More Services Channels& Wayside Traffic

Media Specific Bytes only used for Radio surveillance purposes

All remaining SOH bytes free for national usage or for future International Std

SDH FRAME


Service Channels

1RU/2RU IDU

1x2Mbps G.703 per STM-1 (max 2) and 1xV.11 64Kbps

RJ45 10BaseT

SNMP AgentSNMP Agent

IP RoutingIP Routing

RS232 (PPP) STM-1 DCCs 1 or 2 (Radio Side 1 / 2)

ALS

Network Element

STM-1 DCCs (line side)

TMN communication ports

USB (PPP) for LCT

32 ALS Copyright Siae Microelettronica s.p.a.1

64Kbit/s

SOH Bytes structure

RSOH

MSOH


R S T mode : RSOH


A1, A2, J0If A1 and A2 are recognised by aligner and if J0 is the correct

one, RSOH bytes are extracted from SOH.

In case of:- no input (alarm is LOS)- failed recognition of A1,A2 (alarm is LOF)- J0 not correct (alarm is Path Trace Mismatch)

then:1. MS AIS signal is inserted on MSOH and on Payload2. Local restart is enabled


B1, D1, D2, D3, E1,

B1:Byte Interleaved parity: carries link quality info (relevant to G.826)

D1, D2, D3: DCC data communication channel for supervision and management (192 Kbit/s); DCC loss is reported by QECC alarm

E1 and 3X: bytes for EOW and low speed data channel


SCT2

An equipment can be managed by SCT, always.

In order to manage a whole link, following items must be prepared:

Port addressing and relevant subnet mask

Routing table

Remote elements table


IP addressing1B 2B 3B 4BIP4 Available bytes for IP addressing

Class AN H H H Address0

255 0 0 0 Subnetwork maskNumber of networks: 27 - 2 = 126 from 1 to 126Note: all o cannot be used as network address and number 127 (all 1) is reserved for loopback purposeNumber of hosts: 224 - 2 = 16774214 (host cannot assume all 0 or all 1 number)

Class BN N H H Address10

255 255 0 0 Subnetwork mask

Number of networks: 214 = 16384First octet from 128 to 191Number of hosts: 216 2 = 65534

Class CN N N H Address110

255 255 255 0 Subnetwork mask

Number of networks: 221 = 2097152First octet from 192 to 223Number of hosts: 28 - 2 = 254


Port addressesAll SIAE equipments, regarding SCT software and supervision, are routers: all interfaces need an address and relevant subnet mask

Addresses can be set clicking:

1. Set values

2. Store

3. Restart

Client (always)

In case of capacity bigger than 1xSTM-1, DCCs are 2 (indipendent)DCC2 = Disable for 1+0 and 1+1


RoutingALS ports and address definition with SCT using Unnumbered

LCT PPPIP address....Unnumbered...Net Mask............................

LAN

PPP RadioIP address......Unnumbered....Net Mask............................PPP Mode: Client

IP Ethernet IP addressLoc..........................Net Mask Loc..........................

LAN

IP Ethernet RIP address R..........................Net Mask R............................

PPP RadioIP address = Eth IPaddress Loc - 1Net Mask =Net Mask LocPPP Mode: Client

LCT PPPIP address...... Unnumbered...Net Mask............................

Remote element table (opt.) Remote element table (opt.)

Default GatewayDefault Gateway

NMS5UX


Routing table

Type and address of crossed port to

Destination

Type and address of crossed port to Destination

Netmask and IP address of

Destination

Default destination


Stored Routing TableThe Stored Routing Table adds routing lines, after a Restart, to

the running Routing Table of the NE.In this way we can change Ports addresses (operation that needs a

restart) without loosing a remote NE:1. In Stored Routing Table add the routing lines relevant to

new port addresses you are going to set2. Set the new port addresses (the equipment restarts)3. After the restart the equipment has new addresses and the

routing table already configured : NE management is still running


AgentThe Agent is used in the Network Element history to identify the alarmed equipment and inSubnetwork Configuration Wizard to visualize local and remote

Numeric identifier of the equipment

Agent:

local agent = local Ethernet IP address

remote agent = remote Radio IP address


Stations and equipmentsNEs connected to SCT can be assigned in various stations

using Subnetwork Configuration Wizard


Link management Prepare new network Send new configuration to local equipment Log as System on both equipments Retrieve the configuration of local equipment

Send new configuration to both equipments

Retrieve

Send/Reset


Alarm correlation

Every alarm is reported with Alarm beginning Alarm end (gravity info is maintained)


Alarm acknowledgementAlarm acknowledge is available in alarm history list: every

acknowledgement can be managed completely

in station list: new alarminfo is highlighted by an asterisk


Command loggerCmd Logger reads the list of operations, executed by the users, stored

on the controller of the equipment.The log, uploaded from equipment, is stored on the PC for further

consultations. Following filters are available: Operations date User address User type Operation name


Configuration upload/downloadUpload (from equipment)From Tool menu, open the proper TemplateSelect Upload operation and the equipment you want to upload information fromSave them in a file (*.cfg)Download (to equipment)From Tool menu, open the proper file (*.cfg)Select Download operation and the equipment you want to download information to

Uploaded parameters and *.cfg file are editable usingEquipment Configuration Wizard.


Configuration TemplateConfiguration template: it is relevant to equipment radio parameters as frequency, attenuation, capacity, thresholds,Address configuration template: it is relevant to management parameters as port IP addresses, routing tables, remote elements tables, OSPF.

Both configurations are necessary during first installation or when Controller module is substituted with a spare one: you can use a file to download or set every parameter manually.


Full backupThe whole amount of parameters (equipment parameters, address parameters and remote element table) can be uploaded from equipment, saved in a file (*.bku), downloaded to equipment.

These parameters cannot be editated.


Alarm summary panel

Manual Operation or Download

Active TX and RX

Configuration, Capacity, Protection

LCT

3


Configuration Manager


LASER Laser statusLaser module

In case of LOS (no Rx) Laser is automatically switched off

Manual test

Disable Tx laser is always ON (also in case of LOS) Auto every Auto restart Time a test is performed (2 sec. Laser on) Manual a test is performed (2 sec. Laser on) pushing Restart Test a test of Test Time sec. is performed


Early warning alarm threshold

Rx Power Low alarm threshold

Rx Alarms setting

55 ALS Copyright Siae Microelettronica s.p.a.Rx alarms and Rx switch

Actions to perform in case of

1+0

1+1


Tx switch

If both remote radios dont receive for more than alarm threshold sec. every check period sec. , on local side Tx switch is performed

57 ALS Copyright Siae Microelettronica s.p.a.Channel Arrangement

ACAP = Adjacent Channel Alternate Polarisation

ACCP = Adjacent Channel CoPolarisation

V or H V

H

V

H

ACAP ACCPCCDP

(With Xpic) CCDP = CoChannel Double Polarisation

Roll-off factor is modified to reduce overlappingnarrower


2Mbit/s and 64Kbit/s Wayside traffic

(F1 into RSOH) If = not mapped: F1-1 and F1-2 trasparent

If = STM1 RadioA, Frame1: F1-1radio side goes on V11 RJ45 and F1-2 trasparent

If = STM1RadioA, Frame2: F1-2 radio side goes on V11 RJ45 and F1-1 trasparent

If = Line1 or = Line2: F1 line side Line1 or Line2 goes on V11 RJ45.

One 2Mb stream for

each STM-1 available


XPIC 1+0


XPIC 1+0:General


XPIC 1+0 Configuration


RIM input disable


XPIC fault management


Synchronization (1)Synch. source

Source priority: 1Max 2min (2xSTM-1) 4min (4xSTM-1) disabled

Selected: available synch. with higher priority.Available: present and not degraded

Synch. status

White: not forcedBlue: forced

White: no alarmsRed: alarmed (drift and/or LTI)

White: no alarmsRed: alarmed

4xSTM-1


Internal clock

Clock source STM1-1 line side

Clock source STM1-2 line side

Synchronization (2)

2xSTM-1

Among enabled sources with the same priority and not alarmed, clock selection follows the numerical order


Synch sourceBad quality

Loss of Timing Input

Priority

Source forcing A disabled source cannot be selected

nor forced

67 ALS Copyright Siae Microelettronica s.p.a.STM-1 line side setting

J0 Trace Identifier Mismatch

Loss of Signal

Loss of Frame

AIS in Multiple Section

Remote Defective Indication in Multiple section

Low quality

Very low quality

Line enabled


Radio side setting


Command loggerCmd Logger reads the list of operations, executed by the users,

stored on the controller of the equipment.The log, uploaded from equipment, is stored on the PC for

further consultations. Following filters are available: Operations date User address User type Operation name


General preset: Tx switch to restore the link

If both remote radios dont receive, on local side Tx switch is performed


Fade Margin test


1) Fade margin : Remote link

Remote terminal must be declared as Remote link

In equipment 2 we want to perform Fade margin measurement


2) Fade margin : summary Input data : Expected F.M. (calculated by the customer directly,

basing on nominal output power and nominal LBER threshold) External Atten. : all the losses between radio and antenna (excluding

Branching) Curr. Step : four step (TXL1RXR1 , TXL1RXR2 , TXL2RXR1 , TXL2RXR2) Real F.M. : value based on expected F.M. adjusted with real output

power, real LBER threshold (and External Atten.) measured, and stored in the ODU, at SIAE final test department

Real F.M.v. : value calculated decreasing Local Output power (1 dB step) until Remote LBER alarm is ON. This value should be compared with declared one (Input data)


Feature Management


ALS LOOPS

M U X - D

E M U X

RF

E1 LOO P

BASEB AND LOO P

IDU

LOOP

R F

LO OPRI M 1 ODU 1

A L : avai lable loo ps

data direction: - toward s the equipment th at has enabled th e loop (baseband, IDU, RF)

MOD-DEM OD

M

U

X

-

D

E

M

U

X

STM1-1

STM1-2

Line side Radio side

LIM

MO-DEMBaseband loop

IDU loop

RF

RIM1 ODU1

IDU

RF loop

4


Loop timeout


Switching performance

500 ms


Rx Switching criteriaHigh priority

Low priority


Tx Switching criteria

Highest priority

lowest priority


Switch modes Auto

Preferential: operator can select which branch must be operative without alarms.Tx WaitTime time before coming back to the preferential branch when alarms disappear. In this way the controller doesnt switch continuously in case of fleeting alarms.Reset = Wait Time is not respected (immediately to Preferential)Full auto: both branches have same priority

Manual forcingOperator can select which branch must be operative despite alarms


Revertive

When a branch is declared preferential, the switch on opposite branch givesRevertive alarm.The return to the preferential branch, when available again, happens after Wait Time period (Tx only, remember Txswitch is not hitless).


Internal PRBS generator(Pseudo Random Bit Sequence)

P.R.B.S replaces the traffic on the STM-1 frame where it is connected. The P.R.B.S. connection is pointed out as Manual Operation. P.R.B.S. can be used only into the link.

Measures results and durationAlarm on analysed signal

Analysed STM-1

Measure status

Pattern type

Sync Los events during test


ALS loop: with external PRBS

STM1 loop line side: loop works with line enabled or not

STM1 loop radio side: loop works with line enabled on local side and on remote side

enabled


Alarm GroupingThis situation:

No signal fromremote


ALARMSThere are two directions of alarms: Tx and Rx Tx This line starts in LIM and arrives to output flange: when a situation of more alarms is occurring, the most significative alarm of them is at the beginning of Txchain, all the others after are due to this Rx This line starts in output flange and arrives to LIM: when a situation of more alarms is occurring, the most significative alarm of them is at the beginning of Rx chain, all the others after should be caused by this

Most Significant alarm

TxRIM

LIM

ODU

LIM

RIM

ODU

IDUIDU

Rx


Common group alarms


Plug-in module group


STM-1 alarms group


RIM alarms group


RT alarms group


SETS alarms group


STM-1 line side alarms STM-1 Los: loss of signal (no input), AIS is inserted on tributary lines (Tx). STM-1 Lof: loss of frame (failed recognition of A1,A2). Perform a STM-1 loop

and if alarm persists, replace LIM (Tx). STM-1 J0 Trace Identifier Mismatch: J0 received is not the expected one. AIS

inserted on VC12. Check configuration and network (Tx).In case of: LOS, LOF, J0 TIM

then:- MS AIS signal is inserted on MSOH and on Payload- Local restart is enabled

STM-1 B2 Signal Degraded: BER on MSOH B2 is higher than configured threshold. Check the network.

STM-1 B2 Excessive BER: HBER on MSOH B2. Check the network STM-1 MsAIS: AIS detected in input. Check the network. External fault. STM-1 MsRDI: K2 carries Remote Defect Indication in input from remote ADM.

External fault. STM-1 Qecc: ECC interrupted line side. Check radio link and IP addresses

settings.


STM-1 radio side alarms Bb SDH Proc. Stm1-x Tx Fail: Failure in Bb-Tx side STM-1 proc., replace LIM (Tx). Bb SDH Proc. Stm1-x LOS: loss of signal from RIM x (squelched?). Check branch

x (Rx level, cabling, RT alarms). If necessary replace LIM (Rx). Bb SDH Proc. Stm1-x LOF: loss of frame from RIM x. Perform a loop on branch x

and if alarm persists, check the branch, replace the LIM (Rx). Bb SDH Proc. Stm1-x B2 Signal Degraded: BER on SOH B2 higher than

configured threshold. Check branch x (Rx level, cabling, RT alarms). If necessary replace LIM (Rx).

Bb SDH Proc. Stm1-x B2 Excessive Ber : HBER from branch x. Check branch x (Rx level, cabling, RT alarms). If necessary replace LIM (Rx).

Bb SDH Proc. Stm1-x J0 Path Trace Mismatch: J0 received is not the expected one. Check configuration and network (Rx).

Bb SDH Proc. Stm1-x Ms Ais : AIS in MSOH, external alarm Bb SDH Proc. Stm1-x Ms Rdi : RDI in MSOH, external fault Bb SDH Proc. Stm1-x Qecc: ECC interrupted. Check radio link and IP addresses

settings. In case of no result restart the local terminal (software reset), again in case of no result restart the remote (remotely!).


1) RIM alarms RIM-x Unit Fail: replace RIM. RIM-x Unit Hw Mismatch: wrong unit, replace RIM. RIM-x Modulator Loss of Signal: no Bb-Tx. It can be caused by RFCOH processing.

This alarm causes RT-Tx alarms. Replace RIM (Tx). RIM-x Modulation Fail: Modulator damaged or Carrier only command active. This

alarm causes RT-Tx alarms. Replace RIM (Tx). RIM-x Demodulation Fail: Demodulator damaged. This alarm causes Baseband

alarm in Rx side and all quality alarms. Replace RIM (Rx). RIM-x Demodulator Loss of Signal: Dem Rx signal is missing (no 140 MHz from RT)

or squelched (bad propagation or no remote) Check Rx level, RT Rx alarms and cabling. This alarm causes Baseband alarm in Rx side. If necessary replace RIM (Rx).

RIM-x Demodulator Loss of Frame: loss of Rx signal FAW. Check Rx level, RT Rx alarms and cabling. This alarm causes Baseband alarm in Rx side. If necessary replace RIM (Rx).


2) RIM alarms RIM-x Demodulator EWL / LBER / HBER: quality of Rx signal. BER

higher than relevant configured threshold. They can be caused by Demodulator alarms (LOS and/or fail). Check Rx level and cabling and, in case of HBER, link status also (Rx).

RIM-x Modem ATPC Fail: ATPC info come from Demod, when its faulty info are missing and ATPC does not work. Replace RIM (Rx). RIM-x IDU-ODU Communication: check IDU-ODU cable. If necessary

replace RIM. RIM-x IDU-ODU Cable Open: no current through cable interface. Check

IDU-ODU cable RIM-x IDU-ODU Cable Short: overcurrent through cable interface. Check

IDU-ODU cable


1) RT alarmsRT-x Transmitter Unit Fail: replace RTRT-x Receiver Unit Fail: replace RTRT-x Oscillators Unit Fail: VCO is not lock. It can happen during frequency setting. If alarm persists, replace RT (Tx and Rx).RT-x Transmitter Unit Hw Mismatch: wrong unit. Replace RTRT-x Receiver Unit Hw Mismatch: wrong unit. Replace RTRT-x Oscillators Unit Hw Mismatch: wrong unit. Replace RTRT-x Cable Interface Unit Fail: check RIM-x. If necessary replace RTRT-x Cable Interface Unit Hw Mismatch: wrong unit. Replace RTRT-x Cable Interface Unit Sw Mismatch: replace RT


2) RT alarmsRT-x Cable Interface Unit Not Responding: no connection with RIM-x P. Check IDU-ODU cable-x. If necessary replace RTRT-x Power Supply: check RIM-x PSU. If necessary replace RTRT-x Receiver Rx Power Low: Rx power lower than configured threshold.Check propagation, remote Tx and hop calculation values. If necessary replace RT (Rx).RT-x Rx IF Out: no IF from receiver (or low signal level). It causes Rx alarms in IDU. Replace RT (Rx).RT-x Transmitter Power Low: Tx power lower than fixed threshold. Check commands (local Tx off or remote RF loop). It can be caused by VCO failureor by RT IF In alarm. If necessary replace RT (Tx)RT-x IF In: modulated IF from RIM is missing or very low. Check RIM-x. If necessary replace RT (Tx)

als sdh xpic

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