AXC Alarms

7/28/2019 AXC Alarms

http://slidepdf.com/reader/full/axc-alarms 1/66

Alarms for AXC

dn02166672Issue 1 en

© Nokia CorporationNokia Proprietary and Confidential

1 (66)

C33857.80.B0

Nokia AXC - ATM Cross-connect C2.0



The information in this document is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This document is intended for the useof Nokia's customers only for the purposes of the agreement under which the document issubmitted, and no part of it may be reproduced or transmitted in any form or means without theprior written permission of Nokia. The document has been prepared to be used by professionaland properly trained personnel, and the customer assumes full responsibility when using it.Nokia welcomes customer comments as part of the process of continuous development andimprovement of the documentation.

The information or statements given in this document concerning the suitability, capacity, or performance of the mentioned hardware or software products cannot be considered binding butshall be defined in the agreement made between Nokia and the customer. However, Nokia hasmade all reasonable efforts to ensure that the instructions contained in the document areadequate and free of material errors and omissions. Nokia will, if necessary, explain issueswhich may not be covered by the document.

Nokia's liability for any errors in the document is limited to the documentary correction of errors.NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENTOR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL (INCLUDING MONETARYLOSSES), that might arise from the use of this document or the information in it.

This document and the product it describes are considered protected by copyright according tothe applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this document may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Corporation 2003. All rights reserved.

Nokia FlexiHopper, Nokia MetroHopper, Nokia MetroHub, Nokia MetroSite and Nokia UltraSiteare trademarks of Nokia Networks Oy.

2 (66) © Nokia CorporationNokia Proprietary and Confidential


Alarms for AXC





9.11 61182 Far end block state 379.12 61183 Group timing mismatch 37

10 Interface protection alarms 39

10.1 61111 Interface protection unavailable 39

11 JT1 alarms 4111.1 61028 Loss of frame 4111.2 61029 Loss of signal 4111.3 61104 Excessive bit error rate 4211.4 61151 Alarm indication signal 4311.5 61152 Remote defect indication 44

12 JT2 alarms 4512.1 61028 Loss of frame 4512.2 61029 Loss of signal 45

12.3 61151 Alarm indication signal 4612.4 61152 Remote defect indication 47

13 NND alarms 4913.1 61250 Neighbour Node Discovery could not use VPI=0, VCI=21 49

14 STM-0/STM-1/Sonet alarms 5114.1 61028 Loss of frame 5114.2 61029 Loss of signal 5214.3 61101 Trace ID mismatch for regenerator section 5214.4 61102 Alarm indication signal for multiplexer section 5314.5 61103 Remote defect indication for multiplexer section 5414.6 61104 Excessive bit error rate 55

14.7 61105 Loss of pointer 5514.8 61106 Alarm indication signal for administrative unit 5614.9 61107 Path unequipped 5714.10 61108 Path label mismatch 5814.11 61109 Remote defect indication for virtual container 5814.12 61110 Trace ID mismatch for virtual container 59

15 Synchronisation alarms 6115.1 61058 Primary timing source lost 61

16 T1 alarms 6316.1 61028 Loss of frame 63

16.2 61029 Loss of signal 6316.3 61104 Excessive bit error rate 6416.4 61151 Alarm indication signal 6516.5 61152 Remote defect indication 66



Alarms for AXC



1 General information on AXC alarms

Same alarm numbers

The interfaces STM-1/STM-0/Sonet, E1, T1, JT1 and JT2 share the alarm

numbers for the following alarms:

" 61028: Loss of frame (STM-1/STM-0/Sonet, E1, JT1, T1 and JT2)

" 61029: Loss of signal (STM-1/STM-0/Sonet, E1, JT1, T1 and JT2)

" 61104: Excessive bit error rate (STM-1/STM-0/Sonet, E1, JT1 and T1)

" 61151: Alarm indication signal (E1, JT1, T1 and JT2)

" 61152: Remote defect indication (E1, JT1, T1 and JT2)

The alarms are listed and described separately for each interface in the alarm

documentation.

Alarm time

Each AXC alarm will contain a time stamp that is derived from the current AXC

system time. It is recommended to connect the AXC to an NTP server in order to

make sure that the system time is always accurate. If no NTP server is available,

the system time can also be configured manually. However, the time settings will

be lost in case of a restart.

Alarm handling

The AXC features a "current alarm list" that stores all active alarms. For sending

the alarm and cancelling messages online via the DCN to the Nokia NetAct system, an alarm buffer holding up to 20 alarms is implemented. Typically, the

buffer is empty during operation because all messages can be sent after a short

waiting period. If the connection to NetAct is disturbed or interrupted completely,

the buffer is slowly filled with messages that cannot be transmitted, and finally,

the alarm "890 Alarm Buffer Overflow" is generated. Once the connection has

been recovered, the messages stored in the alarm buffer including the before

mentioned alarm will be sent out. Nokia NetAct reacts to this alarm with a



5 (66)

General information on AXC alarms



deactivation of the online alarm notification process and performs an alarm

upload from the AXC in question. This upload will request the entries of the

current alarm list. After this, the alarm information in Nokia NetAct is up to date

again and the online alarm notification process can be reactivated.



Alarms for AXC





Figure 2. STS-1/STS-3c alarm hierarchy

E1 alarm hierarhcy

The following figure illustrates the E1 alarm hierarchy. If LOS is generated, all

other alarms below it are not generated.

Figure 3. E1 alarm hierarchy

LOS

LOF

LOCD

MS-RDI MS-AIS AU-AIS

AU-LOP

HP-UNEQ HP-RDI HP-PLM HP- TIM EBER

LOS

AIS

LOF/ LOMF

LOCD RDIEBE



Alarms for AXC



T1/JT1 alarm hierarchy

The following figure illustrates the T1/JT1 alarm hierarchy. If LOS is generated,

all other alarms below it are not generated.

Figure 4. T1/JT1 alarm hierarchy

JT2 alarm hierarchy

The following figure illustrates the JT2 alarm hierarchy. If LOS is generated, all

other alarms below it are not generated.

Figure 5. JT2 alarm hierarchy

LOS

AIS

LOF

LOCD RDIEBE

LOS

AIS

LOF

RDI



9 (66)

AXC alarm hierarchies



IMA link hierarchy

The following figure illustrates the IMA link hierarchy.

Figure 6. IMA link hierarchy

IMA group hierarchy

The following figure illustrates the IMA group hierarchy.

Physical Layer defect

LIF

LODS

RFI_IMATx_Unusable FE Rx_Unusable FE



Alarms for AXC



Figure 7. IMA group hierarchy

For further information on alarms seeReference

/ Alarms

.

Start-up-FE

Config-Aborted

Config-Aborted FE

GR_Timing Mismatch Insufficient Links

Insufficient Links FE

Blocked FE



11 (66)

AXC alarm hierarchies





Alarms for AXC



3 AAL2 alarms

3.1 61260 STC connection to signalling peer notestablished

Severity

Major

Fault reason

The signalling transport converter link is down.

Probable root causes:

" the peer releases the connection by sending an END PDU

" the link goes down because the peer does not respond within the

TIMER_NO_RESPONSE period

" the link was never established

" the physical link is down

Description

Alarm text: STC connection to signalling peer not established

Comments: This alarm can be activated/deactivated in the AAL2 settings window

of the AXC Manager. The default is "activated".

Instructions

Check if any other alarms related to the fault are on. If this is the case, follow the

instructions of that alarm. If no other alarms related to the fault are on, check the

configuration of the peer.



13 (66)

AAL2 alarms



Cancelling

The system cancels the alarm automatically when the fault has been corrected.



Alarms for AXC



4 ATM alarms

4.1 61057 Loss of cell delineation on ATM interface

Severity

Major

Fault reason

Loss of ATM cell delineation. The network interface receives frames in which

ATM cells cannot be recognised. There are disturbances in the traffic of the

physical transmission link in question, or the traffic has been completely

prevented.

Note

This alarm is not raised on interfaces of type JT2.

Description

Alarm text: LOCD on slot $S, port $P

Comments: LOCD is declared when a number of consecutive incorrect HEC

bytes has been received. Available for SDH/Sonet/E1/JT1/T1.

Instructions

Check if any other alarms related to the fault are on. If this is the case, follow the

instructions of that alarm. If no other related alarms are on, the problem is

somewhere in the transmission network, and it should be investigated. If the

alarm is on only temporarily, no action is needed.



15 (66)

ATM alarms



Cancelling


4.2 61070 ATM interface disabled

Severity

Warning

Fault reason

ATM interface disabled. The alarm is raised when the operational state changes to

disabled. The alarm is always sent simultaneously with the root cause alarm. Thiscan be LOS, LOF, AIS, RDI, LOCD.

Note

This alarm is not raised on interfaces which are connected to the BTS (CIF).

Description

Alarm text: ATM interface disabled on slot $S, port $P

Comments: The alarm is raised when the operational state of TCTT goes to

disabled. If an IMA interface is disabled, the $P information signifies IMA group

ID.

Instructions

Check the related physical layer alarm. Follow the instructions of that alarm.

Cancelling




Alarms for AXC







Fault reason

Version mismatch. This alarm is raised when the version of the BTS AXC

communication protocol could not be agreed yet. This alarm appears during BTS/

AXC start-up and it is typically only temporarily active.

Description

Alarm text: Version mismatch

Instructions

If the alarm remains active, restart either the BTS or AXC.

Cancelling


5.4 61301 Fan unit defect

Severity

Major

Fault reason

Equipment malfunction. The alarm is raised if one of the two fans of the S-AXC

cartridge's fan unit is defect.

Description

Alarm text: Fan unit defect

Instructions

Replace the defect fan unit by a new one as soon as possible.

Note

The correct operation of an S-AXC with a defect fan cannot be guaranteed for a

long period of time within its upper operational temperature range.



19 (66)

AXC system alarms



Cancelling


5.5 61302 Running low on memory

Severity

Major

Fault reason

Out of memory. This alarm is raised when only 1 MB RAM is left on the AXU.

Description

Alarm text: Running low on memory on slot $S

Comments: Memory shortage on an AXU (slot 1 or slot 6).

Instructions

1. Switch unnecessary PM counter off

2. Reduce the number of cross-connection

Cancelling




Alarms for AXC



6 CES alarms

6.1 61190 Cell loss

Severity

Warning

Fault reason

Cell loss. This alarm is raised when cells are continuously lost.

Description

Alarm text: Cell loss on slot $S, port $P

Instructions

Check if any other alarms concerning the fault are on. If this is the case, follow

the instructions of that alarm. If not, check the dimensioning of the used ATM

traffic descriptors and the CES interworking function.

Cancelling


6.2 61191 Buffer underflow Severity

Warning

Fault reason

Buffer underflow. This alarm indicates a buffer underflow of the CES

reassembling function. There can be several root causes:



21 (66)

CES alarms



" large cell delay variation

" clocking differences between the nodes

Description

Alarm text: Buffer underflow on slot $S, port $P

Instructions


the instructions of that alarm. If not, check the dimensioning of the used ATM

traffic descriptors and the CES interworking function.

Cancelling




Alarms for AXC



7 E1 alarms

7.1 61028 Loss of frame

Severity

Critical

Fault reason

Loss of frame.

Probable cause: The interface type has not been properly configured.

Description

Alarm text: LOF on slot $S, port $P

Comments: LOF is declared when three consecutive incorrect frame alignment

signals have been received according to [G.706].

Instructions

Check if the configured interface type matches the configured interface type of

the far end interface. If this is the case, the problem is somewhere in the

transmission network, and it should be investigated. If the alarm is only

temporarily on, no action is needed.

Cancelling




23 (66)

E1 alarms



7.2 61029 Loss of signal

Severity

Critical

Fault reason

Loss of signal.

Probable cause:

" a cable is cut

" the signal is strength is not sufficient

" the equipment failed

" the interface of the far end is switched "OFF"

Description

Alarm text: LOS on slot $S, port $P

Comments: LOS defect is detected when the incoming signal has no transitionsaccording to [G.775]. All other transmission alarms related to this signal are

suppressed.

Instructions

Check that the cables are connected to the correct connectors. Check if the

interface of the far end is switched "ON". If the alarm remains active, the problem

is somewhere in the transmission network, and it should be investigated.

Cancelling


7.3 61104 Excessive bit error rate

Severity

Critical



Alarms for AXC



Fault reason

Excessive bit error rate. The measured bit error rate exceeds the configured

threshold value (BER-3 or BER-6).

Probable cause: The signal level is too low, the receiver or transmitter has failed

or an item of other equipment has failed along the line.

Description

Alarm text: BER on slot $S, port $P

Comments: Threshold alarms related to CRC-4 errors: configurable either to

BER-3 or BER-6.

Instructions


the instructions of that alarm. If no other alarms concerning the fault are on, the

problem is somewhere in the transmission network, and it should be investigated.

If the alarm is on only temporarily, no action is needed.

Cancelling


7.4 61150 Loss of multiframe

Severity

Critical

Fault reason

Loss of multiframe. The interface has lost CRC alignment.

Description

Alarm text: LOMF on slot $S, port $P

Instructions

Check that the other end of the link has CRC in use. In addition, use the same

instructions as in case of a loss of frame alignment alarm to locate the fault.



25 (66)

E1 alarms



Cancelling


7.5 61151 Alarm indication signal

Severity

Major

Fault reason

Alarm indication signal. The alarm signal is received, the received signal has no

framing and it is all ones.

Description

Alarm text: AIS on slot $S, port $P

Comments: AIS defect is detected when the incoming signal has two or less zeros

in each of two consecutive double frame periods (512 bits) according to [G.775].

Instructions

The signal is cut somewhere in the network and AIS replacement has taken place.

Follow the signal in the network to find out the place where AIS replacement hasoccurred. This link is usually faulty or has configuration errors. Other alarms may

cause this alarm because of AIS switching in the receiving direction.

Cancelling


7.6 61152 Remote defect indication

Severity

Major

Fault reason

Remote defect indication. Sent by the equipment in the far end (timeslot 0/bit 3).

It indicates a serious fault in the received signal of the far end equipment.



Alarms for AXC



Description

Alarm text: RDI on slot $S, port $P

Comments: RDI defect is detected when the incoming signal has the Remote

alarm indication bit set to binary 1 for z consecutive double frame periods

according to [G.775].

Instructions




If the alarm is only temporarily on, no action is needed.

Cancelling




27 (66)

E1 alarms





Alarms for AXC



8 HW/SW alarms

8.1 61200 Unit type mismatch

Severity

Critical

Fault reason

Unit mismatch. A wrong type of plug-in unit has been inserted into a subrack slot,

a unit has been inserted into an unused slot or the slot has been configured to

expect an other unit.

Description

Alarm text: Unit type mismatch in slot $S

Instructions

Ensure that the expected unit has been properly configured. If this is the case,

plug a unit into the related slot which suits the configuration.

Cancelling


8.2 61201 Unit missing

Severity

Critical



29 (66)

HW/SW alarms



Fault reason

Unit missing. The slot has been configured to hold a unit but the plug-in unit is

not physically present in the slot.

Description

Alarm text: Unit missing in slot $S

Instructions

Plug in a proper unit or replace the defect unit with a new one. Follow the

instructions in the user manual for replacing plug-in units. If the slot shall not

hold a unit, uninstall the unit with the Nokia AXC Manager.

Cancelling


8.3 61202 SW version mismatch

Severity

Critical

Fault reason

SW version mismatch. The SW of the unit plugged into the AXC node does not

fit to the overall AXC SW version.

Description

Alarm text: SW version mismatch in slot $S

Instructions

Replace the unit with a unit holding the right software version or execute asoftware update.

Cancelling




Alarms for AXC



9 IMA alarms

9.1 61170 Loss of IMA frame

Severity

Critical

Fault reason

Loss of IMA frame. The loss of the IMA frame detected in one link of the IMA

group. There are traffic disturbances or traffic of the IMA group is completely

cut. The LIF defect is the occurrence of persistent OIF (out of IMA frame)

anomalies for at least 2 IMA frames.

Description

Alarm text: Loss of IMA frame on slot $S, port $P

Instructions

Check the PDH layer alarm. If the alarm is only temporarily on, no action is

needed.

Cancelling


9.2 61171 IMA link out of delay synchronisation

Severity

Critical



31 (66)

IMA alarms



Fault reason

Link out of delay synchronisation. A LODS defect is reported when the link

differential delay between the Tx timing link and the other links in the group has

exceeded the tolerable link differential delay.

Description

Alarm text: IMA link out of delay synchronisation on slot $S, port $P

Instructions

Check the differential delay time setting. If the IMA links are transported via

different transmission paths this could be the reason for this alarm.

Cancelling


9.3 61172 IMA remote failure indication

Severity

Major

Fault reason

Remote failure indication. IMA related remote defect detected. Traffic of the IMA

group does not function properly.

Probable causes:

" physical link defect

" loss of IMA frame

" loss of delay synchronisation

Description

Alarm text: IMA remote failure indication on slot $S, port $P

Instructions

Check PDH layer alarms. If the alarm is on only temporarily, no action is needed.



Alarms for AXC



Cancelling


9.4 61175 Transmit link unusable

Severity

Major

Fault reason

Transmit link unusable. The far end reports that the transmitted signal is

unusable.

Description

Alarm text: Transmit link unusable on slot $S, port $P

Instructions





Cancelling


9.5 61176 Receive link unusable

Severity

Major

Fault reason

Receive link unusable. The far end reports that the received signal is unusable.

Description

Alarm text: Receive link unusable on slot $S, port $P



33 (66)

IMA alarms



Instructions





Cancelling


9.6 61177 Far end group start-up

Severity

Warning

Fault reason

Far end group start-up. This alarm is raised when the far end indicates that it is in

start-up phase.

Description

Alarm text: Far end group start-up on slot $S

Instructions

Typically this alarm is on only temporarily, no action is needed. If the alarm stays

active, check if any other alarms related to this fault are on. If this is the case,

follow the instructions of that alarm. If no other alarms concerning the fault are

on, the problem is somewhere in the transmission network.

Cancelling


9.7 61178 Configuration abort state

Severity

Warning



Alarms for AXC



Fault reason

Configuration abort state. This alarm is raised when the far end tries to use

unacceptable configuration parameters.

Description

Alarm text: Config-abort state on slot $S

Instructions

Check the configuration on near end and far end fit together. If needed, change

the configuration accordingly.

Cancelling


9.8 61179 Far end configuration abort state

Severity

Warning

Fault reason

Far end configuration abort state. This alarm is raised when the far end reports

unacceptable configuration parameters.

Description

Alarm text: Far end config-abort state on slot $S

Instructions

Check the configuration on near end and far end fit together. If needed change the

configuration accordingly.

Cancelling




35 (66)

IMA alarms





Cancelling


9.11 61182 Far end block state

Severity

Major

Fault reason

Far end block state. The far end IMA group reports that it is blocked. The IMA

group is out of use.

Description

Alarm text: Far end blocked state on slot $S

Instructions

The current IMA group configuration is out of use. It must be re-configured with

acceptable parameters.

Cancelling


9.12 61183 Group timing mismatch

Severity

Major

Fault reason

Group timing mismatch. The far end transmit clock mode is different from the

near end transmit clock mode. The traffic of the IMA group does not function

properly.

Description

Alarm text: Group timing mismatch on slot $S



37 (66)

IMA alarms



Instructions

The current IMA group configuration is out of use. It must be re-configured with

acceptable parameters using the Nokia AXC Manager.

Cancelling




Alarms for AXC



10 Interface protection alarms

10.1 61111 Interface protection unavailable

Severity

Minor

Fault reason

Interface protection unavailable. The protecting interface is not able to protect the

working interface or the protection switch has failed.

Description

Alarm text: IFP: Service not available on slot $S, port $P

Comments: $S, $P refers to the protecting interface.

Instructions

Check if any other alarms on the physical layer are on. If this is the case, follow

the instructions of that alarm. Check if the multiplex section protection (MSP)

version of the far end is compatible with MSP 1:1 (MSP 1:n).

Cancelling




39 (66)

Interface protection alarms





Alarms for AXC



11 JT1 alarms


Severity

Critical

Fault reason

Loss of frame.


Description


Instructions



transmission network, and it should be investigated. If the alarm is on only

temporarily, no action is needed.

Cancelling

The system cancels the alarm automatically when the alarm has been corrected.


Severity

Critical



41 (66)

JT1 alarms



Fault reason

Loss of signal.

Probable cause:

" a cable is cut

" the signal strength is not sufficient



Description


Comments: All other transmission alarms to this signal are suppressed.

Instructions




Cancelling



Severity

Critical

Fault reason



Probable cause: The signal level is too low, the receiver or transmitter has failed,

an item of other equipment has failed along the line.



Alarms for AXC



Description

Alarm text: EBER on slot $S, port $P

Instructions





Cancelling



Severity

Major

Fault reason

Alarm indication signal. Alarm signal is received, the received signal has no


Description


Instructions


Follow the signal in the network to find out the place where AIS replacement has

been done. This link is usually faulty or has configuration errors. Other alarms

may cause this alarm because of AIS switching in the receiving direction.

Cancelling




43 (66)

JT1 alarms




Severity

Major

Fault reason

Remote defect indication. Sent by the equipment in the far end. It indicates a

serious fault in the received signal of the far end equipment.

Description


Instructions





Cancelling




Alarms for AXC



12 JT2 alarms


Severity

Critical

Fault reason

Loss of frame.

Probable cause: The interface type of the connected equipment differs from JT2.

Description


Comments: LOF is declared when seven consecutive incorrect frame alignment

signals have been received [G.706].

Instructions

Check if the interface type of the far end equipment is JT2. If this is the case, the



Cancelling



Severity

Critical



45 (66)

JT2 alarms



Fault reason

Loss of signal.

Probable cause:

" a cable is cut

" the signal strength is not sufficient



Description


Comments: LOS defect is detected when the incoming signal has no transitions

according to [G.775]. All other transmission alarms related to this signal are

suppressed.

Instructions




Cancelling



Severity

Major

Fault reason

Alarm indication signal. The alarm signal is received, the received signal has no


Description




Alarms for AXC



Instructions


Follow the signal in the network to find out the place where AIS replacement has

been done. This link is usually faulty or has configuration errors. Other alarms


Cancelling



Severity

Major

Fault reason

Remote defect indication. Sent by the equipment in the far end. It indicates a

serious fault in the received signal of the far end equipment.

Description


Instructions





Cancelling




47 (66)

JT2 alarms





Alarms for AXC



13 NND alarms

13.1 61250 Neighbour Node Discovery could not useVPI=0, VCI=21

Severity

Minor

Fault reason

The Neighbour Node Discovery (NND) is not able to use VPI-0 and VCI-21 on

an ATM Interface. The channel might be used for other purposes than NND.

Description

Alarm text: NND could not use VPI=0, VCI=21 on slot $S, port $P

Comments: This alarm is raised when NND is not able to reserve resources

required for operation. These include internal cross connection and SAR channel.

Instructions

If possible, reconfigure the existing channel so that it can be used for NND. If this

is not possible, switch the NND functionality for this particular interface "off".

Cancelling




49 (66)

NND alarms





Alarms for AXC



14 STM-0/STM-1/Sonet alarms


Severity

Critical

Fault reason

Loss of frame in the regenerator section. The SDH interface receives frames

which have an incorrect frame pattern (A1 and A2 bytes). There are disturbances

in the traffic of the SDH transmission link, or the traffic has been completely

prevented.


Description


Comments: Frame alignment is deemed to have been lost when two consecutive

FAS are detected in error (i.e. 1 error in each FAS). Frame alignment is deemed to

have been recovered when one non-errored FAS is found [G.783]

Instructions


the far end interface. If this is the case, the problem is somewhere in thetransmission network, and it should be investigated. If the alarm is on only


Cancelling




51 (66)

STM-0/STM-1/Sonet alarms




Severity

Critical

Fault reason

Loss of signal at the optical interface.

Probable cause:

" A cable is cut

" the optical signal strength is not sufficient


" the laser on the far end interface is switched "OFF"

Description


Comments: LOS is considered to have occurred when the amplitude of the

relevant signal has dropped below prescribed limits for a prescribed period

[I.432-2]. All other transmission alarms related to this signal are suppressed.

Instructions

Check that the fibres are connected to the correct connectors. For SDH/Sonet

interfaces, check that the laser of the far end is switched "ON". If the alarm

remains active, the problem is somewhere in the transmission network, and it

should be investigated.

Cancelling


14.3 61101 Trace ID mismatch for regenerator section

Severity

Major



Alarms for AXC



Fault reason

Regenerator section trace ID mismatch. The incoming SDH signal has a different

regeneration section trace identifier than expected. This should mean that the

SDH signal of the interface is not originating from the expected source. The

traffic on the interface does not work.

Note

This alarm is not raised on Sonet interfaces.

Description

Alarm text: TIM (regenerator section) on slot $S, port $P

Instructions

Check the incoming and expected regenerator section traces with the Nokia AXC

Manager (J0). If the expected trace is correct and it still differs from the incoming

one, there are problems with the configuration. Check that the SDH fibres are

connected to the correct connectors. If those are connected correctly the problem

is in the trace configuration of the SDH equipment from which the signal is

originating.

Cancelling


14.4 61102 Alarm indication signal for multiplexer section

Severity

Major

Fault reason

Alarm indication signal (MS). The SDH/Sonet interface receives an MS-AIS

(multiplexer section alarm indication signal) signal. The signal is cut, or faulty

frames have been received on the SDH/Sonet transmission link. There are traffic

disturbances on the SDH/Sonet transmission link, or the traffic is completely

congested on the link.



53 (66)




Description

Alarm text: AIS (multiplexer section) on slot $S, port $P

Comments: The multiplexer section AIS (MS-AIS) is specified as all 1s in the

entire STM-1, excluding the STM-1 RSOH [G.707]. MS-AIS is asserted when a

111 binary pattern is detected in bits 6, 7 and 8 of K2 byte [G.783].

Instructions


the instructions of that alarm. If no other alarms on concerning the fault are on,

the problem is somewhere in the transmission network, and it should be

investigated. If the alarm is on only temporarily, no action is needed.

Cancelling


14.5 61103 Remote defect indication for multiplexer section

Severity

Major

Fault reason

Remote defect indication (MS). This alarm occurs when the equipment at the far

end of a bidirectional multiplexer section connection has detected an error

condition on the signal that it is receiving from this node. The far end equipment

signals this remote defect in the signal that it transmits to this node.

Description

Alarm text: RDI (multiplexer section) on slot $S, port $P

Comments: When the bit 5 of G1 field is set to 1 [G.707].

Instructions







Alarms for AXC



Cancelling



Severity

Critical

Fault reason



Probable cause: The signal level is too low, the receiver or transmitter has failed,

an item of other equipment has failed along the line.

Description


Instructions


the instructions of that alarm. If no other alarms concerning the fault are on, the problem is somewhere in the transmission network, and it should be investigated.


Cancelling


14.7 61105 Loss of pointer

Severity

Critical



55 (66)




Fault reason

Loss of administrative unit pointer. This alarm occurs when SDH/Sonet interface

receives frames which have an incorrect AU (Administrative Unit) pointer. There

are disturbances in the traffic of the SDH/Sonet transmission link in question, or

the traffic has been completely prevented.

Description

Alarm text: LOP on slot $S, port $P

Instructions



problem is somewhere in the transmission network, and it should be investigated.If the alarm is on only temporarily, no action is needed.

Cancelling


14.8 61106 Alarm indication signal for administrativeunit

Severity

Major

Fault reason

Alarm indication signal (AU). The SDH/Sonet interface receives an AU-AIS

(administrative unit - alarm indication signal) signal. Frames with a faulty AU

pointer have been detected on the SDH/Sonet transmission link. There are

disturbances in the traffic of the SDH/Sonet transmission link in question, or the

traffic has been completely prevented.

Description

Alarm text: AIS (administrative unit) on slot $S, port $P



Alarms for AXC



Instructions





Cancelling

Do not cancel the alarm. The system cancels the alarm automatically when the

fault has been corrected.

14.9 61107 Path unequipped

Severity

Major

Fault reason

Higher order path unequipped. The path signal label byte (C2) and the path trace

byte (J1), and BIP-8 byte (B3) in the SDH/Sonet path overhead (POH) all have

the value zero. The path is unusable for the traffic transport.

Probable cause: The unequipped virtual container (VC) comes from a VC level

cross-connection node and the VC is not connected anywhere in that node.

Description

Alarm text: UNEQ on slot $S, port $P

Instructions




It can also be the case that the network element where the SDH/Sonet path isoriginating is not correctly configured. If the alarm is only temporarily on, no

action is needed.

Cancelling




57 (66)




14.10 61108 Path label mismatch

Severity

Major

Fault reason

Higher order path payload label mismatch. The SDH/Sonet interface receives

frames, which have a signal type identifier that does not correspond to the "ATM"

(Asynchronous Transfer Mode) signal.

Description

Alarm text: PLM on slot $S, port $P

Instructions

Ensure that the path payload label on the far end interface has been set to "ATM".





Cancelling


14.11 61109 Remote defect indication for virtual container

Severity

Major

Fault reason

Remote defect indication (VC). This alarm occurs when the equipment at the far end of a bidirectional VC connection has detected an error condition on the signal

that it is receiving from this node. The far end equipment signals this remote

defect in the signal that it transmits to this node.

Description

Alarm text: RDI (virtual container) on slot $S, port $P



Alarms for AXC



Comments: The MS-RDI is used to return an indication to the transmit end that

the received end has detected an incoming section defect or is receiving MS-AIS.

MS-RDI is generated by inserting a 110 code in positions 6, 7 and 8 of the K2

byte before scrambling [G.707].

Instructions





Cancelling


14.12 61110 Trace ID mismatch for virtual container

Severity

Major

Fault reason

Virtual container trace identifier mismatch. The incoming SDH/Sonet signal has a

different path trace identifier than expected. This should mean that the SDH/ Sonet path is not originating from the expected source. The traffic on that SDH/

Sonet path does not work.

Description

Alarm text: TIM (virtual container) on slot $S, port $P

Instructions

Check the incoming and expected path traces with the Nokia AXC Manager (J1).

If the expected trace is correct and it still differs from the incoming one there are problems with the configuration. Check that the SDH/Sonet fibres are connected

to the correct connectors. If those are connected correctly the problem is in the

trace configuration of the SDH/Sonet equipment from which the signal is

originating or there are configuration problems in the SDH/Sonet transmission

network.

Cancelling




59 (66)






Alarms for AXC



15 Synchronisation alarms

15.1 61058 Primary timing source lost

Severity

Critical

Fault reason

Primary timing source lost. The first synchronisation source from the configured

priority list is unavailable. On failure the AXC switches automatically to the next

clock source in the priority list. When the primary timing source is available

again, the AXC switches back to it.

Description

Alarm text: Primary timing source lost

Instructions




Cancelling




61 (66)

Synchronisation alarms





Alarms for AXC



16 T1 alarms


Severity

Critical

Fault reason

Loss of frame.


Description


Instructions



transmission network, and it should be investigated. If the alarm is on only


Cancelling



Severity

Critical



63 (66)

T1 alarms





Description


Comments: Threshold alarms related to CRC-6 errors: configurable either to

BER-3 or BER-6.

Instructions





Cancelling



Severity

Major

Fault reason

Alarm indication signal. Alarm signal is received, the received signal has no


Description


Instructions


Follow the signal in the network to find out the place where AIS replacement has been done. This link is usually faulty or has configuration errors. Other alarms


Cancelling




65 (66)

T1 alarms



Documents

AXC Alarms