January 20, 2000
Equipped with T1 interface.
The UVM (Universal Voice Module) port will return a yellow alarm to the locally connected device, usually a Private Branch eXchange (PBX) or channel bank when the UVM port receives yellow alarm. Likewise, some PBXs detect yellow alarm and return yellow alarm. This combination results in a situation where neither the UVM port nor the PBX port can be cleared from the yellow alarm state without manual intervention by maintenance engineers.
If the PBX and IGX configurations are both set to Common Channel Signalling (CCS), this problem may appear when the channels on the PBX interface are manually put out of service, or when one of the channel Permanent Virtual Circuits (PVCs) terminating on the UVM fails.
This problem occurs only when the CCS feature is enabled via the cnflnsigparm command:
12 CVM & UVM Condition T1 Lines? [ YES]
This problem occurs only in 9.2.30 and earlier versions of 9.2. This problem does not occur in any 9.1 or earlier versions of software since the feature was not available in those releases. 9.3 software, currently unreleased and under development, has the fix for this problem.
This problem is caused by software. UVM card replacement will not resolve this problem.
Network users will not be able to establish calls through the affected T1 interfaces because the attached PBXs will busy out the channels on the T1 interfaces detecting yellow alarm.
Network maintenance staff will observe that the T1 line is stuck in yellow alarm. Yellow alarm is also known as Remote Alarm Indication (RAI) and is a standard T1 interface alarm. The alarm condition may be observed by executing the following commands and observing the resulting output:
igxnode TN StrataCom IGX 8430 9.2.23 Jan. 14 2000 16:26 GMT
Alarm summary (Configured alarm slots: None)
Connections Failed: None
TRK Alarms: 1 Major
Circuit Line Alarms: 1 Major <<-- Note Alarm State.
Physical Line Alarms: None
Cards Failed: None
Missing Cards: 2
Remote Node Alarms: 1 Major
Interface Shelf Alarms: None
FastPAD/Access Dev Alms: None
Last Command: dspalms
igxnode TN StrataCom IGX 8420 9.2.23 Jan. 14 2000 15:32 GMT
Line Type Current Line Alarm Status
9.1 T1/24 Major - Rmt Oof (YEL)
Major LN 23.1 Rmt Oof (YEL) 01/14/00 04:37:50
Attempts to clear the yellow alarm may fail.
The yellow alarm may be cleared by executing the following steps:
Delete connections delcon slot.port.channel
Down the line dnln slot.port
Reconfigure the lines cnfln slot.port
Disable the feature cnfclnsigparm 12 N
Upgrade to the next release of software 9.2.3x with the fix for this bug. As of the publication of this Field Notice, the bug (CSCdp59960) is resolved but not integrated into a release of 9.2 software. If you are a registered CCO user and you have logged in, you can use the hyperlink below to observe the status of this bug. Use the Bugwatcher feature available on CCO to obtain proactive email notifications of this bug`s status changes.
To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.
CSCdp59960 (registered customers only)
UVM does not send yellow-alarm to PBX when it receives a yellow-alarm from PBX
For More Information
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