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Overview
This appendix describes the SC 553 DSU alarms:
Network OOF
Network LOS
Network AIS
Network USS
Network BPV
Network CRC
Network RYEL
Network LAD
Timing Loss
Cascade OOF
Cascade LOS
Cascade USS
Cascade AIS
Cascade BPV
Cascade CRC
Cascade RYEL
DCD Loss
DSR Loss
DTR Loss
External Tx Clock Loss (Channel External Transmit Timing Loss)
RxD No Transitions (Channel Receive Data No Transitions)
TxD No Transitions (Channel Transmit Data No Transitions)
EEPROM Checksum (Configuration Error)
Front Panel Test
Unit Failure
Unsolicited Test
Power Up
Config Change
Top Supply Fail
Bottom Supply Fail
Remote Not Responding
Redundant Mode
The DSU also accumulates alarm counts, which can be displayed by an SNMP controller. The
descriptions of the alarms that appear on the following pages treat the Network and Cascade alarm
conditions together. Both categories are concerned with conditions that affect T1 signalling.
076R155-000
Issue 7
Alarm Definitions
Appendix C:
(Network Out of Frame)
(Network Loss of Signal)
(Network Alarm Indication Signal)
(Network Unavailable Signal State)
(Network Bipolar Violations)
(Network Cyclic Redundancy Checksum)
(Network Received Yellow Alarm)
(Network Low Average Density)
(Loss of Transmit Timing Source)
(Cascade Out of Frame)
(Cascade Loss of Signal)
(Cascade Unavailable Signal State)
(Cascade Alarm Indication Signal)
(Cascade Bipolar Violations)
(Cascade Cyclic Redundancy Checksum)
(Cascade Received Yellow Alarm)
(Channel Data Carrier Detect Loss)
(Channel Data Set Ready Loss)
(Channel Data Terminal Ready Loss)
(Test Mode Commanded from Front Panel)
(Test Mode Commanded from STC)
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
C-1
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