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D Alarm Definitions
Overview
This appendix describes the DeskTop T1 DSU alarms that can appear
on the terminal interface Monitor screen Alarm Status display:
Network OOF
Network LOS
Network USS
Network AIS
Network BPVS
Network CRCS
Network RYEL
Network LAD
Config Error
Network Alarms
Network Out Of Frame
A Network Out Of Frame (NETWORK OOF) alarm event occurs
when the DSU misses two out of four framing bits in the signal coming
from the network. The front panel OOF indicator reflects the current
status of DSU-to-network synchronization.
Network Loss Of Signal
A Network Loss of Signal (NETWORK LOS) alarm event occurs
when the DSU senses an absence of network signal. The absence of
signal for a time equivalent to 175 bits (± 75) is considered no signal.
The front panel LOS indicator reflects the current status of the network
signal condition.
(Network Out of Frame)
(Network Loss of Signal)
(Network Unavailable Signal State)
(Network Alarm Indication Signal)
(Network Bipolar Violations)
(Network Cyclic Redundancy Checksum)
(Network Received Yellow Alarm)
(Network Low Average Density)
(Configuration Error)
GDC 048R154-000
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