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COMSPHERE 3550 Series Data Service Units
C-2 February 1995 3550-A2-GB20-10
Table C-1
DSU Status Indicators
Label
Color Description
OK Green Health and status indicator: DSU operation is normal. (The DSU has not
detected any of the faults listed under Alrm, below.)
This indicator flashes two times per second if a message from the NMS is
present.
Alrm Red Health and status indicator:
There is a fault in the local or remote DSU, DBM, or DDS facility, or there is a
corrupted configuration.
The following alarms at the local or remote DSU cause the Alrm status
indicator on the affected DSU to light:
Configuration Corrupt
Device Fault
Dial Tone Test Failure
DTR Alarm
Facility Alarm
MUX Failure
No Response
Redundant Power Alarm
Streaming Terminal
Subnetwork Alarm
Out-of-Frame Threshold
Out-of-Service
Test Yellow Active device (DSU or DBM) is either performing a test or other DSUs or DBMs
are in Test mode.
1
Dial Yellow DBM is active
Rapid flashing: Call setup in progress
Slow flashing: Call established but in Standby mode
Steady ON: Backup call established and active
TXD, RXD, RTS,
CTS, DSR, DTR,
LSD
Green Internal lead states at the DSU/DTE interface
(circuit designations)
:
Control circuit active
or
Data circuit SPACE(ing).
Front Panel
(Model 3551 only)
Yellow DSU is currently selected at the SDCP. (
The SDCP addresses one DSU at a
time.
)
1
The DSU or DBM is automatically put into Test mode when a remote DSU or DBM is performing a disruptive test (e.g.,
a Local Loopback (LL) at the control DSU. A DSU or DBM in Test mode has its DTE interface turned Off).
Table C-2
SDCP Status Indicators
Label
Color Description
OK Green Health and status indicator for the selected DSU; mirrors the OK indicator on
the DSU faceplate.
Alrm Red Health and status indicator for the selected DSU; mirrors the Alrm indicator on
the DSU faceplate.
BckUp Yellow Mirrors the BckUp LED on the selected DSU.
Test Yellow Mirrors the Test indicator on the selected DSU.
EC Green Error Correction indicator is for future use by dial network modems.