COMSPHERE 3550 Series Data Service Units
C-2
July 1999
3550-A2-GB20-40
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.
Содержание Comsphere 3551
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Страница 129: ...Pin Assignments D 7 3550 A2 GB20 40 July 1999 Figure D 5 EIA 232 D Crossover Cable 4951 035F ...
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