
Monitoring the DSU
6-3
7612-A2-GB20-00
June 1997
System LEDs
496-15062
CTS (106)
OK
ALARM TEST
DM
OOS
OOF
NS
TXD (103)RXD (104)R
TS (105)
DTR (108)
Network
System
Port
red
green
yellow
OK:
ON – DSU is operational.
OFF – DSU has detected a system failure, or there is
no power.
ALARM:
ON – DSU has detected an alarm condition locally or from
the network. Refer to
Troubleshooting
in Chapter 8.
TEST:
ON – Test in progress. Test can be initiated locally, remotely,
or from the network. Includes power-up self-test.