Monitoring the DSU
4-10 7510-A2-GB20-10
November 1997
Network LEDs
496-1506
2
CTS (106)
OK
ALARM
TEST
DM
OOS
OOF
NS
TXD (103)
RXD (104)
RTS (105)
DTR (108)
NetworkSystem Port
red green yellow
DM – Data Mode:
ON – DSU (DDS network interface) is sending or
receiving data, or is in DMI condition
(all 1s being received).
OFF– DDS network interface is receiving CMI codes.
OOS – Out of Service:
ON – DSU is receiving out of
service code from the remote unit.
Refer to Table 4-2, Health and Status
Messages.
OOF – Out of Frame:
ON – DSU is detecting an out of frame
condition. Refer to Table 4-2, Health
and Status Messages.
NS – No Signal:
ON – DDS network interface detects
no signal. Refer to Table 4-2,
Health and Status Messages.