Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
In Table 8-2 below, the Status Message column contains messages displayed by the CM4 Common
Modules in response to Status? inquiry. The Severity column classifies the relative importance of the
given condition.
Table 8-2. CM4 Status Messages
Status Message Severity Effect on System Function & Notes
TRANSMITTER USING
FTIME = INT
Minor Section supplied by
fallback clock should be
operational.
The addressed CM4 module's T1 transmitter is in its
internal fallback timing mode. This is due to bad signal
at input to one of drop-and-inserts or to failed primary
clock source.
TRANSMITTER CLOCK
FREE RUNNING
Minor Minor data errors
possible.
The addressed CM4 module's T1 transmitter has
dropped out of its primary timing mode (as above), but
cannot operate in its fallback timing mode. This may
be due to failed fallback clock source.
RECEIVE SIGNAL LOSS Major Communications
interrupted.
No signal is detected at the addressed CM4 module's
T1 input.
EXCESS JITTER Minor Minor data errors
possible.
Excessive jitter is detected at T1 input of the addressed
CM4 module.
RECEIVER OUT OF FRAME Major Data errors exist. The addressed CM4 module's T1 receiver has lost
frame synchronization.
OTHER SIDE (DI-A) IS OUT
OF FRAME
Major Data errors exist. The T1 receiver in the DI-A module has lost frame
synchronization. Only reported by a Common Module
set to DI-B mode.
RECEIVING ALL ONES Major Data traffic interrupted. An All-Ones Alarm (AIS - Alarm Indication Signal, or
“Blue Alarm”) is detected at the input of the addressed
common module. AIS is a DS1 signal containing only
1’s. This is specifically generated by equipment
external to MUX (such as SONET) and typically
denotes trouble with communication links between
nodes.
RECEIVING YELLOW
ALARM
Minor Data errors possible
elsewhere in the network.
A Yellow Alarm is detected by the addressed common
module’s input. Yellow Alarm is a message carried by
the overhead of T1. This is specifically generated by
equipment external to MUX and typically denotes
trouble with communication links. Unless forced,
MUX does not generate Yellow Alarm, but passes it
on.
PAYLD-LB = ON Information Data traffic is forced to
re-route.
The addressed CM4 module's T1 Payload Loopback is
active.
LINE-LB = ON Information Data traffic is forced to
re-route.
The addressed CM4 module's T1 Line Loopback is
active.
OTHER SIDE (DI-B) IS OUT
OF FRAME
Major Data errors exist. The T1 receiver in the DI-B module has lost frame
synchronization. Only reported by a Common Module
set to DI-A mode.
M-DACS-T1 RFL Electronics Inc.
October 25, 2004 8-15 (973) 334-3100
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