TAP-107 : Trouble Clearing 363-206-285
Page 11 of 28 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
inc. DS1 sync. ref. EOOF MJ or MN Excessive out-of-frame (OOF) events were
detected in the DS1 synchronization reference
signal. Excessive OOF is defined as more than
512 out of frame events in one day.
Likely cause: Failure of the incoming DS1
synchronization reference signal.
inc. DS1 sync. ref. LOF MJ or MN The system is unable to frame on the DS1
synchronization reference signal.
Likely causes: Upstream failure in the clock
providing the reference signal; high bit error ratio
on the received signal, caused by failure of the
office timing supply that provides the DS1 timing
reference. The system is provisioned for SF format
on the specified DS1 synchronization reference
signal and the received DS1 signal is in ESF
format.
inc. DS1 sync. ref. LOS MJ or MN At least 128 consecutive zeros were received in the
DS1 synchronization reference signal or the energy
at the DS1 input is below a preset threshold.
Likely causes: Failure of the office timing supply
that provides the DS1 timing reference or failure of
the connection to the timing supply.
inc. DS1 sync. ref. OOL MJ or MN The incoming DS1 synchronization reference
signal is out-of-lock (OOL). The frequency of the
clock providing the DS1 reference signal is out of
specification.
Likely cause: Failure of the office timing supply
that provides the DS1 timing reference.
inc. (from DSX) DS3 AIS CR, MJ,
MN, or
NE ACTY
The system has detected DS3 alarm indication
signal (AIS) in the MUX direction (that is, coming
from the DSX) for the specified DS3 signal.
Likely causes: The incoming DS3 signal at the
near end is failed, or DS3 AIS is received from the
DSX-3 at the near end.
inc. (from fiber) DS3 AIS NE ACTY The system has detected DS3 alarm indication
signal (AIS) in the DEMUX direction (that is,
coming from the fiber) for the specified DS3 signal.
Likely causes: The incoming DS3 signal at the far
end is failed, or DS3 AIS is received from the
DSX-3 at the far end.
inc. (from DSX) DS3 LOS CR, MJ,
MN, or
None
At least 128 consecutive zeros were detected in
the DS3 signal received from the DSX-3.
Likely causes: Equipment failed or removed at
DSX-3, DS3 input disconnected at the DSX-3, or at
the DDM-2000 backplane.
TableB–RTRV-ALMMessageDescriptions(Continued)
Description
Alarm
Level Meaning
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