363-206-305 Trouble Clearing:
TAP-107
Issue 3, June 2000 Page 9 of 22
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
forced switch ABN When associated with an OC-3/OC-12 line, this
message means that the identified line is not
selected as the active receiving line, and an
automatic or manual protection switch to make this
the active receiving line will not be done. The
forced switch will remain in effect until the
protection switch is reset, or a lockout or inhibit
switch request is received.
Note:
OC-3/OC-12 line switching is unidirectional.
Because of this, the specified OC-3/OC-12 line
might still be active (if the far end is selecting the
specified line to receive traffic), and the far end
might still be free to switch the line it is selecting to
receive traffic. (See the switch-line:
command.)
When associated with a FUNCTION UNITS slot or
a LOW SPEED service slot, this message means
that the identified equipment is not active, and an
automatic or manual switch to make it active will
not be done. The forced switch will remain in effect
until the protection switch is reset, or a lockout or
inhibit switch request is received. (See the
switch-fn: and switch-ls: commands.)
frequency error MJ This alarm condition indicates that an incoming
timing signal has an unacceptable frequency offset.
Likely cause:
A DS1 external timing reference to
the local shelf or a remote shelf has a frequency
offset greater than about 20 hertz.
holdover mode active NE ACTY System is in holdover synchronization mode.
Likely cause:
System was manually switched to
holdover mode (with switch-sync: command)
and switch has not been reset; or the system
automatically switched to holdover mode due to
failure of timing references, and either
(1) the reference failures have not cleared, or
(2) the system is provisioned for nonrevertive
synchronization mode switching, or
(3) the system is provisioned for External timing
and no external timing references are available, or
(4) the system is provisioned for loop-timed
operation and the optical line or OLIU circuit pack
has failed, or a message indicating an upstream
clock problem has been received on the sync
message bits of the optical line (rtrv-sync:
command) or
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level Meaning
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