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EXP-INTF (Expansion Interface Circuit Pack)
Issue 1 June 2005 1189
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CAUTION:
CAUTION: If, after every link is restored, you suspect the problem might have been due to a
defective Tone-Clock circuit pack, switch to this Tone-Clock at an appropriate
time. If the Tone-Clock circuit pack was the cause of the problem and the same EI
circuit packs are in place, the same link(s) will go down again.
a. When the suspect Tone-Clock circuit pack resides in an in-service pot network (PN) with
duplicated Tone-Clock circuit packs:
Switch to the standby Tone-Clock in this PN. If the suspect Tone-Clock is defective, the
link(s) should be restored at this point. (Switching back to the defective Tone-Clock
should take the same link(s) out of service.) This Tone-Clock is defective and should be
replaced as soon as possible. If switching Tone-Clocks does not bring up the PN, then
this Tone-Clock is not the source of the problem. Be sure to switch back to the original
Tone-Clock.
!
CAUTION:
CAUTION: If a defective Tone-Clock circuit pack is left as the standby Tone-Clock, then a
scheduled Tone-Clock switch will cause the same link(s) go out of service again.
b. When the suspect Tone-Clock resides in an out-of-service PN:
Replace the active Tone-Clock circuit pack in this PN. In a PN with duplicated Tone-Clock
circuit packs, the active Tone-Clock’s amber LED is flashing. If both amber LEDs are
flashing, the active Tone-Clock’s LED is blinking slower.
!
CAUTION:
CAUTION: If a defective Tone-Clock circuit pack is left as the standby Tone-Clock, then a
scheduled Tone-Clock switch will cause the same PN to go out of service again.
If replacing this circuit pack restores the link(s), then the circuit pack should be replaced
as soon as possible. If not, then it was not the source of the problem.
Replacing an EI Circuit Pack—Unduplicated PNC
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WARNING:
WARNING: Do not power down a Switch Node carrier to replace a circuit pack.
!
WARNING:
WARNING: Replacing a Switch Node Interface, Switch Node Clock, Expansion Interface, or
DS1 Converter circuit pack in a standard-, duplex-, or high-reliability system
disrupts service. This service effect can range from an outage of a single PN to
an outage of the entire system.