Avaya S8700 Series, Руководство по обслуживанию, Страница: 1499 / 2618

EXP-INTF (Expansion Interface Circuit Pack)
Issue 1 May 2002 8-777 555-233-143
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:
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 port network (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:
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
!
WARNING:
Do not power down a Switch Node carrier to replace a circuit pack.
!
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.