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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-604EXP-INTF (Expansion Interface Circuit Pack)
10
4. Determine if the problem is due to a defective Active Tone-Clock circuit
pack. Refer to the preceding list of symptoms to decide which network
contains the suspect Active Tone-Clock. See Warning.
!
WARNING:
If you remove the EPN Expansion Interface circuit pack that is active
or that was active when the EPN was last in-service, then the 2A/3A
Tone-Clock circuit pack becomes the Active Tone-Clock. This
characteristic can be deceiving. Replacing or reseating the Active
EPN Expansion Interface circuit pack might restore the Expansion
Interface Links temporarily. However, if the 2B/3B Tone-Clock circuit
pack was really the source of the problem and not the Expansion
Interface circuit pack, then the Expansion Interface Link(s) goes
down again the next time a Tone-Clock switch to the 2B/3B
Tone-Clock is attempted (probably when the scheduled Tone-Clock
switch occurs).
!
WARNING:
If, after all the Expansion Interface Links are 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
Expansion Interface circuit packs are in place, the same Expansion
Interface Link(s) goes down again.
a. On a High or Critical Reliability system in which the network
containing the suspect Tone-Clock circuit pack is in-service:
Switch to the Standby Tone-Clock on this network. If the suspect
Tone-Clock circuit pack is defective, the Expansion Interface
Link(s) should be restored to service at this point. Switching back to
the defective Tone-Clock should make the same Expansion
Interface Link(s) go out-of-service. Such a Tone-Clock circuit pack
is defective and should be replaced as soon as possible. If
switching Tone-Clocks does not bring up the EPN, then this
Tone-Clock is not the source of the problem. Make sure to switch
back to the original Tone-Clock.
!
WARNING:
If the defective Tone-Clock circuit pack is left as the Standby
Tone-Clock, then a scheduled Tone-Clock switch causes the same
Expansion Link(s) to go out-of-service again.
b. On a system in which the EPN containing the suspect Tone-Clock
circuit pack is out-of-service: