Filter
Top Products
DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-601EXP-INTF (Expansion Interface Circuit Pack)
10
which contains this Expansion Interface circuit pack is in-service (up), the
Expansion Interface circuit pack is active; if it is out-of-service (down), the
Expansion Interface circuit pack is neither active nor standby.
e. This is the normal state for a Standby Expansion Interface circuit pack. It is
also the state of the TN570 Expansion Interface circuit pack immediately
after circuit pack initialization when the system has not yet assigned a role
to it (that is, Active or Standby). To distinguish between these two
situations, use the status system command. If the link which contains this
Expansion Interface circuit pack is in-service (up), the Expansion Interface
circuit pack is standby; if it is out-of-service (down), the Expansion
Interface circuit pack is neither active nor standby.
When testing Expansion Interface circuit packs to investigate problems, tests
should always be run on both circuit packs of an Expansion Link. This provides a
better indication of where a problem is located. Hardware errors for all Expansion
Interface circuit packs (EXP-INTF) may be displayed by using the category "infc"
on the Display Errors form.
In the EPN, the EPN TN775 Maintenance (MAINT) circuit pack monitors the sanity
of the Expansion Interface circuit pack. If the Expansion Interface circuit pack
should cycle between sane and insane several times, the Maintenance circuit
pack holds the Expansion Interface circuit pack reset. If a new Expansion
Interface circuit pack is installed in the EPN, the EPN Maintenance circuit pack
should be removed because it may attempt to hold the new Expansion Interface
circuit pack reset. The Maintenance circuit pack may be reinstalled after the
Expansion Interface circuit pack has been inserted and the Expansion Interface
circuit pack’s red LED has gone off.
The Active Expansion Link is also involved in synchronization between the two
cabinets. The Expansion Interface circuit pack reports slip errors if the two
cabinets are not correctly synchronized. When diagnosing synchronization
problems, the Expansion Interface circuit packs should be examined as a
possible cause.
Relationship Between Expansion Interface and
Tone-Clock Circuit Packs
The Expansion Interface fiber link depends on the system clock that is provided
by the Active Tone-Clock circuit pack on each network. (See TDM-CLK and
TONE-BD Maintenance documentation.) Each Expansion Interface circuit pack
transmits over the fiber at a rate derived from the system clock on its network. If
the Active Tone-Clock is defective to the point where the system clock frequency
it produces is out of the specified range ("out of spec"), an Expansion Interface
Link might go down even though the Expansion Interface circuit packs are
healthy. In a High or Critical Reliability system, both links could go down if there
is a defective Active Tone-Clock.