Maintenance Object Repair Procedures
555-233-123
10-762 Issue 4 May 2002
A system with EPN(s) may have one or two pairs of Expansion Interface circuit
packs connecting any two cabinets. If two pairs exist, one pair operates as the
Active pair and provides the required connectivity. The second pair acts as a hot
Standby. When a problem arises on the Active pair, the Standby pair may be
called upon to take over and provide continuous service with stable calls being
preserved. The Expansion Interface circuit packs must be inserted into fixed slots.
The valid slots for Expansion Interface circuit packs are: 1A01, 1A02, 1B01, 1B02,
2A01, 2A02, 2B02, 2B03, 3A01, 3A02, 3B02, or 3B03. It is also a requirement that
the fiber cables be connected according to the following table:
NOTE:
If Expansion Interface circuit packs are connected in any other way, they do
not function properly.
The Active Expansion Interface Link may be selected by system technician via the
set expansion-link PCSS command, where PCSS is the address of either
Standby Expansion Interface circuit pack. System Technician may prevent the
system from switching Expansion Interface Links by using the busyout board
PCSS command, where PCSS is the address of either Standby Expansion
Interface circuit pack. These two commands are described later in greater detail in
the “Expansion Interface Link Switch Command” section (located at the end of this
EXP-INTF Maintenance documentation).
A G3MT terminal connected to an EPN [G3i] provides the same maintenance and
administrative capabilities as the local administration terminal, but at a slower
transmission speed. The EPN Maintenance circuit pack also provides Emergency
Transfer and environmental monitoring functions for the EPN.
Table 10-287. Expansion Interface Circuit Pack Connections
EXP-INTF
in slot
connected to
EXP-INTF in slot Description
1A01 2A01 Network 1 to Network 2
1B01 2B02 Network 1 to Network 2 (Duplicated Link)
1A02
1
1 G3iV1.1-286 and G3iV2-386 only.
3A01 Network 1 to Network 3
1B02
1
3B02 Network 1 to Network 3 (Duplicated Link)
2A02
1
3A02 Network 2 to Network 3
2B03
1
3B03 Network 2 to Network 3 (Duplicated Link)
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