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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-652EXP-INTF (Expansion Interface Circuit Pack)
10
EXP-INTF (Expansion Interface
Circuit Pack)
!
CAUTION:
A detailed flowchart for isolating and resolving Packet Bus faults is included
in Chapter 9, "Packet Bus Fault Isolation and Correction". This flowchart,
along with the other information presented in the chapter, can help in
resolving problems relevant to the Packet Path of the TN570 Expansion
Interface. Whenever the repair procedures for this Maintenance Object
refer to Packet Bus and/or Packet Control maintenance, be sure to
reference Chapter 9, "Packet Bus Fault Isolation and Correction" in addition
to the relevant MO documentation.
The TN570 or the TN776 Expansion Interface circuit pack is used to provide
connectivity between the Processor Port Network (PPN) and either Expansion
Port Network (EPN) (network 2 or 3) or between the two Expansion Port
Networks. The TN776 Expansion Interface is used in G1 systems to provide
connectivity between the Processor Port Network and the (single) Expansion Port
Network. This connectivity is provided via a 32 Mbps fiber optic cable. The
TN776 supports circuit-switched connections and the control channel to and
from the EPN. The TN570 also supports packet-switched connections for those
systems that use the Packet Bus. The TN776 and TN570 circuit packs must only
be used in matched pairs. A TN776 circuit pack does not function if connected
via fiber to a TN570 circuit pack and vice versa.
The EPN(s), if present, are always under the control of the TN777 Processor
circuit pack in the PPN. Therefore, if the Expansion Interface circuit packs to the
EPN are not functioning correctly, service may be unavailable in that EPN, but is
available in the PPN. If the Expansion Interface circuit packs between EPNs are
not functioning properly, there is service in all networks, but connectivity between
EPN and EPN is not available.
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
1. Where P is the port network number 1, 2, or 3, C is the carrier designation (for example, A, B, C,
or D); and SS is the address of the slot in the carrier where the circuit pack is located (for example,
01, 02, ..., and so forth).
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
1
Full Name of MO
EXP-INTF MAJOR test board PCSS sh Expansion Interface Circuit Pack
EXP-INTF MINOR test board PCSS sh Expansion Interface Circuit Pack
EXP-INTF WARNING test board PCSS sh Expansion Interface Circuit Pack