DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-780EXP-INTF (Expansion Interface Circuit Pack)
9
EXP-INTF (Expansion Interface Circuit
Pack)
!WARNING:

If the Expansion Interface (EI) circuit p ack you are troubleshooting is

associated with a Survivable Remote EPN (SREPN), before the SREPN can

be returned to normal servic e, all LAPD EI link problems must be cleared ,

and the SREPN slide switch on the TN2301 (located in the SRPPN carrier)

must be manually set to the normal position . See ‘‘Restoring Normal

Service to the SREPN’’ on page 9-788 in this section.

Refer also to

DEFINITY ECS Installation and Maintenance for Survivable Remote

EPN, Issue 1

, 555-230-102.
Following this introductory desc ription of the Expansion Interface (EI) circui t pack
are sections on the following top ics:
■‘‘EI In-Service Mechanism’’
■‘‘Survivable Remote EPN’’
■‘‘LEDs’’
■‘‘EI and Tone-Clock Interactions’’
■‘‘Replacing an EI Circuit Pack—Simplex PNC’’
■‘‘Replacing an EI Circuit Pack— Duplic ated PNC’’
■‘‘Expansion Interface Manual Loopb ack Procedure’’
The TN570 or the TN776 Expansion Interface (EI) Circuit Pack provides a TDM
and Packet bus to fiber inter face for the communication of sig naling information,
circuit switched connections, and pac ket switch connections b etween endpoints
residing in separate p ort networks. EI Circuit Packs are located in the Processor
Port Network (PPN) or in Expansion Port Networks (EPNs) and are connected via
optical fiber links. An EI can be connected to:
■Another EI (direct-connect c onfiguration)
MO Name (in
Alarm Log) Alarm
Level Initial Command to
Run1
1.
UU
is the universal cabinet nu mber (1 for PPN, 2 - 44 for EPNs).
C
is the carrier designation (A,
B, C, D, or E).
SS
is the number of the slot in which the circuit pack resides (01 to 21).
Full Name of MO
EXP-INTF MAJOR test board UUCSS s Expansion Interface Circuit Pack
EXP-INTF MINOR test board UUCSS s Expansion Interface Circuit Pack
EXP-INTF WARNING test board UUCSS s Expansion Interface Circuit Pack