Demand test descriptions and error codes - Avaya Support

EXP-INTF (Expansion Interface Circuit Pack)
MO Name in Log Alarm
Level
EXP-INTF MAJ
MIN
WRN
WARNING: If the Expansion Interface (EI) circuit pack that is being investigated is associated
with a Survivable Remote EPN (SREPN), every LAPD EI link problem must be
cleared, and the SREPN slide switch on the TN2301 (located in the SREPN
carrier) must be manually set to the normal position before the SREPN can be
returned to normal service. See Restoring Normal Service to the SREPN.
Refer also to Avaya MultiVantage Solutions Installation and Maintenance for Survivable Remote
EPN, 555-233-121.
Following this introductory description of the Expansion Interface (EI) circuit pack are sections
on the following topics:
● EI In-Service Mechanism
● Survivable Remote EPN
● LEDs
● EI and Tone-Clock Interactions
● Replacing an EI Circuit Pack—Unduplicated PNC
● Replacing an EI Circuit Pack— Duplicated PNC
● Expansion Interface Manual Loopback Procedure
The TN570 or the TN776 Expansion Interface (EI) circuit pack provides a TDM- and packet
bus-to-fiber interface for the communication of signaling information, circuit-switched
connections, and packet-switched connections between endpoints residing in separate PNs. EI
circuit packs are connected via optical fiber links. An EI can be connected to:
● Another EI, in a direct-connect configuration
Initial Command to Run Full Name of MO
test board location Expansion Interface
circuit pack
● A DS1 converter in a DS1 converter complex, used to remote a PN
● A Switch Node Interface (SNI), in a center stage switch (CSS) configuration
● A survivable remote EPN (SREPN)
In a CSS configuration with duplicated Port Network Connectivity (PNC), EI circuit packs reside
in the Switch Node Carrier (see Figure 28: Center Stage Switch Configuration with Duplicated
PNC). In this case, the EI and SNI circuit packs may be connected via a metallic cable instead
of an optical fiber link. Metallic cable should be tested and replaced in the same mer as optical
fiber.
426 Maintenance Alarms for Communication Manager, Media Gateways and Servers