DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-781EXP-INTF (Expansion Interface Circuit Pack)
9
■ A DS1 Converter in a DS1 CONV Complex used to remote an EPN
■ A Switch Node Interface (center stage switch configuration)
■ A SREPN (Survivable Remote EPN)
In a Center Stage Switch configuration with duplicated Port Network Connectivity,
the PPN Expansion Interface circuit pack may be located in the Switch Node
Carrier (see Figure 9-40
). In these cases, the Expansion Interface circuit pack
and Switch Node Interface circuit pack may be connected via a metallic cable
instead of an optical fiber link. Metallic cable should be tested and replaced in
the same manner as the optical fiber.
A PPN-EPN connection can be extended through a DS1 CONV Complex. (See
Figure 9-41
). When discussing problems that may be related to fiber link
problems, the DS1 CONV will be considered part of the fiber link. If diagnosis of
the problem points to the fiber connectivity, and a DS1 CONV circuit pack is part
of this connectivity, problems with the DS1 CONV circuit pack should be
investigated (See DS1 CONV-BD Maintenance documentation). The DS1 CONV
circuit pack enters into diagnostics for the Expansion Interface circuit pack via
such tests as the Neighbor Query Test (#237), the Fiber Out-of-frame Test (#238),
the Two-way Transmission Test (#241), and the Packet Transmission Test (#589).
In critical reliability systems, the fiber link connections are duplicated as part of
Port Network Connectivity (PNC) duplication. In high reliability systems with a
Center Stage Switch and simplex Port Network Connectivity, a single point of
failure between the PPN and the Center Stage Switch is eliminated by duplicating
PPN EIs, the SNI s to which they connect in the Center Stage Switch, and the
fiber or metallic connections between them. These two connections normally
share the call processing load. In the event of the failure of one of these
connections, the load can be shifted to the operational link.
Figure 9-37
shows the location of the EI circuit packs in a typical simplex PNC,
direct connect configuration.
