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 (c enter stage switch config uration)
■A SREPN (Sur vivab le Rem ote EPN)
In a Center Stage Switch configuration with d uplicated Port Network Connec tivity,
the PPN Expansion Interface circuit pac k may be located in the Switch Node
Carrier (see Figure 9-40). In these cases, the Expansion Interface circ uit pack
and Switch Node Interfac e circuit pack ma y be connected via a metallic cable
instead of an optical fiber link. Metallic cab le should be tested and replaced in
the same manner as the optical fib er.
A PPN-EPN connection can be extended throug h a DS1 CONV Complex. (See
Figur e 9-41 ). When discussing p roblems that may be related to fiber link
problems, the DS1 CONV will be considered part of the fiber link. If d iagnosis of
the problem points to the fiber c onnectivity, and a DS1 CONV circuit pack is p art
of this connectivity, problems with the DS1 CONV circ uit pack should b e
investigated (See DS1 CONV-BD Maintenance doc umentation). The DS1 CONV
circuit pack ente rs into diagnostics for the Exp ansion Interface circuit p ack via
such tests as the Neighb or 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 sys tems, the fiber link connec tions are duplicated as part of
Port Network Connectivity (PNC) duplicati on. In high reliability systems with a
Center Stage Switch and simplex Port Network Connec tivity, a single point of
failure between the PPN and the Center Stage Switch is eliminated by duplic ating
PPN EIs, the SNI s to which they connect in the Center Stage Switch, and the
fiber or metallic connec tions between them. These two connec tions normally
share the call processing load. In the event of the failure of one of these
connections, the load c an be shifted to the op erational link.
Figur e 9-37 shows the location of the EI circuit packs in a typical simplex PNC,
direct connect c onfiguration.