Demand test descriptions and error codes - Avaya Support

EXP-INTF (Expansion Interface Circuit Pack)
A PN-to-PN connection can be extended through a DS1 converter complex. (See
Figure 29: Fiber Link with DS1 Converter Complex). When discussing problems that may be
related to fiber links, the DS1 converter is considered part of the fiber link. If diagnosis of the
problem points to fiber connectivity and a DS1 converter circuit pack is part of the connectivity,
problems with the DS1 converter circuit pack should be investigated (see DS1C-BD (DS1
Converter Circuit Pack)). The DS1 converter circuit pack runs diagnostics for the EI circuit pack
via such tests as the Expansion Interface Neighbor Query Test (#237), the Expansion Interface
Fiber Out-of-Frame Query Test (#238), the Expansion Interface 2-Way Transmission Test
(#241), and the Expansion Interface Packet Interface Test (#589).
In a critical-reliability system, the fiber link’s are duplicated as part of PNC duplication. In a
high-reliability system with a CSS (Center Stage Switch) and unduplicated PNC, a single point
of failure between the server and the CSS is eliminated by duplicating each link, consisting of:
● SNI in the CSS to which the PN’s EI connects
● Physical fiber paths between them
These dual connections normally share the call-processing load. Should one of these links fail,
the entire load can be shifted to the operational link.
Figure 25: Direct Connect Configuration with Unduplicated PNC shows the location of the EI
circuit packs in a typical unduplicated PNC, direct connect configuration.
Figure 25: Direct Connect Configuration with Unduplicated PNC
Slot #
Slot #
Slot # 1 2 Slot # 1 2
E
I
2
E
I
2
PPN
CABINET 1
PORT CARRIER
PPN
CABINET 1
PORT CARRIER
FIBER LINKS
E E EPN
E E
EPN
I I CABINET 2 I I CABINET 3
CARRIER A CARRIER A
Each PN in a direct-connect configuration must be connected to the other PNs through a fiber
link. Each PN has one EI that functions as an Archangel. This EI must be connected with fiber
to an EI. If an EI is functioning as an Archangel (bus master), its amber LED will be flashing at a
rate of 2 seconds on and 200 ms off.
Issue 5 May 2009 427