Switch Node Interfaces

Description:

This article provides a general description of Switch Node Interface carriers.  This is a supplement to the article "Troubleshooting avCmAlmSysLinkMinor traps."

Steps:

Refer to Avaya Documentation "Avaya Aura® Communication Manager Alarms, Events, and Logs Reference" at https://support.avaya.com/css/secure/documents/101058057 under the heading "PKT-INT and System Reliability."

Switch Node Interface (SNI) carriers, associated SNI boards, Switch Node Clocks, DS1C boards and Switch Node carriers are the predecessor to connections between IPSI boards and associated G650 carriers.  Initially, they were connected to processor carriers and tone boards, but did not directly depend on the customer's IP network for connections to the Expansion Port Networks (EPN). Instead, they were connected by fiber to each EPN, or used DS1C boards to connect to remotely located cabinets.  The SNI carriers were mounted in refrigerator-sized cabinets along with separate carriers that handled DS1 boards, digital station circuit packs, discrete trunk boards, and auxiliary trunk circuit packs, usually connected to paging systems.  One of our customers still use a Switch Node arrangement to connect to other EPNs.

Here is a diagram of a single unduplicated Switch Node Interface carrier:

**A DS1 converter complex can provide connectivity to a remotely located port network. The DS1 converter complex consists of two TN574 DS1 converter (DS1C) circuit packs connected together with 1 to 4 DS1 facilities. The DS1C complex is administered as a fiber link.

Running the command "list fiber-link", you can see the connecting endpoints:

list fiber-link

                          FIBER LINK ADMINISTRATION

FIBER -------- ENDPOINT 1 -------- -------- ENDPOINT 2 --------
LINK# TYPE A-PNC DS1   B-PNC DS1   TYPE A-PNC DS1   B-PNC DS1   DS1
           LOC   CONV  LOC   CONV       LOC   CONV  LOC   CONV  CONV
                 LOC         LOC              LOC         LOC   TYPE

1     sni  01E02                   ei   01A01

3     sni  01E03                   ei   02A01

4     sni  01E19                   ei   03A01

5     sni  01E04                   ei   04A01

6     sni  01E18                   ei   05A01

7     sni  01E05                   ei   06A01

Manufacturer Release notes:

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