Avaya S8700 - Page 2107

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SNC-BD (Switch Node Clock Circuit Pack)

Issue 1 May 2002

8-1385555-233-143

The SNC circuit packs are associated with three MOs:

■ The ‘‘SNC-BD (Switch Node Clock Circuit Pack)’’ MO covers general SNC

board errors and errors with the serial communication channel between the

active and standby SNCs.

■ The ‘‘SNC-LINK (Switch Node Clock Link)’’ MO covers errors between the

active SNC and SNIs over the serial channel (aux data is 1). Also, the

SNC-LINK MO covers TPN Link errors between the active SNC and SNIs

(aux data is 2).

■ The ‘‘SNC-REF (Switch Node Clock Reference)’’ MO covers errors the

active SNC detects with SNI reference signals.

SNC circuit packs are part of port-network connectivity (PNC). For background

information about PNC, refer to the Maintenance Architecture and Hardware

Configurations chapters.

Figure 8-79. A Center Stage Switch Configuration

Online Switcher (OLS) power supply

carrier

EI

PPN

21

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

EI

EPN

20 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

** = A DS1C circuit pack may reside in this slot

Switch Node Clock (SNC) TN572

Switch Node Interface (SNI) TN573

Expansion Interface (EI) TN570

DS1 Converter (DS1C) TN574

OLS OLS

* = An EI or a DS1C circuit pack may reside in this slot

* * *

S

N

C

S

N

C

S

N

I

S

N

I

S

N

I

S

N

I

S

N

I

S

N

I

S

N

I

S

N

I

S

N

I

S

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S

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S

N

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S

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19 slot number

ﬁber

links

switch

node

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