Avaya S8700 Maintenance Manual page 2107

SNC-BD (Switch Node Clock Circuit Pack)
The SNC circuit packs are associated with three MOs:
The ''SNC-BD (Switch Node Clock Circuit Pack)''
board errors and errors with the serial communication channel between the
active and standby SNCs.
The ''SNC-LINK (Switch Node Clock Link)''
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)''
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.
switch
node
OLS
carrier
slot number
Figure 8-79. A Center Stage Switch Configuration
555-233-143
EPN EPN EPN
EI EI EI
PPN EPN EPN EPN
EI EI EI EI
S S S S S S S
* N N N N N N N N
I I I I I I I
1 2 3 4 5 6 7 8
* = An EI or a DS1C circuit pack may reside in this slot
** = 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
Online Switcher (OLS) power supply
MO covers general SNC
MO covers errors between the
MO covers errors the
EPN EPN EPN EPN
EI EI EI EI
EPN EPN
EI EI
S S S S S S S S
N N N N N N N
I C C I I I I
9 10 11 12 13 14 15 16 17
Issue 1 May 2002
EPN
EI
EPN EPN
EI EI
fiber
links
S S S
OLS
N N N * *
I I I I
18 19 20 21
8-1385