SNC-BD (Switch Node Clock Circuit Pack)
Issue 1 May 2002
8-1385
555-233-143
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)’’
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
N
I
S
N
I
S
N
I
S
N
I
S
N
I
S
N
I
S
N
I
19
slot number
fiber
links
switch
node
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...