Lucent Technologies Release 7 The SNC circuit packs are associated with three maintenance objects :, serial communication chan nel between the active and stand by SNCs., Figure 9-82. A Center Stage Switch Configuration

DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4 June 1999
Maintenance Object Repair Procedures
9-1382SNC-BD (Switch Node Clock Circuit Pack)
9
The SNC circuit packs are associated with three maintenance objects :
■The SNC-BD MO covers general SNC board errors and er rors with the
serial communication chan nel between the active and stand by SNCs.
■The SNC-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 MO covers errors the active SNC detects with SNI reference
signals.
SNC circuit packs are par t of port network connectivity (PNC). For back ground
information about PNC, refer to the Maintenance Arch itecture and Hardware
Configurations chapters.
Figure 9-82. 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