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SNC-BD (Switch Node Clock Circuit Pack)
Issue 1 June 2005 2001
Figure 116: A Center Stage Switch Configuration
Figure 117: SNC Functions
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
Clock Duplication
9 Clock Busses
SNC-BD
SNC-BD
SNC-LINK
(aux data 1)
SNC-REF
SNC-LINK
(aux data 2)
TPN Links
Reference Signals
Serial Channel
.
Loop
Locked
Phase
Circuit
Generation
Clock
Microcontroller
.
.
.
.
Active SNC
Standby SNC
SNI 1e02
SNI 1e20
SNI 1e03
.
Microcontroller
TPN
Oscillator
Stratum 3
Control
16
SNI (TN573)
17