Overview
950-818-100-01, Revision 01
2
November 30, 1999
PCS-818 List 1
O
PERATION
Data Channel Overview
The COT shelf backplane uses redundant Pulse Code Modulation (PCM) transmit and receive buses and Serial
Communications buses (SCB) for data transfer and intra-COT shelf communications. Individual clock, data, and
synchronization buses originate from the PMX card and terminate at each COLU position. The COT shelf
provides the signal connectivity and –48 Vdc power distribution in the COT shelf. Figure 2 shows the backplane
signal interconnection.
Figure 2.
Backplane Signal Configuration
PAU or PMU
COLU #1
COLU #16
RBUS1A
RBUS16A
TBUS16A
TBUS1A
G.703-1
G.703-8
MUX (PMX)
EXT
CLK
1
INTA
INT1
u
u
u
INT16
17
HDSL
8
HDSL
8
RS232
OS
G.703
LAN
10baseT
Subscriber
Pair
121-128
Subscriber
Pair
1-8
16
16
8
2
2
Alarm
Contacts
21
TBUSEOCA
RBUSEOCA
ACO
2
SCB1
SCB16
INTERNAL BUS TO
COLU SLOTS 2 TO 4
INTERNAL BUS TO COLU
SLOTS 13 TO 15
2
LAN
10base2
OS
OS
SCBA
REF CLK
