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SCP-PCS718-020-04H
P
OWER
The COTS backplane has a seven-position power-terminal strip (TB1) that provides connections for dual -48 V dc,
common battery return, and frame ground to each of the card slots by way of screw terminals. The shelf can be wired
for redundant powering, split-powering, or single-source powering depending upon requirements.
COLU HDSL
There are 12 sets of wire-wrap COLU HDSL interfaces on the backplane, one for each COLU slot (J4 - J15 where J4
corresponds to slot LU1, and J15 corresponds to slot LU12). Each COLU slot is also equipped with a second pair of
HDSL wire-wrap pins for future XDSL configurations.
Two-Wire Subscriber Pairs
The COT has twelve COLUs, each COLU has six pairs of wires totaling in 72 two-wire subscriber pairs that terminate
at the wire-wrap pins on the backplane.
Four-Wire Pairs
The COTS provides a total of twelve four-wire data interfaces (PB1-PB12) that are segregated from the two-wire pairs
on separate punch-down blocks (4W Interface Type 110, see Table 2). One four-wire connection is provided for each
COLU slot.
PCS-718 List 2
Table 2.
PB1-PB12 Punch-down Blocks
Punch Block #
Assignment
PB1 Transmit
4WTXR1
PB1 Receive
4WRXR1
PB2 Transmit
4WTXR2
PB2 Receive
4WRXR2
PB3 Transmit
4WTXR3
PB3 Receive
4WRXR3
PB4 Transmit
4WTXR4
PB4 Receive
4WRXR4
PB5 Transmit
4WTXR5
PB5 Receive
4WRXR5
PB6 Transmit
4WTXR6
PB6 Receive
4WRXR6
PB7 Transmit
4WTXR7
PB7 Receive
4WRXR7
PB8 Transmit
4WTXR8
PB8 Receive
4WRXR8
PB9 Transmit
4WTXR9
PB9 Receive
4WRXR9
PB10 Transmit
4WTXR10
PB10 Receive
4WRXR10
PB11 Transmit
4WTXR11
PB11 Receive
4WRXR11
PB12 Transmit
4WTXR12
PB12 Receive
4WRXR12
January 6, 2003
Assignment
4WTXT1
4WRXT1
4WTXT2
4WRXT2
4WTXT3
4WRXT3
4WTXT4
4WRXT4
4WTXT5
4WRXT5
4WTXT6
4WRXT6
4WTXT7
4WRXT7
4WTXT8
4WRXT8
4WTXT9
4WRXT9
4WTXT10
4WRXT10
4WTXT11
4WRXT11
4WTXT12
4WRXT12
Theory of Operation
5
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