Overview
950-818-100-01, Revision 01
4
November 30, 1999
PCS-818 List 1
The following sections identify each connector by type and function.
Power
The COT shelf backplane has a five-position power-terminal strip (TB1) that provides connections for redundant
-48 Vdc, common battery return, and frame ground to each of the card slots by way of screw terminals. The COT
shelf can be wired for redundant powering or single-source powering depending upon requirements.
COLU HDSL
Each COLU slot is equipped with eight wire-wrap pins for xDSL interfaces.
Subscriber Pairs
A total of 128 two-wire subscriber pairs terminate at the Telco connectors P1, P2, P3, and P4, on the COT shelf
backplane. Eight pairs route to each of the sixteen COLUs. At present up to six pairs are supported by existing
COLU’s. The additional two pairs are for future COLU configurations. See Tables 5 through 8 for P1, P2, P3, and
P4 connector pinouts.
Alarm Cutoff
The COT shelf backplane provides a wire-wrap pin for connection to an external alarm cutoff circuit.
Alarm Contacts
The COT shelf provides access to the PAU alarm relays through the wire-wrap pins on the COT shelf backplane.
Both normally open (NO) and normally closed (NC) relay operation is supported. Figure 4 shows the
configuration of the alarm relays.
Table 1.
Backplane Connectors
Connector
Description
J20
DB-9 RS-232 connector
J21
LAN 10base2 connector
J22
LAN 10baseT connector
P1 - P4
64-pin Telco connectors
TB1
Five-position power-terminal strip
FGND
Frame ground lug
Use the frame ground lug located on the upper left corner of the COT shelf backplane, with
2.6 mm wire to ground the COT shelf. This is the preferred frame ground connection point.
