Installation manual

COMSPHERE 3000 Series Carrier
B-10 March 2001 3000-A2-GA31-F0
Diagnostic Channel
Extension Cable
To connect two T1 auxiliary backplanes, a 12-inch
cable with 8-pin modular plugs at each end is used (see
Figures B-11 and B-12).
1
2
3
4
5
6
7
8
8-Pin Modular
Plug
496-14403-01
1
2
3
4
5
6
7
8
Figure B-11. Diagnostic Channel Extension
Cable Connectors
8-Pin
Modular Plug
12" Telephone
Cord
496-14404-01
8-Pin
Modular Plug
12
3
4
5
6
7
8
Pin
Numbers
Figure B-12. Diagnostic Channel
Extension Cable
External Clock Connector
The External Clock connector cable (T1 DSU/CSU
only) diagram is shown in Figure B-13. This is a
customer-supplied cable. Connector pinouts are in
Table B-8.
8
1
2
6
7
4
Shield
Shield
Clock In ()
Clock In (+)
Signal Ground
(RS422 Only)
496-14402-01
Figure B-13. External Clock Connector
Table B-8
External Clock Connector
Signal
Pin #
Shield 1, 8
Clock (+) RS422 only 6
Clock () RS422 only 2
Signal Common 7