AT&T IPC-1600 User Manual page 120

IPC-1600 80-Pin Headers P3 and P4
P3 OR P4 80-PIN HEADER
PIN 40
PIN 1
PIN 80
PIN 41
IPC-1600 CIRCUIT BOARD
LEAD 1
IDENTIFIER
16-PORTS FANOUT CABLE ASSEMBLY
CABLE P4 CONNECTS TO P4 (PORTS 1 -- 8)
CABLE P3 CONNECTS TO P3 (PORTS 9 -- 16)
Figure B-2: 80-Pin Headers P3 and P4 Connector Pin Identification
B-4 IPC-1600 USER'S GUIDE