PictureTel Concorde 4500 Servicing Manual page 164

PIN ASSIGNMENTS
B-14
Table B-10: Pin Assignments for X.21 Network
Data Port (Continued)
Pin
4 R
5 I
6 S
7 B
8 G
9 T
10 C
11 R
12 I
13 S
14 B
Circuit
Receive A
Indication A
Signal element timing A
Byte timing A
Common return
Transmit B
Control B
Receive B
Indication B
Signal element timing B
Byte timing B
Description