Table B-9: Pin Assignments For Eia Rs-449 Network Data Port Using A Belden 9731 Cable; Table B-10: Pin Assignments For X.21 Network Data Port - PictureTel Concorde 4500 Servicing Manual

X.21 Network
Interface
When the network interface or DCE does not require
handshake or encryption-control signals from the
Concorde¥4500, and
When the cost of long cable runs for a full EIA RS-449
implementation is prohibitive.
When you use a Belden 9731, you cable only the signals listed in the
following table.
Table B-9: Pin Assignments for EIA RS-449 Network Data Port
Using a Belden 9731 Cable
Pin Function
Ground
1
4, 221 SD +, SD -
5, 23 ST +, ST -
6, 24 RD +, RD -
8, 26 RT +, RT -
19 SG
20 RC
This section describes the data port pin assignments for the X.21
network interface.
Table B-10: Pin Assignments for X.21 Network
Data Port
Pin
2 T
3 C
Source
Shield
Concorde¥4500
DCE
DCE
DCE
DCE
DCE
Circuit
Transmit A
Control A
X.21 Network Interface
Description
Protective ground
Send data
Send timing
Receive data
Receive timing
Signal ground
Receive common
Description
B-13