X.21 Network Interface; Figure 2-5: X.21 Interface Connector On The Electronics Module - PictureTel Concorde 4500 Administrator's Manual

X.21 Network Interface

The ITU-T X.21 interface:
Provides serial automatic dialing
Operates at bit rates that range from 56 kbps through 768 kbps
for dialed and nondialed networks
Controls network dialing
You need an X.21 network connection to receive the X.21 call
F.Y.I.
F Y I
progress messages. For more information, see Appendix D,
ÒX.21 Call Progress Messages.Ó
The Concorde¥4500 conÞgured with an X.21 interface supports
ISDN terminal adapters, inverse multiplexers, and other network
terminating equipment.
The maximum separation between the Concorde¥4500 and the
network for dialed networks at 64 kbps is 4,000 feet (1,200 meters)
and for nondialed networks at 384 kbps is 820 feet (250 meters).
You must follow these guidelines when providing the cable:
Use a Belden 9732 (or equivalent) cable
Provide a DA-15 female connector to mate with the male DA-15
connector on the back of the electronics module, as shown in
Figure 2-5
Figure 2-5: X.21 Interface Connector on the
Attaching Digital Network Cables
1 2 3 4 5 6
9 10 11 12 13 14 15
Electronics Module
7 8
2-9