V.25 Bis Network Interface; Table 3-2: Rs-449 Interface Maximum Cable Lengths - PictureTel Concorde 4500 Servicing Manual

NETWORK INTERFACES

V.25 bis Network Interface

3-8
The maximum cable length depends on the data rate being used, as
shown in the following table.
Table 3-2: RS-449 Interface Maximum Cable
Lengths
Data Rate
100,000
200,000
300,000
400,000
Note: This interface, like the V.35, does not include a provision
for dialing. However, there are two associated RS-366A
ports used to pass dialing information from the
videoconference system to the external network device.
See Appendix C, ÒElectronics Module Connections,Ó for
information on the RS-366 A dialing ports available for the EIA
RS-449 network interface.
The ITU-T V.25 bis network interface is a Northern Telecom-
compatible V.25 bis interface that is designed to be used only with
Data Units that support the Northern Telecom V.25 bis subset, such
as Model NT4X25AG.
The V.25 bis network interface uses a DA-15 pin connector on
one end and a 34-pin block connector on the other end (see
Appendix B).
Use a Belden type 8108 cable or equivalent cable.
See Appendix C, ÒElectronics Module Connections,Ó for
information on the V.25 bis network interface panel. For information
on pin assignments, see Appendix B.
Maximum Cable Length
1,216 meters (4,000 feet)
758 meters (2,5000 feet)
455 meters (1,500 feet)
304 meters (1,000 feet)