Table 2-6: Data Interface Port Speeds - PictureTel Concorde 4500 Servicing Manual

Loops data output signals back into the data input circuit
during a remote video-audio loopback test initiated by the
far-end system.
The Data Interface board has two RS-232C serial ports, labeled A
and B. Two additional ports, C and D, are added as a pair selected
from one of the following interface types:
RS-232C (data interface)
RS-449 (network interface)
V.35 (network interface)
Each port can be conÞgured for asynchronous or synchronous
communication. If you choose not to conÞgure a port, you can
disable it. The following table describes the speeds at which the
ports can operate.

Table 2-6: Data Interface Port Speeds

Port
Asynchronous and
synchronous RS-232
Asynchronous RS-449
Synchronous RS-449
Asynchronous V.35
Synchronous V.35
Data Interface Board
Speed
From 0.3 - 38.4 kilobits
per second (kbps)
From 0.3 - 38.4 kbps
From 0.3 - 64.0 kbps
From 0.3 - 38.4 kbps
From 0.3 - 64.0 kbps
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