Communications Board; Control Ports A And B; Table 2-4: Control Port Data Rates - PictureTel Concorde 4500 Servicing Manual

Communications
Board

Control Ports A and B

Control Port
Control Port A
Control Port B
The Communications board (CP) is located in slot 4 on the
backplane. The Communications board supports all network
communications and loads and executes the system software that
controls the operation of the electronics module. This board also
controls all power-up and user-selectatable diagnostics.
The CP board performs the following system control functions:
Controls DMA data transfers between the VI board and the
HAP boards.
Coordinates coding (compression) of video, audio, and graphic
data for network transmission and decoding (decompression)
of data for the VI, AI, and graphics boards.
Sends encoded (compressed) video, audio, graphic, and
transparent data for encryption, packetization, queueing, and
transmission.
Receives data and coordinates depacketization and decryption
of data. Once done, the data is sent to its destination.
Controls network interface dialing.
Coordinates control ports A and B for data and control
application.
The control ports A and B on the back of the Communication board
(CP) and Data Interface board (DI) support RS-232C data interfaces
at the data rates listed in the following table.

Table 2-4: Control Port Data Rates

Interface
RS-232C 1.2 - 9.6 async (for controlling the
Concorde¥4500)
RS-232C 1.2 - 9.6 async (for controlling the
Concorde¥4500)
0.3 - 38.4 async (for passing transparent data)

Communications Board

Data Rate (kbps)
2-9