Figure 2-5: Communications Board - PictureTel Concorde 4500 Servicing Manual

UNDERSTANDING THE ELECTRONICS MODULE
F Y I
System control bus
2-10
For the CP board, control port A is used only for controlling
F.Y.I.
the Concorde¥4500 and cannot be used to transport
transparent data.
The following illustration shows a block diagram of the
Communications board.
= Option
Control port A
Control port B

Figure 2-5: Communications Board

The Communications board has one of Þve available network
interface modules, which are contained on a daughter board. The
daughter board attaches to the Communications board. The Þve
network interfaces are:
V.25 bis
V.35
X.21
RS-449
Switched-56
For more information on these network interfaces, see Chapter 3.
Encryption
Decryption
System
control
Transmit
to
channel
Receive
from
network
Network
interface
module