4-1
CHAPTER 4
In-box Communication Units
4.1 Communication Management Unit (CMU)
The CMU (See Figure
4-1) enables the IRRInet-XL to communicate using the FSK
INTRAC and FSK MDLC data protocols. The FSK INTRAC protocol is through CPU
module Port 2 and the FSK MDLC protocol is through CPU module Port 3.
For Port 2 (Intrac) the communication media can be either a radio, or a wire line or both
radio and wire line together.
For Port 3 (MDLC) the communication media is radio only.
The CMU Module is installed on the top of the multi-slot I/O card cage, held in place by
the four corner posts and two side snaps. The CMU does not have a plastic panel or slot
location.
Power
Connector
Port 2
Port 3
Radio
Wire Line
Figure
4-1 CMU Module – General View
Jumper P2
(Master / Slave)
For Master Mode (factory default position):
Pin 1 shorted to pin 2
For Slave Mode:
Pin 2 shorted to pin 3
Jumper P3
(Channel Monitor)
Factory Default Position:
Pin 1 shorted to pin 2
Set Port 2 Site Configuration to High
(Intrac)
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