There is an ANTCOM (also called an ABC) located in each antenna shell. All communication between the antenna and ONLINE is routed through the ANTCOM in that antenna. The ANTCOM receives various parameters sent by COMH, performs some computations if necessary, and passes on the commands to the appropriate sub system of the antenna. In detail, the ANTCOM has three communication links, viz. (a) the main link between COMH & ANTCOM which operates at 250 kbps, (b) an asynchronous 9.6 kbps RS 422 communication link between ANTCOM & the Servo Control Computer (SCC) and (c) an asynchronous 9.6 kbps RS 485 communication link between ANTCOM & upto 16 Monitor and Control Modules (MCMs).
In addition to the ANTCOMs in the various antennas, there is also an ANTCOM (called ABC0) in the receiver room of the CEB. ABC0 handles the configuring of the baseband system in the receiver room.