KMW Communications AICM - Manual (Page 4)

Sheet 4 of 17 Sheet 4 of 17 05-30-2006
CONFIDENTIAL
1. Overview
The AICM 1:1 Interface Program is designed to manage each AICM (Air Interface Control Monitoring) through a
RS-232C interface. AICMs are located at BTS inside and they can control and monitor the status of antennas.
A user can input the Antenna information, AICM IP Address, Gateway, Subnet Mask and NMS Server IP Address
into each AICM through RS-232C communication.
Figure 1-1 shows a communication block diagram.
AICM 1:1
Interface Program
RS- 232C
Antenna
Alpha Beta Gamma
AICM
Bias- T
Bias- T
Bias- T
BTS
Feeder
Cable
Feeder
Cable Control
Cable
α- MOT β- MOT γ- MOT
<Figure 1-1> A block diagram of AICM 1:1 Interface
A basic protocol appears in Figure 1-2. The program sends a command to AICM, then AICM checks a received message
for errors. AICM sends an acknowledge message (ACK) unless the received message has errors. Also, AICM sends a
non-acknowledge message (NACK) if certain errors are encountered. If the program doesn’t receive any return message,
the program resends the command twice. The program closes the session (communication Fail) if no return message is
received after these two tries.
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