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2.3.2.2 4TRM
The 4 Port Trunk Module (4TRM) board provides four (4) analog trunk ports. A 4TRM
board provides both of the PRS and CID paths.
Key Functions
The 4TRM voice trunk board provides the following functions:
Incoming ring detection
On/Off-hook detection
Dial pulse transmission
PRS function
CID function
Line monitoring function. This function checks whether or not a line is connected, and
provides the service only if it is connected
Specification
The 4TRM voice trunk board provides four (4) trunk ports.
Board View
The 4TRM board can be mounted as a daughter board on the BMP (B8S part) or E8S
board.
There is no separate line connection part within the 4TRM board. It is connected to an
external line through the RJ45 connector on the line connection part, located at the left
side of the system.
Figure 2.8 4TRM Board
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