Avaya Canada Corporation NT800FRM Benutzerhandbuch

60   Subsystem description

411-2133-110   Prototype   01.04   November 1998

–

Transmit receive module (Transceiver board)

–

Microprocessor Board (mP)

The internal layout of the TRM is shown in Figure 41.

The duplexer component of the module provides two functions:

— The duplexer provides isolation between the transmit and receive 

frequency bands thus facilitating the use of one antenna per diversity 
branch per sector.

— The duplexer provides filtering of the transmit and receive 

frequencies thus reducing interfering signals.

The LNA component of the module provides a low noise amplification at the 
system front end thus reducing the overall effects of noise.