Embraer EMB145 Operation Manual page 2255

INTEGRATED COMMUNICATION UNIT (RCZ-851E)
The Integrated Communication Unit incorporates an internal VHF
communication transceiver module and the ATC transponder module
which interfaces through a cluster module to the Radio System Bus for
operation.
This unit provides digitized audio signals to the Digital Audio Panel and
conventional analog audio interfaces to other systems. The following
modules may be provided in this unit:
− VHF Communication Transceiver Module (TR-850) - This module is
a conventional VHF COM transceiver that operates in the frequency
range of 118 to 136.975 MHz.
− Mode S Diversity Transponder Module (XS-852) - This transponder
module provides
communications capability. The Mode S Transponder module has
the encoding and decoding capability required for Mode S operation
in addition to the capability to operate as a conventional Air Traffic
Control Radio Beacon Service (ATCRBS) transponder. The Mode S
operation allows digital addressing of an individual airplane and the
transmission of messages back and forth between the air and the
ground.
REVISION 29
AIRPLANE
OPERATIONS
MANUAL
full ATCRBS,
NAVIGATION AND
COMMUNICATION
Mode S and
2-18-07
TCAS data
Page Code
1 01