User's Manual

3.2.6 TETRA Channel Unit (CHU)
The TETRA Channel Unit (CHU) is the transceiver module of the DIB-R5 and provides
four radio channels for the voice and data transmission in transmitting and receiving
direction (uplink and downlink) via one carrier signal. A transceiver consists of transmitter,
receiver and transceiver software for the TETRA protocol and generates a modulated RF
signal (carrier) with which signaling data and payload between the base station and the
mobile stations are exchanged. In addition to providing the carrier signal, the CHU pro-
vides monitoring and control functions, with which the fan speed can be controlled
dynamically, for example.
The CHU is a modular subrack for the DIB-R5 advanced and provides one carrier. The
DIB-R5 advanced can be expanded in a flexible way by additional CHUs, up to four
CHUs can be installed in one equipment rack. A CHU can be replaced during ongoing
operation in case of malfunctions to quickly re-establish radio coverage.
The following figure shows the front view of the CHU. The following table describes it in
detail.
Figure 20: CHU (front view)
Product description
Components> TETRA Channel Unit (CHU)
DIB-R5 advanced
42 Operation Manual 90DIBR5advancedOM02 - 1.0