Service Manual

GSM-204-323
Compact transceiver unit (CTU)
31st Oct 01
Tech. 5–16
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
CTU digital
processing and
control
functions
The CTU digital processing and control function provides control and RF
processing for that CTU. These functions include:
 2.048 Mbit/s links which interface with up to two MCUFs for redundancy.
 A software processing platform for the Radio Sub System (RSS)
 Digital Signal Processors (DSPs) for radio control and channel
equalization (EQCP).
 DSPs for channel coding, data routeing, and baseband hopping (CCCP).
 Control of RF systems: diversity receiver, transmitter, and power amplifier.
 Alarm monitoring of internal devices and external cabinet elements.
 Control of external modules, including CCBs (not used in the
Horizon
macro outdoor) and the SURF.
 Maintenance ports for processor TTY, test point sub system, and CTU
test connections.
Figure 5-9 shows a CTU digital functional diagram.
Figure 5-9 CTU digital functional diagram