Reference Manual

Description 11 (37)
LRN/X-99:083 Rev F 2001-07-17 © Ericsson. Commercial in confidence
AC/DC connection unit and DC filter
The ACCU/DCCU handles the distribution and connection of the incoming power supply
voltages 120-250 VAC (ACCU) or –48/-60 VDC (DCCU) to the PSU´s.
The DC filter handles the connection of the incoming +24 VDC power supply and battery
backup.
Battery backup is available together with 120-250 VAC supply voltage.
Fan Control Unit (FCU)
The FCU controls the fans in the cabinet. The climate handling in the cabinet maintains the
internal temperature range by controlling the fans. The climate handling is controlled by the
DXU via the FCU with the aid of temperature sensors placed inside the RUs.
Tower Mounted Amplifier (TMA)
A Tower Mounted low noise Amplifier (TMA) is an option that can be used in order to
compensate for losses in the antenna feeder and to improve the overall receiver
performance. All the configurations, CDU-G or CDU-F are available with double duplex
TMA as option. Bias injectors and a TMA control module (TMA-CM) are needed in the
cabinet for TMA support. The BIAS injector is used to provide the TMA with DC power
from the TMA-CM over the RF feeders.
Antenna Sharing Unit (ASU)
The Antenna Sharing Unit (ASU) is a new unit that is available as an option for GSM 800
and GSM 1900. The ASU is intended to support antenna sharing between TDMA 850 and
GSM 800 or between TDMA 1900 and GSM 1900. The RX-path is fed from the Antennas
trough the feeders to the ARP (antenna reference point) of the RBS 2206. The signal is then
filtered and amplified in the CDU. From the RX output of the CDU the signal is fed to the
ASU where a small portion of the signal is fed to the RX input of the Co-Sited RBS.