User's Manual

Open Information
DESCRIPTION 8 ( 20 )
EAB/RWB/ZG Christina Wilson 18/1551–HRB 105 102/1 Uen
EAB/RWB/Z (Dennis Radenholt) 2003-06-16 B
Prepared (also subject responsible if other) No
Approved Checked Date Rev Reference
E
With an optional RAXB it is possible to share the load to achieve high
availability. If one RAXBs fails, the load is moved to the remaining RAXB.
GPB
The General Processor Board (GPB) operates as an MP and contains and
executes the main part of the RBS software. It controls devices on boards and
in auxiliary units. The GPB has flash disk storage, an Ethernet connection and
an RS232 interface.
TXB
The Transmitter Board (TXB) comprises the baseband transmitter part for
handling transport channels, encoding, cell splitting, modulating and spreading,
and channel combining.
TUB
The Timing Unit Board (TUB) generates and distributes local timing signals.
BBIFB
The Baseband Interface Board (BBIFB) connects the baseband part of the
BB/RF subrack to the RF part of the BB/RF subrack. The connection carries
the downlink and uplink traffic streams, and timing signals.
4.1.2 Radio Frequency Boards
AIU
The Antenna Interface Unit (AIU) consists of a filter and control unit, and a
combiner and splitter unit. The filter and control unit provides the following:
• Duplex filtering of the transmitter and receiver signal
• Low-noise amplification of the receiver signal
• Power measurement of the transmitter signal
• Flexible frequency and signal splitting
RFIFB
The Radio Frequency Interface Board (RFIFB) connects the RF part of the
BB/RF subrack to the baseband part of the BB/RF subrack. The connection
carries the downlink and uplink traffic, and timing signals. The RFIFB also
performs power clipping for downlink traffic.
TRXB
The Transceiver Board (TRXB) provides channel filtering, delay and gain
adjustment, A/D and D/A conversion, and RF modulating and demodulating.
A TRXB comprises two independent transceivers for two transmitter and
receiver signal pairs.