User Manual

Cabinet descriptionNortel Networks Confidential 1–37
S8000/S8002/S8006 BTS Reference Manual
The RF Combiner modules perform the following functions:
transmission coupling of the channels
filtering and duplexing of transmission and reception signals on the same
antenna port
amplification of reception signals
monitoring of the antenna VSWR (option)
The Tx–Filter performs the following functions:
filtering of transmission signals
monitoring of the antenna VSWR (option)
dc compartment
This compartment contains four switches to disconnect the power supply to the
Power Amplifiers, the fans, the ALCO or RECAL board and the BCF or the CBCF.
The compartment also contains an F–type converter, which supplies ± 15 V dc to
the LNA–splitter and the VSWR–meter. A second F–type converter is available as
an option.
PA interconnection compartment
This compartment centralizes the –48 V dc power supply of the Power Amplifiers
(PA).
Power Amplifier and alarm compartment
This compartment contains:
one to eight power amplifiers (PAs)
one ALCO or RECAL board
It is possible to connect the ALCO or RECAL board to one or two external alarm
protection boards (ALPRO) located on top of the base cabinet.
DRX (or e–DRX) interconnection compartment
This compartment centralizes DRX (or e–DRX) outputs. It connects them to the
Power Amplifiers (PA) on the one hand , and interconnects them by means of the
FH bus, on the other.
DRX (or e–DRX) and CBCF Compartment
This compartment contains a maximum of eight modules.
The CBCF module is located in the far right of this compartment. A filling plate
replaces the CBCF when the BCF is used.
RX–splitter compartment
This compartment contains up to six RX–splitters, which receive data signals from
the units in the coupler compartment and distributes them to the DRXs (or
e–DRXs).