Motorola BTS Incell

 Motorola BTS Incell

Dimensions
The cabinet has the following dimensions:
Height 2100 mm excluding lifting eyelets
Width 711 mm excluding isolation strips
Depth 416 mm excluding isolation strips

The upper portion of the cabinet houses RF hardware:

•  Transceiver shelf.
• The transceiver shelf assembly consists of a tray that can mount transceivers. The number of transceivers that can be fitted to a cabinet depends on the cabinet type and the type of transceiver, generally the number of the cabinet denotes the maximum number of transceivers that can be fitted. For example a BTS6 cabinet can accommodate six transceivers.

•  Transmitter combiners and bandpass filters.
• The transmit combiner shelf is directly above the upper bank of fans. The shelf holds transmit combiners and bandpass filters. Transmit combiners are discrete hybrid combiners. Transmit RF signals to be combined inside a BTS cabinet can either come from transceivers within the cabinet or from an external source, usually a second BTS cabinet.

•  Receiver front end (RFE).

The receiver front end (RFE) shelf is directly above the transmit combiner shelf. The
RFE shelf contains:
Receiver preselector and eight-way splitter modules.
Dual path preselectors (DPPs).

There must be one preselector module for each antenna input.
A shelf can contain up to three DPPs. A DPP module consists of a bandpass filter, a
preamplifier, and two eight-way splitters. This module allows two antennas to feed up to five transceivers.

PDU
The cabinet power distribution unit (PDU) is in the top shelf.
The PDU contains circuit breakers and fuses and distributes power in the cabinet.

Fan cooling system
The lower bank of fans draws air downward from the upper intake, through the RFE shelf and the transmit combiner shelf, then through a channel behind the transceiver shelf, and down through the BSU shelf.
Blanking panels are installed in the front of empty slots to maintain the correct airflow. The upper bank of fans draws air from below the transceiver shelf through openings in the tray, the transceiver and the deflectors. Blanking plates are installed to close the openings in the tray when the transceiver slot is empty, to prevent air from flowing through empty slots.


Power
requirements

Positive earth BTS cabinets operate from a –48 V or –60 V dc supply. The maximum
power requirements are

GSM900

BTS4 (–48 V) = 45 A.
BTS4 (–60 V) = 35 A.
BTS6 (–48 V) = 60 A.
BTS6 (–60 V) = 50 A.

DCS1800

BTS6 (–48 V) = 55 A.
BTS6 (–60 V) = 45 A.

Negative earth BTS cabinets operate from a nominal +27 V dc (+3 V, –5 V dc) supply.
The maximum power requirements are

GSM900
BTS5 (+27 V) = 85 A.
BTS6 (+27 V) = 95 A.

DCS1800
BTS6 (+27 V) = 85 A.
DRAM Backup 4A at +27 V dc.

 Frequency band characteristics

GSM900
Transmit frequency band (MHz) 935 to 960
Receive frequency band (MHz) 890 to 915
Transmit/receive duplex separation (MHz) 45

Channel width (kHz) 200
Number of channels 124

Transmit frequency guard bands (MHz) 
935.0 to 935.1                    
959.9 to 960.0

Receive frequency guard bands (MHz)
890.0 to 890.1
914.9 to 915.0
Transmit channel centre frequency (MHz)
Even 10ths of a MHz from 935.2 to 959.8

Receive channel centre frequency (MHz)
Even 10ths of a MHz from 890.2 to 914.8

DCS1800 radio channels (RF carriers) are full duplex (transmit and receive)
Transmit frequency band (MHz) 1805 to 1880
Receive frequency band (MHz) 1710 to 1785
Transmit/receive duplex separation (MHz) 95
Channel width (kHz) 200
Number of channels 374
Transmit frequency guard bands (MHz) 1805 to 1805.1 and 1879.9 to 1880.0
Receive frequency guard bands (MHz) 1710.0 to 1710.1 and 1784.9 to 1785.0

Transceiver transmit output power