User's Manual

BTS Equipment Identification
08/01/2001
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1X SCt4812ET Lite BTS Optimization/ATP
PRELIMINARY
Equipment Overview
The SC4812ET Lite BTS frame consists of a single, outdoor,
weatherized cabinet containing RF and power components. The BTS is
functionally similar to the two–cabinet SC4812ET, but provides more
flexibility in site selection because of its smaller footprint and lighter
weight. The BTS is powered by 240 Vac, rectified internally to +27 Vdc,
and can support up to two carriers in a 3–sector configuration. An
SC4812ET Lite starter frame with the maximum of one SC4812ET Lite
expansion frame can support a maximum of four carriers in a 3–sector
configuration. Six–sector operation is not supported with any SC4812ET
Lite configuration.
The BTS frame houses the fan modules, RF compartment heat
exchanger, Small CDMA Channel Processor shelf (SCCP), RF Linear
Power Amplifier (LPA) modules, LPA trunking modules, bandpass
filters or 2:1 combiners, and Duplexer Directional Couplers (DRDC) or
Triplexer Directional Couplers (TRDC). Power components include an
AC Load Center (ACLC), rectifiers, a +27 Vdc Power Distribution
Assembly (PDA), backup batteries, battery heaters, and one duplex
GFCI 115 Vac utility outlet.
Logical BTS Numbering
An SC4812ET Lite logical BTS can consist of up to two SC4812ET Lite
frames. In a logical BTS, all frames located at a site are identified as
parts of a single, numbered BTS (for example, BTS–812). Each frame is
assigned a unique frame number. The first, or starter, frame of a logical
BTS has a –1 suffix (for example, BTS–812–1) and the second, or
expansion, frame of the logical BTS is numbered with the suffix, –101
(e. g. BTS–812–101).
Figure 1-1 shows the frame configuration for a logical BTS consisting of
two SC4812ET Lite frames. The figure also shows the BTS–to–CBSC
Transcoder and inter–frame span configurations which can be employed
with an SC4812ET Lite logical BTS.
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