User's Manual

BTS Equipment Identification68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
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BTS Equipment Identification
Equipment Overview
Frame - 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 lower
weight. The BTS is powered by 208/240 Vac (North American frame) or
230 Vac (International frame), rectified internally to +27 Vdc, and can
support up to two carriers in a 3-sector configuration. Six-sector
operation is not supported with any SC4812ET Lite configuration.
Frame Configurations - The SC4812ET Lite is available in starter and
companion frame configurations. Following are brief descriptions of
each:
1. Starter - This frame configuration is available with one- and
two-carrier capability with separate antenna sets for each carrier. It
can operate as a stand-alone BTS, or can be modified in the field to
the companion frame configuration.
2. Companion - This frame configuration is available with one- and
two-carrier capability using 2:1 TX combiners and a single antenna
set for the frame. It operates with another SC4812ET Lite
companion frame which has its own antennas and different carriers.
Companion frames share RX signals to provide diversity RX for the
opposite frame. Companion frames allow equipping a single
SC4812ET Lite site with up to four carriers. Each companion frame
is managed in the Base Station System (BSS) as a separate BTS.
Internal components - The BTS frame houses the fan modules, RF
compartment heat exchanger, Small CDMA Channel Processor (SCCP)
shelf, 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
system 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.
BTS, Frame, Span, and Device Numbering
BTS and frame numbering - An SC4812ET Lite is a single-frame
BTS. Within a BTS, all RF Modem Frames (RFMF) are identified as
parts of a single, numbered BTS (for example, BTS-812) . Each RFMF
is assigned a unique frame number. SC4812ET Lite BTSs consisting of
either a starter or a companion frame have a single RFMF. Because of
this, each frame is numbered as a BTS -1 frame of its own unique BTS
number. As an example, at a site with two frames in a companion
configuration, each frame would have a different BTS number, such as
BTS-812 and BTS-813 . Each frame would be numbered as frame -1 of
its BTS: BTS-812-1 and BTS-813-1 .
Span numbering - Figure 1-1 shows the frame span configuration for a
BTS consisting of an SC4812ET Lite starter or companion frame. The
figure also shows the BTS-to-CBSC Transcoder span configurations
which can be employed with an SC4812ET Lite BTS.
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