User's Manual
Introduction
– continued
SC
TM
4812ET RF and Power Cabinet Hardware Installation Manual
DRAFT
Apr 2001
V02.03
14
Product Description
The SC 4812ET BTS consists of an RF Cabinet that is an outdoor,
weatherized version of the SC 4812T. The RF cabinet is powered by 27
VDC and each cabinet has the capability to support up to 4 carriers (at 3
sector) or 2 carriers (at 6 sector). An optional outdoor, weatherized
Power Cabinet that provides AC/DC rectified power and battery back–up
is also available. An air to air heat exchanger is used for conditioning
each cabinet, except in the LPA area of the RF cabinet which uses
blower fans to draw outside air over the LPAs.
The SC 4812T utilizes a new RF “Trunking” technique that provides
shared power between sectors and increased RF output capability. The
SC 4812ET will support additional expansion cabinets to add more
carriers. Duplexer/Directional couplers will be standard equipment for
the SC 4812ET BTS.
The RF Cabinet houses the fan modules, Combined CDMA Channel
Processor shelf (C–CCP), Linear Power Amplifiers (LPA) modules, LPA
trunking backplane, Bandpass 2:1 & 4:1 Combiners, Duplexer/Receive
Filter/Directional Couplers (DRDC) and a DC Power distribution
assembly. The Power Cabinet (PC) provides +27 V DC distribution and
battery backup for the SC 4812ET. The Power Cabinet houses batteries,
battery heaters, rectifiers, an AC Load Center (ACLC), a power
distribution assembly, and two duplexed GFCI convenience outlets.
Scope of This
Document
This document provides information pertaining to the installation of the
Motorola SC4812ET CDMA Base Transceiver Subsystem (BTS) and
optional equipment. The basic frame installation is described in the RF
and Power Cabinet mounting chapter. Expansion cabinet information
will be included in future manual revisions.
For detailed installation information of non–Motorola equipment, refer
to the vender manuals provided with such equipment.
Manual Overview
Chapter 1 – “Introduction” – This chapter describes manual contents,
recommended documents, supplied and recommended tools and
hardware, and equipment identification.
Chapter 2 – “Site preparation” – This chapter details preparing the site
(concrete pad, rooftop, etc.) for RF and Power Cabinet installation,
location considerations, pad and roof mounting instructions, and ground
system information.
Chapter 3 – “How to Unpack the SC 4812ET BTS” – This chapter
contains information on how to unpack the RF and Power Cabinet and
how to inspect for damage.
1