User's Manual

BTS Equipment Identification

SC 4812T CDMA BTS Optimization/ATP

May 2000

1-12

Frames

The Motorola SC 4812T BTS can consist of the following equipment

frames:

 At least one BTS starter frame

– +27 V BTS (see Figure 1-2)

– –48V BTS (see Figure 1-3)

 Ancillary equipment frame (or wall mounted equipment)

 Expansion frames

– +27 V BTS (see Figure 1-4)

– –48V BTS (see Figure 1-5)

Ancillary Equipment Frame

Identification

Equipment listed below can be wall mounted or mounted

in a standard 19 inch frame. The description assumes that

all equipment is mounted in a frame for clarity.

NOTE

If equipped with the RF Diagnostic Subsystem (RFDS) option, the

RFDS and directional couplers are the interface between the site

antennas and the BTS or Modem frame. The RFDS equipment includes:

 Directional couplers

 Site receive bandpass/bandreject filters

 RFDS

BTS Frame Description

The BTS is the interface between the span lines to/from the Cellsite Base

Station Controller (CBSC) and the site antennas. This frame is described

in three sections:

 The top interconnect plate where all connections are made.

 The upper portion of the frame which houses circuit breakers, cooling

fans, and the Combined CDMA Channel Processor (C–CCP) shelf.

 The lower portion of the frame which houses the LPA fans, LPAs, and

TX filter/combiners.

 The –48 V version of the BTS also has a section below the LPAs

containing a power conversion shelf that supplies power to the LPAs.

Use the illustrations that follow to visually identify the major

components, that make up the Motorola SC 4812T BTS frame.

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