User's Manual Part 1

BTS Equipment Identification – continued

Mar 2001

1-19

SCt4812T CDMA BTS Optimization/ATP

DRAFT

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 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.

Top Interconnect Plate (see Figure 1-6 or Figure 1-7)

All cabling to and from the BTS equipment frames is via the

interconnect panel on the top of each frame. Connections made here

include:

 Span lines

 RX antennas

 TX antenna

 Alarm connections

 Power input

 LAN connections

 GPS input or Remote Global Positioning System (RGPS) on the Site

I/O Board

 Remote Global Positioing System Distribution (RGD)

 LORAN–C Low Frequency Receiver (LFR) input

 Expansion frame connection

 Ground connections

C–CCP Shelf (see Figure 1-10)

 C–CCP backplane and cage

 Power supply modules

 CDMA clock distribution (CCD) boards

 CSM and HSO/LFR boards

 Alarm Monitoring and Reporting (AMR) boards

 GLI2 cards

 MPC boards (starter frame only)

 EMPC boards (expansion frames)

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