User's Manual

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Table Of Contents

BTS Equipment Identification

68P64115A18–1

Mar 2003

1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x

DRAFT

1-20

Internal Assemblies and FRUs

The BTS frame houses the fan modules, Small CDMA Channel

Processor (SCCP) shelf, RF Power Amplifier modules, PA trunking

modules, 2:1 combiners.

RF filtering includes: DRF – Duplexers with TX Filter, RX Filter, and

Diversity RX Filter and TRF – Non-Duplexed TX Filter, RX Filter, and

Diversity RX Filter.

Power system components include an AC Power Input/Filter, DC Filters,

+27 Vdc Power Distribution Assembly (PDA).

Figure 1-2 and Figure 1-3 show the location of the internal assemblies

and Field Replaceable Units (FRU). A brief description of each item is

found in the following paragraphs.

Figure 1-3: I/O Interconnect Plate

FRONT

SITE I/O

LAN

CONNECTIONS

GPS IN

HSO/LFR

RF FILTERING

POWER INPUT/

DC FILTER

ETHERNET ROUTER (IF USED;

OTHERWISE, FILLER PLATE)

EXP FILLER

PLATE

REAR

SPAN I/O

ti-CDMA-WP-00214-v01-ildoc-ftw

ÄÄÄÄÄÄÄÄÄÄ

ALARM

CONNECTORS

POWER INPUT/

AC FILTER

FILLER PLATE

DC Power Distribution Assembly (PDA)

Both rectifier output voltage and back–up battery voltage are routed to

the PDA (Figure 1-3) where they are combined into system DC bus

voltage. The PDA provides distribution of DC power and system DC

bus protection from the loads with MAIN BREAKER and the smaller

post–distribution circuit breakers. MAIN BREAKER permits removal of

all frame loading from the bus. The 13 post–distribution circuit breakers

permit removal of individual loads.