User's Manual

Internal Assembly Identification and Location

68P09255A69-3

Aug 2002

1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x

PRELIMINARY

1-24

Rectifiers

The rectifiers (Figure 1-3) convert AC power supplied to the frame to

+27.4 Vdc which powers the frame and maintains the charge of the

back-up batteries. Rectifier positions are numbered 1 through 4 from left

to right when facing the frame. Single-carrier frames are equipped with

three rectifiers installed in positions 1, 2, and 3. Two-carrier frames are

equipped with four rectifiers. The number of rectifiers supplied with

each configuration provides N+1 redundancy.

RF Diagnostic Subsystem (RFDS)

The RFDS (Figure 1-6) provides capability for remotely monitoring the

status of the SC4812ET Lite transmit and receive paths. For IS-95A/B

operation, the RFDS is a COBRA model. To support 1X operation, the

RFDS must the 1X-capable COBRA-II.

Small CDMA Channel Processor (SCCP) Shelf

The SCCP shelf has provisions for the following types and quantities of

modules (Figure 1-3 and Figure 1-6):

 Alarm Monitoring and Reporting (AMR) cards (2)

 Broad Band Transceiver, second generation or 1X, (BBX2 or

BBX-1X) cards, primary (6)

 BBX2 or BBX-1X card, redundant (1)

 CDMA Clock Distribution (CCD) cards (2)

 Clock Synchronization Manager (CSM) on two cards (one with GPS

receiver, if ordered)

 Combiner Input/Output (CIO) card (1)

 Fan modules (2)

 Filler panel (as required)

 Group Line Interface, second generation, (GLI2) cards (2)

 High Stability Oscillator (HSO)/Low Frequency Receiver (LFR) card

(Optional) (1)

 Multi-coupler Preselector Cards (MPC) (2 per starter frame; 1 per

companion frame)

 Expansion Multi-coupler Preselector Card (EMPC) (1 per companion

frame)

 Multi-Channel CDMA (MCC8E, MCC24E, or MCC-1X) cards (4)

 Power supply cards (2)

 Switch card (1)