User's Manual

Internal Assembly Location and Identification – continued

08/01/2001

1-21

1X SCt4812ET Lite BTS Optimization/ATP

PRELIMINARY

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 1-5) provides the 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 1-5):

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

S Broadband Transceiver (BBX2 or BBX–1X) cards, primary (6)

S BBX2 or BBX–1X card, redundant (1)

S CDMA Clock Distribution (CCD) cards (2)

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

receiver, if ordered)

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

S Fan modules (2)

S Filler panel (as required)

S Group Line Interface (GLI2) cards (2)

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

(Optional) (1)

S Multi–coupler Preselector Cards (MPC3) (2)

S Multi–Channel CDMA (MCC8E, MCC24, or MCC–1X) cards (4)

S Power supply cards (2)

S Switch card (1)