User's Manual

Internal Assembly Location and Identification – continued

PRELIMINARY

1X SCt4812ET Lite BTS Optimization/ATP

08/01/2001

1-20

Filter/Combiner Shelf (Bandpass Filters or 2:1 Combiners)

The filter/combiner shelf (Figure 1-3) holds the transmit bandpass filters

or 2:1 combiners, depending on system configuration.

Heat Exchanger

The heat exchanger provides cooling to the frame RF compartment. The

fan speed of the heat exchanger adjusts automatically with temperature.

The heat exchanger is located in the frame main door (Figure 1-2).

Punchblock

The punchblock (Figure 1-4) is the interface between the frame and the

T1/E1 span lines. It is located on the right–hand side of the power entry

compartment at the rear of the frame. The punchblock provides the

initial interconnection between the spans and the Customer–defined I/O,

alarms, multi–frame timing source (RGPS and RHSO), and pilot beacon

control (optional).

Figure 1-4: 50–Pair Punchblock

SC4812ETL0024–1

Rear of Frame

(Power Entry Compartment

Door Open)

Section of Network Interface Panel

(Rotated 30_ Right)

50–Pin

Punchblock

(Cabling not

shown for

clarity)