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

1-22

50-pair Punchblock

The 50-pair punchblock (Figure 1-5) 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 (Remote GPS

and HSO), and pilot beacon control (optional).

Figure 1-5: 50-Pair Punchblock

Rear of Frame

(Power Entry Compartment

Door Open)

Section of Network Interface Panel

(Rotated 30 Right)

50-pair

Punchblock

(Cabling not

shown for

clarity)

SC4812ETL0024-2

AC Load Center (ACLC)

The ACLC is the frame entry point for AC power. It incorporates AC

power control, distribution, and surge protection (Figure 1-3). Two

versions are available, depending on the type of AC input power

available at the operating site:

1. International

2. North American

Back-up Batteries

The batteries (Figure 1-3) provide +24 Vdc back-up for the frame should

AC power be interrupted. The frame can accommodate a total of 12 12V

batteries grouped in six strings. Each string consists of two batteries

connected in series for 24 Vdc output. The six strings are connected in

parallel to meet the current-draw requirements of the frame. The

maximum time duration of the back-up capability depends on system

configuration.