User's Manual

Site I/O, Span Line, RGPS, and Modem Cabling for Sites Equipped With

Primary Surge Suppressor

– continued

DRAFT

SC300 1X BTS Hardware Installation, ATP, and FRU Procedures

JAN 2002

5-22

Table 5-14: Pin/Signal Information for Site I/O Cable and Punchdown Block

BTS Interface DescriptionPunchblock

Location

OSP 25T MODEM TIP

Phone (Modem)

OSP 25R MODEM RING

*Motorola recommends that you use the Customer Input 8 Signal and Ground for load center alarms.

Connecting Customer–Defined

Inputs to the Primary Surge

Suppressor

The unit provides eight customer–defined inputs for connection to

external contacts. Each input (a signal/ground pair) is monitored for an

“OPEN” (>50 k Ohms) or “CLOSED” (<3 Ohms) condition.

Motorola recommends using Customer Input 8 Signal and Ground for

AC load center alarms. The Primary Surge Suppressor is shipped with

the AC load center alarms already connected to positions 1 and 2

(OSP8T and OSP8R). Refer to Figure 5-8 and Table 5-15.

Table 5-15: Customer Alarm Wiring Positions in AC Load Center on MOVs

Alarm Wire Positions Circuit Alarm Reason for Alarm

1 2 Normally open Normally closed Damaged MOVs.

Power interruption to surge box

2 3 Normally closed Normally open Damaged MOVs.

Power interruption to surge box

Alarm interruption