User's Manual

RGPS Cabling for Multiple BTS Sites Equipped with Optional Primary

Surge Suppressor

– continued

JAN 2002

5-25

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

DRAFT

Surge suppressors

Surge suppressors (Polyphaser 097–1017A–A.1) are required for certain

installations.

Cable Diagrams and

Description

Figure 5-21 shows the RGPS cabling for a multi–BTS configuration for

an RGPS (synchronous) configuration. Figure 5-22 shows the RGPS

cabling for a multi–BTS HSO (non–synchronous) configuration.

Figure 5-17 shows the general construction of the RGPS Sync Cable

(cable X). Cable X is supplied by Motorola with a 7.5 k Ohm, 1W

resistor already installed 150 mm from the end of the cable on the

blue/black wire. There is 200 mm on each end of the cable where the

jacketing has been cut back.

If necessary, the jacketing of cable X may be cut back further for proper

strain relief. For installations that require surge protection, you may cut

cable X at the dashed lines and insert the surge protection devices. Refer

to Table 5-21 for instructions to install the RGPS with surge protection.

Figure 5-17: RGPS Sync Cable Diagram

7.5 K OHM, 1W

RESISTOR

RGPS SYNC CABLE

LOOSE WIRES

CABLE JACKET

200mm

150mm

5M MAX5M MAX

Procedure to Install RGPS

Cabling for an Indoor

Installation

Use the procedure in Table 5-20 to connect the RGPS Sync cable for an

indoor installation. Refer to the cable run list in Table 5-23, Figure 5-21,

and Figure 5-22.

Table 5-20: Procedure to Install RGPS Cabling for an Indoor Installation

Step Action

1 Connect the resistor end of the RGPS Sync Cable (cable X) to the sync reverse lines on the Site

I/O interface of BTS N. Refer to Figure 5-18. Refer to Table 5-23 for the cable X pinouts .

2 Connect the drain wire of cable X to a lug terminal tied directly to the master ground (earth

ground) of BTS N.

3 Route cable X from BTS N to BTS N+1.

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