User's Manual Part 3

Global Positioning System (GPS) Receivers – continued

9-12 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU MAY 2004

PRELIMINARY

Table 9-5: Procedure to Remove RGPS Head

Step Action

1 Notify operator that the RGPS Head replacement procedure is starting and that alarms can be

expected.

2 Have the OMC–R operator verify the reference source configuration for the CSA.

* IMPORTANT

Before removing an RGPS Head that has a working RGPS receiver, have the OMC–R operator verify

that the reference source for the CSA is configured for an HSO or MSO.

3 Create slack in the RGPS cable so that 0.70 m (2 ft.) of cable extend out of the RGPS Head end of the

mounting pipe/conduit.

NOTE

To prevent twisting of cables, do not unscrew or screw RGPS Head while holding the pipe/conduit.

4 Loosen the pipe/conduit mounting hardware until the pipe/conduit is free to be unscrewed from the

RGPS Head.

5 Grasp the RGPS Head in one hand and the pipe/conduit in the other.

Unscrew the pipe/conduit from the head and separate.

Grasp the cable just below the head and pull out about 0.5 m (16–inches) of cable out of the

pipe/conduit until the mating cable connectors are exposed.

NOTE

The CSA will automatically switch over to the HSO or MSO approximately 2 seconds after

disconnecting a working RGPS Head. Alarms will be triggered at this time.

Install RGPS Head

Follow the procedure in Table 9-6 to install the RGPS Head.

Table 9-6: Procedure to Install RGPS Head

Step Action

1 Connect the cable connector of the replacement RGPS head to the RGPS cable connector.

2 Feed the cable slack into the RGPS head end of the mounting pipe/conduit.

3 Grasp the RGPS head in one hand and the pipe/conduit in the other.

Being careful not to cross thread the fitting on the RGPS head, screw the pipe/conduit into the head.

Hand tighten only!

4 Tighten the pipe/conduit mounting hardware until the pipe/conduit is securely mounted.

5 Notify the operator that the replacement procedure has been completed.

Have the operator verify that the original alarms have cleared and that no new alarms are reported.