User's Manual Part 2

Download the BTS – continued

MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 6-41

PRELIMINARY

Prerequisites

S GLI is INS_ACT (bright green)

S CSA is OOS_RAM (yellow) or INS_ACT (bright green)

Follow the procedure in Table 6-16 to select a CSA Clock Source.

Table 6-16: Select CSA Clock Source

n Step Action

1 Select the CSA for which the clock source is to be selected.

2 Click on Device in the BTS menu bar, and select CSA > Select Clock Source... in the pull–down

menu list.

– A CSA clock reference source selection window will appear.

3 Select the applicable clock source in the Clock Reference Source pick lists. Uncheck the related

check boxes for Clock Reference Sources 2 and 3 if you do not want the displayed pick list item to

be used.

4 Click on the OK button.

– A status report is displayed showing the results of the operation.

5 Click on the OK button to close the status report window.

For Local GPS (RF–GPS), verify the CSA configured with

the GPS receiver “daughter board” is installed in the BTS’s

CSA slot before continuing.

NOTE

Enable CSA

Follow the steps outlined in Table 6-17 to enable the CSA.

Table 6-17: Enable CSA

n Step Action

1 Click on Device in the BTS menu bar, and select Enable in the pull–down menu list.

– A status report is displayed showing the results of the enable operation.

– Click OK to close the status report window.

* IMPORTANT

– The GPS satellite system satellites are not in a geosynchronous orbit and are maintained and

operated by the United States Department of Defense (DOD). The DOD periodically alters

satellite orbits; therefore, satellite trajectories are subject to change. A GPS receiver that is INS

contains an “almanac” that is updated periodically to take these changes into account.

– If a GPS receiver has not been updated for a number of weeks, it may take up to an hour for the

GPS receiver “almanac” to be updated.

– Once updated, the GPS receiver must track at least four satellites and obtain (hold) a 3–D position

fix for a minimum of 45 seconds before the CSA will come in service. (In some cases, the GPS

receiver needs to track only one satellite, depending on accuracy mode set during the data load).

. . . continued on next page