User's Manual Part 2

Download the BTS – continued

PRELIMINARY

1X SCt4812ET Lite BTS Optimization/ATP

08/01/2001

3-36

Table 3-17: Enable CSMs

Step Action

* 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 CSM 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).

NOTE

S If equipped with two CSMs, CSM–1 should be bright green (INS–ACT) and CSM–2 should be

dark green(INS–STB)

S If more than an hour has passed, refer to CSM Verification, see Figure 3-13 and Table 3-20 to

determine the cause.

After the CSMs have been successfully enabled, be sure the PWR/ALM LEDs are steady green

(alternating green/red indicates the card is in an alarm state).

Enable MCCs

This procedure configures the MCC and sets the “tx fine adjust”

parameter. The “tx fine adjust” parameter is not a transmit gain setting,

but a timing adjustment that compensates for the processing delay in the

BTS (approximately 3 mS).

Follow the steps outlined in Table 3-18 to enable the MCCs installed in

the SCCP shelves.

The MGLI and CSM must be downloaded and enabled,

prior to downloading and enabling the MCC.

IMPORTANT

Table 3-18: Enable MCCs

Step Action

1 Click on the target MCC(s) or from the Select pull down menu choose All MCCs.

2 From the Device menu, select Enable

A status report is displayed confirming change in the device(s) status.

3 Click OK to close the status report window.