User's Manual Part 2

CSM System Time/GPS and LFR/HSO Verification – continued

Mar 2001

3-37

SCt4812T CDMA BTS Optimization/ATP

DRAFT

GPS Initialization/Verification

Follow the procedure in Table 3-19 to initialize and verify proper GPS

receiver operation.

Prerequisites

Ensure the following prerequisites have been met before proceeding:

 The LMF is not logged into the BTS.

 The COM1 port is connected to the MMI port of the primary CSM via

a null modem board (see Figure 3-9).

 The primary CSM and HSO (if equipped) have been warmed up for at

least 15 minutes.

 Connect the GPS antenna to the GPS RF connector

ONLY. Damage to the GPS antenna and/or receiver

can result if the GPS antenna is inadvertently connected

to any other RF connector.

CAUTION

Table 3-19: GPS Initialization/Verification

Step Action

1 To verify that Clock alarms (0000), Dpll is locked and has a reference source, and

GPS self test passed messages are displayed within the report, issue the following MMI

command

bstatus

– Observe the following typical response:

CSM Status INS:ACTIVE Slot A Clock MASTER.

BDC_MAP:000, This CSM’s BDC Map:0000

Clock Alarms (0000):

DPLL is locked and has a reference source.

GPS receiver self test result: passed

Time since reset 0:33:11, time since power on: 0:33:11

HSO information (underlined text above, verified from left to right) is usually the #1 reference source.

If this is not the case, have the OMCR determine the correct BTS timing source has been identified in

the database by entering the

display bts csmgen command and correct as required using the edit

csm csmgen refsrc command.

* IMPORTANT

If any of the above mentioned areas fail, verify:

– If LED is RED, verify that HSO had been powered up for at least 5 minutes. After oscillator

temperature is stable, LED should go GREEN Wait for this to occur before continuing !

– If “timed out” is displayed in the Last Phase column, suspect the HSO output buffer or oscillator

is defective

– Verify the HSO is FULLY SEATED and LOCKED to prevent any possible board warpage

. . . continued on next page