User's Manual

BTS Redundancy/Alarm Testing

68P09258A31–A

Oct 2003

1X SCt 4812T BTS Optimization/ATP

3-116

CSM, GPS, & LFR/HSO Redundancy/Alarm Tests

Follow the procedure in Table 3-54 to verify the manual redundancy of

the CSM, GPS, and LFR/HSO boards. Verification of alarms reported is

also covered.

NOTE

DO NOT perform the procedure in Table 3-54, unless the site is

configured with a LORAN–C or HSO timebase as a backup for

the GPS.

Table 3-54: CSM, GPS, & LFR/HSO, Redundancy/Alarm Tests

Step Action

n WARNING

Any BBXs enabled will immediately key-up. Before enabling any BBX, always verify that the TX

output assigned to the BBX is terminated into a 50 W non-radiating RF load! Failure to do so could

result in serious personal injury and/or damage to the equipment.

1 Enable the primary, then the redundant BBXs assigned to ANT 1 by selecting the BBX and

Device>BBX/MAWI>Key.

2 Disconnect the GPS antenna cable, located on top of the BTS frame.

This forces the LORAN–C LFR or HSO board timebase to become the CDMA timing source.

3 Observe a CDMA timing reference alarm and source change is reported by the alarm monitor.

4 Allow the LFR/HSO to become the active timing source.

S Verify the BBXs remain keyed and INS.

S Verify no other modules went OOS due to the transfer to LFR/HSO reference.

S Observe the PWR/ALM LEDs on the CSM 1 front panel are steady GREEN.

5 Reconnect the GPS antenna cable.

6 Allow the GPS to become the active timing source.

S Verify the BBXs remain keyed and INS.

S Verify no other modules went OOS due to the transfer back to the GPS reference.

S Observe the PWR/ALM LEDs on CSM 1 are steady GREEN.

7 Disable CSM 1 and enable CSM 2.

S Various CSM source and clock alarms are now reported and the site comes down.

S Alarms clear when the site comes back up.

8 Allow the CSM 2 board to go INS_ACT.

S Verify the BBXs are dekeyed and OOS, and the MCCs are OOS_RAM.

S Verify no other modules went OOS due to the transfer to CSM 2 reference.

S Observe the PWR/ALM LEDs on CSM 2 front panels are steady GREEN.

NOTE

It can take up to 20 minutes for the CSM to re-establish the GPS link and go INS. MCCs go

OOS_RAM.

9 Key BBXs 1 and R and observe a carrier is present.

10 Repeat Steps 2 through 6 to verify CSM source redundancy with CSM 2.

. . . continued on next page