User Manual

TX Pilot Time Offset Acceptance Test

SC4812ET BTS Optimization/ATP — CDMA LMF

Jan 2002

4-10

Background: Pilot Offset

Acceptance Test

This test verifies the transmitted Pilot channel element Pilot Time Offset

of each BBX2 carrier keyed up at a specific frequency per the current

CDF file assignment. All tests are performed using the external

calibrated test set controlled by the same command. All measurements

will be via the appropriate TX OUT (BTS/RFDS) connector.

The Pilot Gain is set to 262 for each antenna and all TCH elements from

the MCCs are forward link disabled. The BBX is keyed up using both

bbxlvl and bay level offsets to generate a CDMA carrier (with pilot

channel element only, Walsh code 0). BBX power output is set to

40 dBm as measured at the TX OUT connector (on either the BTS or

RFDS directional coupler).

The calibrated communications test set measures and returns the Pilot

Time Offset in uS, verifying results meet system tolerances: Pilot Time

Offset should be within <

3 µs of the target PT Offset (0 mS).

The BBX2 then de-keys, and the applicable redundant BBX2 is assigned

to the current TX antenna path under test. The test is then repeated.