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100 Chapter 2

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Test Descriptions

TEST_47 - RXD Sensitivity Level Search

Description

This test brackets the actual receiver sensitivity by measuring the

frame error rate (FER) as the mobile station received power is reduced

from that specified by parameter parameter 34. RXD RF Level for

Sensitivity (dBm) to a level that generates an FER greater than that

specified by parameter 35. RXD Sensitivity FER Search Specification

(%). The actual search sensitivity will be at some point between the last

two measured mobile station received power levels.

1. A Service Option 2 (or 9 if parameter 19. RT Rate Set Selection

[0=9600 1=14400] is set to 1) call is attempted, unless a Service

Option 2 or 9 call is already connected. If the MSUT has not

registered, the call attempt may be unsuccessful and the error

message “Failed to establish a call in test <>” will be displayed. To

correct this problem, perform the CPD Registration test.

2. The parameter “RXD RF Level for Sensitivity” is retrieved and that

value is entered in the Sector A Power field.

3. The parameter “RXD Maximum Frames for FER” is retrieved and

that value is entered in the Sector A Max Frames field.

4. The FER test is turned on with a confidence level of 95 percent.

5. The FER Spec field is set to the value specified in parameter 35.

RXD Sensitivity FER Search Specification (%).

6. Traffic Channel level and data rates are set up and the first FER

measurement is triggered. The test software waits for the GPIB

interrupt to determine when the test is complete. The test times out

and continues if the interrupt does not occur within a period

bounded by the value specified in parameter 33. RXD Maximum

Frames for FER. If a timeout occurs, a timeout message displays and

the test continues.

7. Sector A Power is reduced in 0.5-dB steps until the measured FER is

greater than that specified in parameter 35. RXD Sensitivity FER

Search Specification (%) . The test then stops.

8. The following information is printed to the TESTS (IBASIC

Controller) screen for all FER measurements after the first one

greater than 0.0 percent:

• RXD Senstvty FER@ <current mobile received power in dBm>

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 213 214

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Carrier 38TXA Guide Betriebsanweisung Seite 100