User`s guide

86 Chapter 2

S:\agilent\83217\OPT001\BOOK\CHAPTERS\tdscrip.fm

Test Descriptions

TEST_39 - RXD Sensitivity & Dynamic Range

Description

This test measures the receiver’s sensitivity by verifying that the frame

error rate (FER) does not exceed 0.5% with 95% confidence level at a

mobile station received power of -104 dBm.

This test measures the receiver’s dynamic range by verifying that the

frame error rate (FER) does not exceed 0.5% with 95% confidence level

at a mobile station received power of -25 dBm.

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 RXD RF Level for Sensitivity parameter is retrieved and that

value is entered in the Sector A Power field. (This is performed in

two steps to prevent the call from being dropped).

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

value is entered in the Max Frames field.

4. The FER test is turned on with a confidence limit of 95%.

5. The FER Spec field is set to 0.5%.

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

measurement is triggered. The software waits for an GPIB interrupt

to determine when the test is done. The test times out and continues

if the interrupt does not occur within a period bounded by the RXD

Maximum Frames for FER parameter. If a timeout occurs, a timeout

message is displayed and the test continues.

7. Sector A Power is set to -25 dBm/BW and another FER

measurement is triggered.

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

Controller) screen. (For each test, FER%, number of frames counted

and number of errors counted is displayed):

• RXD Sensitivity FER@ <RXD RF Level for Sensitivity><FER %>

• RXD Dynamic Rng FER@ -25 dBm<FER %>

Refer to the Agilent 8924C Reference Guide for information about the

FER measurement field and the Max Frames and Confidence setting

fields.