User Guide

PAMS

Technical Documentation

NME–3

JBD–2 User Guide

Page 9

Issue 1 10/99

RS232

to PC

AIN

AOUT

MIC

SPK

LINE

Switch–Matrix

HSEARP,HSEARN

HSMICP, HSMICN

HSEARP,HSEARN

Figure 4. Routed audio path in HS path

Test Setup

JBD–2

TDC–4

OSCI

Signal

Generator

AIN

AOUT

CH1

CH2

Measure Application

This describes one of several measure possibilities.

In order to test to the complete HSMIC and HSEAR path, the RU must be

set on internal audio–loop. Then inject a HSMIC signal in AIN and

measure the HSEAR signal with oscilloscope at AOUT.

If it is not possible to set the RU on the internal audio–loop, it is possible

to create it on the RF side with an external audio–loop and a GSM tester.

HF path

Tests the HF path from the RU.

The audio signals (HFMICP& SPKP/N) are routed via switch–matrix to

AIN and AOUT.

— The audio signal SPKP/N is a balanced signal. (A

balanced–to–unbalanced converter is used).