21 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview

GSM multi-tone audio

Downlink audio measurement mode

Test set generates a multi-tone audio signal and encodes it into speech

frames sent on the downlink traffic channel; the MS decodes the received

speech frames and provides and audio output via a speaker connected to

the test set’s AUDIO IN port.

Applicable specifications GSM analog audio measurement

specifications apply to measured results

Analyzer downlink

reference level

Settable between 100 mV and 5 V

Multi-tone audio

generator downlink

levels

Total level settable between 0 and 70 percent

of 0 dB reference or 1 to 20 levels are settable

between 0 and 70 percent of 0 dB reference,

where the total level of all tones must be < 70

percent of 0 dB reference

Expected AUDIO IN peak

voltage

Settable between 1 mV and 20 V peak

Uplink audio measurement mode

Test set generates a multi-tone audio signal out of the AUDIO OUT port

connected to the MS’s microphone; the MS encodes the tones into speech

frames on the uplink traffic channel and the test set decodes the received

speech frames.

Applicable specifications Audio generator specifications apply to multi-

tone audio signal at the AUDIO OUT port, GSM

decoded audio level measurement

specifications apply to measured results

Analyzer uplink

reference level

Settable between 1 and 100 percent of 0 dB

reference

Multi-tone audio

generator uplink levels

Total level settable between 0 and 4.5 V rms, or

1 to 20 levels are settable between 0 and 4.5 V

rms, where the total level of all tones must be

< 4.5 V rms

Both measurement modes

Analyzer 0 dB reference

mode

Absolute or relative

Analyzer reference tone Settable between 1 and 20 Hz

Device settling time

Settable between 20 ms and 1 s

SINAD/distortion (on

audio tone 1) state

On or off

Multi-tone audio

generator frequencies

1 to 20 frequencies are settable between 10 Hz

and 4 kHz or off, 7 preset states are selectable

as multi-tone 140, multi-tone 100, single tone

300 Hz, single tone 1 kHz, single tone 3 kHz, all

tones off, and none

Multi-tone audio

analyzer frequencies

Use multi-tone audio generator frequencies or

1 to 20 frequencies are settable between 10 Hz

and 4 kHz

Multi-tone audio level

limits

Upper and lower limits are settable between

± 100 dB for 1 to 20 audio tones

Numerical results

Audio level, frequency, SINAD, distortion, total

generator audio level, total measurement audio

level, measurement mode, 0 dB reference

Graphical results

Level and frequency of each audio tone with

limits, settable marker and axes

Timebase specifications

Internal high-stability 10 MHz oven-controlled

crystal oscillator (OCXO)

Aging rates

< ± 0.1 ppm per year, < ± 0.005 ppm peak-

to-peak per day during any 24-hour period

starting 24 hours or more after a cold start

Temperature stability

< ± 0.01 ppm frequency variation from +25 °C

over the temperature range 0 to +55 °C

Warm-up times

5 minutes to be within ± 0.1 ppm of frequency

at one hour, 15 minutes to be within ± 0.01 ppm

of frequency at one hour

Supplemental characteristics

Typical accuracy after

a 30-minute warm-up

period of continuous

operation is derived from

± [(time since last calibration) x (aging rate)

+ (temperature stability) + (accuracy of

calibration)]

Typical initial adjustment ± 0.03 ppm

External reference input

Input frequency

10 MHz

Supplemental characteristics

Input frequency range

< ± 5 ppm of nominal reference frequency

Input level range

0 to +13 dBm

Input impedance

50 Ω nominal

External reference output

Output frequency

Same as timebase (internal 10 MHz OCXO or

external reference input)

Supplemental characteristics

Typical output level

≥ 0.5 V rms

Output impedance

50 Ω nominal

Remote programming

GPIB

IEEE standard 488.2

Remote front panel

lockout

Allows remote user to disable the front panel

display to improve GPIB measurement speed

Functions implemented

T6, TE0, L4, LE0, SH1, AH1, RL1, SR1, PP0,

DC1, DT0, C0, E2

Test Subscriber Identification Module

(SIM) Cards

Test SIM cards are available for purchase from Keysight

Technologies, Inc. Two types are available as follows

– Programmed GSM SIM card micro-size:

Fits most current wireless devices (about 15 x 25 mm), part

number 08922-61887

– Programmed UMTS SIM card micro-size:

Fits most current wireless devices (about 15 x 25 mm), part

number E5515-61286

Ordering Information

For current ordering information, please refer to the configuration

guide, literature number 5968-7873E, on the Web at

www.keysight.com/find/8960

For more information on ordering test SIM cards, visit the

Keysight site at

www.parts.keysight.com