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

Multislot power versus time measurement

All specifications for the multislot power versus time measure-

ment are valid between +20 and +55 °C and using high linearity

ranging mode. GSM/GPRS/EGPRS multislot transmit power mea-

surement or EGPRS multislot-tolerant transmit power measure-

ment accuracy specifications apply to output power results.

Types of signals

measured

Normal GMSK and 8PSK bursts, RACH bursts

for a single uplink timeslot only

Multislot input signal

conditions

≤ 30 dB difference in power level between

adjacent timeslots. For warranted performance

at Capture All Mode, the maximum difference

between all slots should be ≤ 20 dB

Multislot signal mea-

surement capability

Measurement of a single GMSK or 8PSK uplink

timeslot or five adjacent GMSK and/or 8PSK

uplink timeslots with capture all mode

Frequency capture

ranges

Signal must be within ± 100 kHz of test set’s

expected frequency for warranted performance

Minimum input level

Signal at test set’s RF IN/OUT must have

transmit power ≥ –15 dBm for warranted

performance

Mask placement timing

accuracy

< ± 0.1 symbols with midamble synchronization

Trigger sources

RF rise, protocol, immediate, auto, external

Trigger delay

Settable between ± 2.31 ms

Burst synchronization

Midamble, RF amplitude, none for a single GSM

or GPRS uplink timeslot; midamble for two

GSM or GPRS uplink timeslots or any EGPRS

uplink timeslots

Tx power method

Estimated carrier power or average burst

power

Ranging mode

High linearity or high dynamic range

Marker measurement

points

12 time points within each burst are definable

PCS ETSI limit

Selection of narrow or relaxed mask in PCS

1900 MHz band

Mask types

Selectable as ETSI, custom 1, custom 2, or no

mask for each burst and ETSI, custom, or no

mask for guard period between bursts

Numerical results

– For entire single or multislot signal: pass/

fail for rising edge, active part(s), falling

edge, and guard period

– For each burst: GMSK transmit power or

8PSK burst power, worst case upper mask

limit margin and time, worst case lower

mask limit margin and time, amplitude at

marker measurement points

Displayed graphical

results

– For single-slot signals: fixed dBc versus μs

views of full, rising edge, falling edge, and

useful part of burst

– For multislot signals: fixed dBc versus μs

views of both bursts, guard period, burst

1, and burst 2

– For all signals: ETSI-defined mask, pass/

fail indicators, settable marker, and

variable time and amplitude axes

Multi-measurement

capabilities

1 to 999 bursts; minimum, maximum, average,

and standard deviation results

Concurrency capabilities Multislot power versus time measurements can

be made concurrently with all other measure-

ments

Supplemental characteristics

Typical relative

measurement accuracy

< ± 0.25 dB over –7 to +1 dB for GMSK bursts

< ± 0.25 dB over –4 to +4 dB for 8PSK bursts

Typical dynamic range

and typical noise floor

For measurement of the second burst in a

multislot configuration with the first burst

> 10 dB higher than the second burst

– Typical dynamic range: > lesser of 74 or

84 dB minus power offset between bursts,

or

– Typical noise floor: < –62 dBm, whichever

dominates

For all other single and multislot signals

– Typical dynamic

range

– > 74 dB, or

– Typical noise floor

– < –62 dBm, whichever dominates

Measurement resolution 0.01 dB

Accuracy (dBm)

Frequency (MHz)

< ± 0.5 dB

–7 to +1 dB for GMSK bursts

< ± 1.0 dB

–7 to +4 dB for 8PSK bursts

< ± 2.0 dB

–20 to < –7 dB

–32 to < –20 dB

< ± 2.7 dB

< ± 3.0 dB

1. For measurements on any burst in a multislot configuration where the

burst is not the highest, the minimum power is the higher of the following

three cases:

– –60 dB below reference

– For capture all mode –60 dB and for capture single mode, –70 dB below

reference plus the offset between this burst power levels and the highest

burst power level

– –46 dBm