Agilent Technologies Cell Phone S GSM Manuel d'utilisateur télécharger pdf (Page 149)

100

101

4-43

Screens

Cell Control 2

25. RACHs This ﬁeld indicates the number of RACHs received during the current call or since

the last Reset.

26. Relative MS

Timing Err

This ﬁeld displays the length of time between when the Agilent 8922M/S expected

the uplink burst to arrive and the time it actually arrived.

Timing error measurements on the uplink burst are made from the center of bit 0,

and are relative to the default trigger delay value of 473.4 T (see Measurement Sync,

Trigger Delay).

The Agilent 8922M/S normally expects the uplink burst 468.75 bit periods after the

beginning of the downlink burst. The trigger delay’s default value of 473.4 T reﬂects

an additional Agilent 8922M/S delay of 4.65 T (468.75 + 4.65 = 473.4 T).

The accuracy of this measurement is ±0.25 T. For more accurate measurements,

refer to DSP Analyzer, Data Bits, First Bit.

See Also Screens: Phase/Freq: Data Bits (First Bit)

27. Reset (Call

Counts)

This ﬁeld clears out the counts of pages, RACHs, synchronization, and decode

errors detected.

28. Reset (SACCH

Meas)

This ﬁeld clears-out all of the SACCH measurements.

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 380 381

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Agilent Technologies Cell Phone S GSM Manuel d'utilisateur Page 149

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