Agilent Technologies 8922M, S GSM manual Trigger in Measure, Valid Demodulation OUT

18.TRIGGER IN (MEASURE)

Connectors

Front-Panel Connectors of the Agilent Technologies 8922M/S

The measurement trigger input is the trigger source for the oscilloscope, spectrum analyzer (option 006), Pwr Ramp, Phase/Freq and Data demodulation.

All triggered measurements, when trigger is selected as external, are triggered by this signal.

It is not possible to separately trigger an oscilloscope or spectrum analyzer measurement from a Pwr Ramp measurement.

TRIGGER IN is selected when the digital demodulator’s Trig Source is set to Ext Meas, or when the measurement synchronization Trig Source is set to Ext Meas.

See Also	Screens: Phase Freq, Pwr Ramp, Oscilloscope, Spectrum
	Analyzer

19.VALID (DEMODULATION OUT)

(Agilent 8922M Only)

This connector is connected to the DSP analyzer’s digital demodulation data valid output.

This signal is the digital demodulation data valid signal which is generated when digitally demodulating one out of eight timeslots of GSM 0.3 GMSK modulation. It can be used to load the digitally demodulated data. This signal is used for gate timing when the demodulation output data-signal and the demodulation output clock-signal are valid.

This output is only active while outputting, not while demodulating, and it is only active when the digital demodulation mode is selected and armed.

This connector is connected directly in parallel with DEMOD_VALID on the SYSTEM BUS connector.

Specifications	High drive: 1 mA Low drive: 1 mA Active level: LOW Active
	for: leading tailbits, first half of data, midamble, second half of
	data, and trailing tailbits. Inactive for: guard bits Duration
	depends on type of burst being demodulated.
See Also	Screens: Cell Control 2 Specifications Signal Descriptions for
	the System Bus

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