Agilent Technologies J-BERT N4903B Bedienungsanleitung PDF herunterladen (Seite 20)

Error Detector Speciﬁcations

Trigger output (TRIG OUT)

Pattern trigger mode

This provides a trigger synchronized with the selected error

detector reference pattern. In pattern mode the pulse is synchro-

nized to repetitions of the output pattern. It generates 1 pulse for

every 4th PRBS pattern.

Divided clock mode

In divided clock mode, the trigger is a square wave.

Table 25. Speciﬁcations for trigger output

Clock divider 4, 8, 16 up to 11 Gb/s

32, 40, 64, 128 up to 12.5 Gb/s

Levels High: +0.5 V typical

Low: - 0.5 V typical

Minimum pulse width Pattern length x clock period/2

e.g. 10 Gb/s with 1000 bits = 50 ns

Interface DC coupled, 50  nominal

Connector SMA female

Error output (ERR OUT)

This provides a signal to indicate received errors. The output is

the logical ‘OR’ of errors in a 128 bit segment of the data.

Table 26. Speciﬁcations for error output

Interface format RZ, active high

Levels High: 1 V typical

Low: 0 V typical

Pulse width 128 clock periods

Interface DC coupled, 50  nominal

Connector SMA female

J-BERT measurements

• BER results

• Symbol error ratio (SER) and calculated BER (Option A02)

• Frame error rate (FER) analysis (Option A02)

• BER results with filtering of 8b/10b coded filler symbols or

128b/130b coded SKPOS symbols (Option A02)

• Accumulated BER results

◦ Accumulated errored O’s and 1’s

◦ G.821

◦ Error-free intervals

◦ Accumulated parameters

◦ Burst results

• Eye diagram results

◦ 1-/0- level

◦ Eye height/amplitude/width

◦ Jitter p-p and rms

◦ Cross-over voltage

◦ Signal to noise ratio

◦ Duty cycle distortion

◦ Extinction ratio

• Measurement suite

◦ BERT scan with RJ/DJ separation

◦ Spectral jitter decomposition

◦ Eye contour

◦ Quick eye diagram and BER contour

◦ Fast eye mask

◦ Output level and Q factor

◦ Error location capture

◦ Fast total jitter

• Pattern capture

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