Agilent Technologies N5980A Manual do Utilizador descarregar pdf (Página 11)

Table 15: Specifications for tunable loop bandwidth (only for

option CTR, UTR)

Tunable loop bandwidth 500 kHz to 12 MHz for data rates

1.46 Gb/s to 12.5 Gb/s

100 kHz to 4 MHz for data rates

1 Gb/s to 1.46 Gb/s

Loop bandwidth accuracy 10% typical

Transition density 25% to 100%. The CDR can auto-

compensation matically detect the transition den-

sity of the incoming data pattern

and compensates the loop band

width accordingly.

Tracking range (SSC) + 0.05 % to -0.55% (5500 ppm)

deviation of data rate. User can

disable/enable SSC tracking. Loop

bandwidth >1 MHz and medium or

max. peaking enabled.

Jitter peaking 3 customer selectable values

between 0 and 3 dB; see

frequency response in figure 18.

Fine adjust manual adjustment -1.0 to + 1.0 of

CDR settings to minimize CDR

output jitter.

Compliant CDR settings PCIe, SATA, FC, FB-DIMM, CEI, GE,

10 GbE, XAUI, XFP/XFI, SONET

OC-48/192 (see figure 19). User

can add own CDR settings.

At transition density 50%

J-BERT N4903A High-Performance Serial BERT Data Sheet

BER result display

The N4903A error detector measures:

1. BER

2. Accumulated BER results

• Accumulated errored O’s and 1’s

• G.821

• Error-free intervals

• Accumulated parameters

• Burst results

3. Eye results

Eye diagram result display

• 1-/0- level

• Eye height/amplitude/width

• Jitter p-p and rms

• Cross voltage

• Signal to noise ratio

• Duty cycle distortion

• Extinction ratio

Figure 18: Three selectable frequency response settings. The

example shows loop bandwidth of 900 kHz and 0 dB, 1.2 dB,

2.8 dB peaking.

Specifications-Error Detector

CDR with tunable loop bandwidth

(only with N4903A options CTR, UTR)

Figure 19: Compliance settings for CDR

The standard allows 11 MHz to 22 MHz.

CEI standard allows data rates of 4.976 to 6.375 Gb/s and 9.95

to 11.1 Gb/s.

XFP/XFI standard allows data rates of 9.95 to 11.2 Gb/s.

Figure 17: CDR loop bandwidth

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18

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