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Agilent N4960A Serial BERT 32 and 17 Gb/s

Fast, compact, and affordable BER testing

Testing 16x Fibre Channel (16GFC) transceivers, Infiniband FDR,

Infiniband EDR, 100 G Ethernet etc, requires equipment capable of

operating up to at least 25 Gb/s, with accurate characterization to strict

tolerances. Until now, these systems have been extremely expensive. This

often results in multiple designers needing to share the one serial BERT in

the lab, delaying their characterization and development schedule.

The Agilent Technologies N4960A serial BERT 32 and 17 Gb/s is an

affordable alternative for R&D working at data rates up to 32 Gb/s.

The solution is compact, allowing it to be easily transported throughout

the lab and manufacturing. But with its low price, a fraction of competing

stressed BERTs, you can afford to put one on each bench.

Figure 1: 16 x Fibre Channel (16 GFC) transceiver testing

Compact architecture

The N4960A serial BERT controller is a platform that forms the basis of

the stressed serial BERT. The N4960A serial BERT controller adds the

precision timing and control required for the remote pattern generator and

error detector heads.

The concept of remote heads, first introduced in the N4965A multi-

channel BERT, puts the pattern generation and error detection near the

device under test, eliminating long cables which degrade the signal. This

is especially important at higher data rates.

Affordability without compromise

The N4951A/B pattern generator and N4952A error detector remote

heads are available in two data rate ranges covering either 4 to 17 Gb/s

5 to 32 Gb/s with no gaps or missing data rates. They generate and test

full rate patterns directly without the need for external multiplexers and

delay matching often used in other modular BERT systems.

The signal fidelity in the eye is outstanding, owing to the use of custom-

designed and built output amplifiers. Output parameters of amplitude,

offset, and termination voltage are user settable.

Figure 2: Typical eye at 14 Gb/s

Accurate, repeatable jitter tolerance

The N4960A serial BERT controller contains an accurately calibrated

sinusoidal jitter source capable of high deviation at low frequencies, and

lower deviation at frequencies up through 200 MHz. A second sinusoidal

jitter source, plus random jitter source and spread spectrum clocking can

be added with option -CJ1.

Integrated analysis software

Support for both models of the N4960A is included in the N4980A

multi-instrument BERT software. The software provides an intuitive user

interface. It also provides single or multi-channel BER measurement

capability with an unlimited number of channels. Setup is so easy that

you’ll be testing in seconds.

The optional JTOL measurement package in the N4980A multi-instrument

BERT software (Signal Integrity Studio) performs all the set-up and control

for single or multi-lane JTOL, and with an intuitive “point and click”

template editor.

Figure 3: N4980A JTOL measurement window

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