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Applications:

Testing Transceivers Used in Fibre Channel Networks

There are three topologies in this type of network including point-to-point,

arbitrated loop, and switched fabric. The connections between devices

use transceivers for optimization. For example, in a switched fabric

topology, SFP+ (8 GFC and 16 GFC), XFP (10 Gb/s) and SFP (≤ 4 Gb/s)

are types of transceivers that connect between the switched fabric and

various devices such as storage and computing equipment. Typical pat-

terns used to test transceiver devices include PRBS series, JSPAT, and K28

series which are part of the preloaded library of patterns in the N4960A

32 G BERT.

For 16 GFC applications (14.025 Gb/s), the N4960A can perform BER

measurements and can provide a stressed pattern generator signal for

receiver tests. 16 GFC devices must be accurately characterized to strict

tolerances. The N4960A, used with the N4980A multi-instrument BERT

software, can also provide jitter tolerance tests for accurate characteriza-

tion.

A basic configuration using the 17 Gb/s BERT system is shown above.

N4951A-P17 and N4952A-E17 can be loaded with common stress pat-

terns for 16 GFC. You can also custom design your own patterns up to

8 Mb in length and upload them into the N4951A-P17 and N4952A-E17.

Figure 1 shows a typical hardware setup followed by a procedure show-

ing settings for performing a BER test.

Figure 1. For 16x Fibre Channel (16 GFC) for transceiver testing.

Figure 2. Test setup for 16 GFC.

Figure 3. Block diagram (32 Gb/s system).

N4960A

N4951A-P17

pattern generator

N4952A-E17

error detector

DUT

N4960A-CJ0/N4960A-CJ1

USB or GPIB

(N4960A-CJ1 only)

÷ n

5 to 32 GHz

2.5 to 16 GHz

RJ ﬁlter loop

Main (jittered) output

N4951A-P32

N4952A-E32

Delayed output

Divided output

∑

Low deviation modulator

High deviation modulator

Delay

SJ2

SJ1

SSC

modulator

2.5 to 16 GHz

synthesizer

10 MHz

reference

10 MHz

ref out

Ref in

10 MHz

Ext clock in

Ext jitter in

Dly clk in

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 39 40

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Agilent Technologies N4970A Manuale Utente Pagina 8

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