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Distributor

FIBRE CHANNEL

DUAL TRANSFORMERS

For Use with 75

Ω Coaxial or

150

Ω STP Cable

Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product

names mentioned herein may be trademarks or registered trademarks of their respective owners.

A101.A (10/99)

Printed on recycled paper. ©1999, Pulse Engineering, Inc.

Application Notes:

Fibre channel is a bi-directional point-to-point serial data

link, structured for high performance transmission. To

allow low cost interconnection between supercomputers

and high-end peripherals, the ANSI X3T9.5 FC-0

Committe has specified coaxial and STP cable

interconnects as an alternative to optical fibre cable.

Although the transmission distance through alternative

cable is limited in distance, it offers a significant cost

advantage over the optical fibre interface. Pulse has

designed the fibre channel dual transformers specifically

for point-to-point coupling to shielded twisted pair (STP)

and coaxial cable. This transformer series complies with

the ANSI X3T9.5 FC-0 specification over 133, 266, and

531 Mbps data rates over distances of up to 100 meters

on coaxial and STP cable.

The isolation transformers protect the station from static

charges that may develop on the cable and prevent

ground loop currents from being transferred between

stations. When coaxial links are used, the transformers

also provide a balance to single-ended connections

between the transmitter/receiver IC and the coax.

The devices have also been designed to provide

common mode rejection within the transmission band

and thus reduce EMI. The wide bandwidth of these

devices minimizes data dependent jitter by providing fast

signal rise times. In addition, use of the proper

transformers will provide sufficient low end bandwidth

to minimize baseline wander, another contributor to jitter.

Low end bandwith is a function of the channel impedance

and the primary inductance of the transformer.

The selection table, on the front side of this data sheet,

matches the proper transformer to the different cables

and data rates. STP cable has a 150

Ω characteristic

impedance, while the FC-0 specification also allows

the usage of RG-6, RG-58 coax and RG-179

mini-coax. Each of the coaxial cables has a 75

Ω

characteristic impedance.

The dual package allows connection of both the transmit

and receive channels, as shown in the application circuit

below. Surface mount packaging allows a cost effective

solution while providing over -40 dB of crosstalk

attenuation out to 800 MHz. The transformers are

available in either tubes or Tape & Reel packaging.

Typical Application Circuit for Coax Cable Transmission