PE-65506 Datasheet, PDF (2/2 Pages) Pulse A Technitrol Company – FIBRE CHANNEL DUAL TRANSFORMERS

FIBRE CHANNEL
DUAL TRANSFORMERS
For Use with 75 Ω Coaxial or
150 Ω STP Cable
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
For More Information :
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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.
Printed on recycled paper. ©1999, Pulse Engineering, Inc.
A101.A (10/99)