LANDENBERG, PA – W. L. Gore & Associates, Inc. has developed “Limiting Port” SFP+ assemblies that are fully compliant with the SFF-8431 Revision 4.1 specification, Chapter 3, specification for limiting modules. Gore has developed this low cost, low power, passively equalized cable through the use of its patented GORE™ EYE-OPENER+® Conductor Technology and an extremely low loss expanded PTFE cable dielectric.
Gore’s SFP+ offering provides a lower cost alternative to active copper technology and expensive optical transceiver modules. This product satisfies the limiting port specification up to seven meters, without using active technology.
SFP+ limiting ports are not required to provide EDC (Electrical Dispersion Compensation) on the receive side. Eliminating this chip or function has been projected to save $15 per port. Unfortunately, the loss of this function severely limits the distance over which traditional passive copper solutions can interoperate to less than one meter. Integrators have been required to purchase active copper or optical transceivers to satisfy the standard. GORE™ Limiting Port SFP+ Assemblies are specification-compliant up to seven meters. This seven-meter length spans a significant portion of the total interconnect-space required for typical high-performance computing environments.
The core/skin design of GORE™ EYE-OPENER+® Conductors provides a distributed or “per unit length” equalization without resistor-inductor-capacitor (RIC) circuitry required on the connector paddle card. Jitter is well known to be the limiting factor for maximum signal transmission length in modern systems. Jitter is reduced in equalized cables because the transfer function (frequency response) of the cable is “flattened” in the appropriate frequency band.
W. L. Gore & Associates, Inc.
Filed Under: Cables + cable management
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