|
Media Inquires:
Steven Kenney
skenney@hcm.hitachi.com
603-669-4347, Ext. 229
Hi-Net 350TM and SupraTM Cables Offer
Guaranteed Delay Skew Headroom
 Manchester,
NH July 2002: Hitachi
Cable Manchester’s engineers have investigated the role of
signal timing in data transmission and are recommending that the
existing TIA and ISO propagation delay and delay skew requirements
may not be stringent enough to support new applications. In particular,
since delay skew affects signal timing and the re-fresh rate of
transmitted data, the quality of video transmission (where red,
green, and blue color channel information is transmitted over
different pairs) could benefit from reduced delay skew. It is
probable that, in order to deliver optimum picture quality, future
video applications will require significantly better channel delay
skew than the 50 nanosecond limit imposed by the TIA standards.
In response to the findings, Hitachi Cable developed a design
strategy to reduce the maximum delay skew in their premium cables
at no additional cost to the customer. The enhanced design, which
optimizes the electrical properties of the insulation dielectric
and the copper conductor to best match signal propagation speeds
between the cable pairs, employs FEP on all pairs to avoid having
to compensate for skew introduced by mixed dielectrics. The result
is a design with over 45% less delay skew than the standards’
specified worst case. To ensure next generation applications support,
Hitachi Cable guarantees that the maximum delay skew on their
Hi-Net 350TM (category 5e with headroom) and Hi-Net
SupraTM (category 6 with headroom) cables shall not
exceed 25 nanoseconds.
Please refer to the technical feature in this month’s CableManiaTM
magazine or contact your Customer Service Representative at:
(603) 669-4347 for additional information.
To learn more about other Hitachi Cable
products, visit the company website at http://www.hcm.hitachi.com. |
