[SI-LIST] Re: High speed serial links over copper cables
- From: Hassan O. Ali <hassan@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>, <jhasson@xxxxxxxxxxxxxxxxxxx>, Neo <neoflash2008@xxxxxxxxx>
- Date: Wed, 12 Aug 2009 13:33:11 -0400
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Hi Han,
The equalizers are usually placed at the cable ends so that they
have an easy access to power supply.
Best regards.
Hassan.
On Tue 08/11/09 9:15 PM , Neo neoflash2008@xxxxxxxxx sent:
Hi Hassan:
For those active cables, where the equalizer usually sitting?
In the middle of the cable, or in the both ends of the cable?
Regards,Han
--- On Mon, 7/20/09, Hassan O. Ali wrote:
From: Hassan O. Ali
Subject: [SI-LIST] Re: High speed serial links over copper cables
To: si-list@xxxxxxxxxxxxx [3], jhasson@xxxxxxxxxxxxxxxxxxx [4]
Date: Monday, July 20, 2009, 3:23 PM
??? ? BODY { font-family:Arial, Helvetica,
sans-serif;font-size:12px; }
JF,
??? Three points:
??? 1. You can find several twinaxial cable offerings that are
lighter
than Belden 1694A coaxial cable and have them operate at 2.5Gbps
differentially over a 10m length. Some popular bulk twinaxial cable
makers: Amphenol Spectra-Strip, WL Gore, Madison Cable, and Leoni.
For
some standard connectors, you can also obtain cable assemblies from
such companies as Amphenol, Molex, Tyco Electronics, WL Gore, and
Leoni.
??? 2. Most off-the-shelf PHYs designed to operate serial links
differentially e.g. for XAUI, can also work in single-ended format
e.g. using only the positive terminal and terminating the negative
terminal with a 50-ohm load. The PHYs do not have to be designed for
SMPTE.
??? 3. If the PHY of your interest cannot support the 10-meter cable
length, you can use several off-the-shelf cable equalizers on your
board or use active (equalized) cables.
??? If you need more info on the above, please contact me directly.
??? Best regards.
??? Hassan.
On Mon 07/20/09 2:05 AM , jhasson@xxxxxxxxxxxxxxxxxxx [5] sent:
? Hi,
I have been looking at the possibility of setting up a high speed
(about
2.5Gbit/s) serial link over a 10 m copper cable. In order to reduce
weight
and number of cables, a focus was given to single ended options. The
standard that comes up is SMPTE424M running at up to 2.97Gbit/s over
a
long (much more than 10 m) 1694A belden coaxial cable. I would like
to be
able to use the physical layer but not to transmit video. Is there a
drawback in using chips for SPMTE424M while for instance using the
8B/10B
encoding instead of SMPTE scrambling ? I would not encounter the
pathological data (the standard DC blocking capacitor could be
reconsidered) then but are there any tricks to consider that would
impact
the link ? As a more general question, how come only video field
seems to
have developped high speed single ended video transmission ?
Best regards,
JF
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