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From: "Justin Farrelly"
Subject: Re: Twisted Pair High Data Rate Design
Date: Sun, 13 Oct 2002 17:46:34 +0000 (UTC)
Organization: BT Openworld
NNTP-Posting-Date: Sun, 13 Oct 2002 17:46:34 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2720.3000
Using ghost power already at 48VDC. We have about 200mW to play with
due to architecture constraints on the physical layer/TX power side for a
duplex circuit. Current design methodology uses Spartan to do all the work,
although that takes a wedge of power to crank up, we are OK on running
power (just). Most PHY soloutions seem to be around about a watt...
Ideally I am trying to find an ultra low poer soloution, and am concidering
adapting some of the current wireless devices such as the new chipset from
Xtreme Spectrum (dumping the RF side).
If you know of any ultra low power devices, or any really good transmission
engineers looking for a project.....
"Allan Herriman" wrote in message
> On Sat, 12 Oct 2002 18:04:17 +0000 (UTC), "Justin Farrelly"
> >Needs to be very low power balanced transmission. Distance 50M to 100M
> >reliable, occupied data rate will be about 12Mbits/sec if synchronous,
> >15Mbits/sec async. It does not need to support a lot of the Ethernet
> >protocol overhead, being used to transmit real time data from high bit
> >sensor. Current approaches are discrete, but I am looking for a packaged
> >TX/RX soloution to avoid another fully discreet design. Most current high
> >rate stuff (100M, etc) gulps power quicker than we can supply it!
> With a high enough voltage, you can supply several watts using phantom
> power over the same twisted pair. An Ethernet transceiver doesn't use
> anything like that amount of power. You can also get standalone
> Ethernet PHY chips, so you don't need to deal with "protocol
> >"Mike" wrote in message
> >> "Justin Farrelly" wrote in message
> >> news:firstname.lastname@example.org...
> >> > If anyone knows of a company or design engineer (professional) with
> >> > experience in syncronous data over twisted pair at rates exceeding
> >> > please let me know or point me in the right direction... much
> >> There are companies currently working on 10Gb/s over CAT-5 twisted
> >> Times just published an article about some of the companies that are
> >> on it:
> >> http://www.eetimes.com/story/OEG20021004S0056
> >> This seems like overkill if you're simply looking to exceed 15MB/s, but
> >> something like 100Mb/s Ethernet doesn't, and almost everyone does that.
> >> you doing something special, that won't work with Ethernet? Is your
> >> 15Mbits/s, or 15Mbytes/sec?
> >> -- Mike --
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