[SI-LIST] Re: cat 6 RJ45 jack for PCB
- From: steve weir <weirsi@xxxxxxxxxx>
- To: jan.vercammen1@xxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Fri, 23 Jun 2006 04:12:45 -0700
Jan, before you attack your cables, may I suggest that you switch to
either double even mode terminations, or better, fully matched even
and odd mode terminations? I suspect that your big problem is even
mode resonances wiping out the CMIR of your receivers.
Steve.
At 02:48 AM 6/23/2006, jan.vercammen1@xxxxxxxx wrote:
>si-list,
>
>I have a colleague who experiences problems with 660Mbit/s LVDS on a cat 6
>S/STP
>cable (stranded coaxial overall shield, differential pairs are foil
>shielded). The cable is
>but 3m long. This LVDS chain is used in an industrial machine.
>
>One observes: works-->some bit-errors-->receiver cannot lock (for about
>500-1000ns)-->
>relock but some -->bit errors-->works. The errors hard to or impossible to
>reproduce on a test bench
>and they seem to occur at random.
>
>We do not know the cause but we are trying to improve the quality of the
>LVDS chain,
>
>We use SER/DES 921224/921023 and they are terminated in 100ohm
>(differentially). Crosstalk
>measurements have not been performed.
>
>After checking the connector we found it to be cat 5, it is specified for
>NEXT to only 100MHz.
>The connector NEXT is much worse than the cable next, for example cable
>NEXT is
>90dB at 100MHz but only 40dB for the connector.
>
>Because the cable contains both transmit and receive we wonder if we need
>to improve
>the connector. Currently we are using a Tyco RJ45 connector (partnumber
>406549-1), which
>is cat 5.
>
>I searched the web but I find a large number of dstributors and Tyco does
>not seem to
>offer cat 6 RJ 45 PCB jacks.
>
>
>My questions:
>-1- are category 6 PCB mounted RJ45 jacks common?
>-2- manufacturers??
>-3- any experience to share?
>
>Thank you in advance,
>
>
>Jan Vercammen
>EMC/Signal Integrity Engineer
>
>
>
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