[SI-LIST] Re: cat 6 RJ45 jack for PCB

Jan,

Since this is an industrial machine application you may want to conceder
using a better connector. After all, if there is a lot of vibration or
if the environment is not office clean, the RJ45 may not be a good
choice. For example we would never use it in a vehicle.

In the automotive industry we use a FAKRA connector. It is a SMB
connector with a plastic latching housing. Here is a link to the Huber
and Suhner web site. They have great connector, but the price is a
little high. There are lower cost vendors that can be found, but I like
their parts.

http://www.hubersuhner.com/hs-p-rf-con-gr-series-arc

Best regards,

John



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-----Original Message-----

From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of jan.vercammen1@xxxxxxxx
Sent: Friday, June 23, 2006 5:49 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] cat 6 RJ45 jack for PCB

si-list,

I have a colleague who experiences problems with 660Mbit/s LVDS on a cat
6=20
S/STP=20
cable (stranded coaxial overall shield, differential pairs are foil=20
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=20
500-1000ns)-->
relock but some -->bit errors-->works. The errors hard to or impossible
to=20
reproduce on a test bench
and they seem to occur at random.=20

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=20
(differentially). Crosstalk
measurements have not been performed.

After checking the connector we found it to be cat 5, it is specified
for=20
NEXT to only 100MHz.
The connector NEXT is much worse than the cable next, for example cable=20
NEXT is
90dB at 100MHz but only 40dB for the connector.

Because the cable contains both transmit and receive we wonder if we
need=20
to improve
the connector. Currently we are using a Tyco RJ45 connector (partnumber=20
406549-1), which
is cat 5.

I searched the web but I find a large number of dstributors and Tyco
does=20
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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