[c-nsp] cat6 gigE

[Shaun]

I tested my gbic modules for the 2950G's by plugging two modules into the 
switch and using a pre-made patch cord, the orange light came on so I know 
the modules look to be working.  I recrimped the cable 3 times, and still 
everytime it will link up on 10/100 port but not in the gbic port.  What's 
I'm thinking about doing now is just punching it down into a connector and 
then using a short patch cord from that.  I'm looking at possibly getting a 
tester but I've heard that working with cat6 is much easier if you just 
punch it down.

any thoughts?

~Shaun


"Jason Alert" <Jason.Alert at vc3.com> wrote in message 
news:525450AD493E1E44B6B00A4A752D7DE502CB8FB6 at courier.vc3.com...
>> Cat6 is pretty much the current standard since it's considered to be
> the
>> most future proof. IMHO, it's fiber time for gigabit and up, but
> that's
>> partly because I do mostly optical transport these days :-)
>
> Cat5e makes the most sense in a majority of situations since it supports
> 1000Base-T (IEEE 802.3ab) at distances of 100 meters.  Cat6 isn't
> required for 1000Base-T as many people believe.
>
> Cat6 was developed for the 1000Base-TX (TIA/EIA-854) standard.  Both
> standards use all four pairs in the cables, but each employs a different
> transmission technique and bit rate -- 802.3ab (1000Base-T) calls for a
> 250 Mbits/sec bit rate applied bi-directionally on each of the four
> pairs, in full duplex; TIA/EIA-854 (1000Base-TX) calls for a 500
> Mbits/sec bit rate applied unidirectionally on each pair so that the
> transmit path is physically separated from the receive path.  Originally
> the use of hybrids (separates the send/receive signal) in the 1000Base-T
> chipsets made them very expensive, but the reduced cost of the
> 1000Base-TX chipsets did not offset the increased cabling cost for Cat6
> installations, so 1000Base-TX never really caught on.
>
> The next copper standard we have to worry about is 10GBase-T (802.3an),
> which requires Cat6A or Cat7 for distances of 100 meters.  While
> 10GBase-T can technically utilize Cat6, it only supports distances of 55
> meters.  Looking at the specifications, Cat6 doesn't really get you much
> in comparison to Cat5e.  You might as well go with Cat6A or Cat7 if
> you're going to future-proof your installation, so at least you'll be
> good through 802.3an.  Or even better, utilize Cat5e now for your
> 1000Base-T connections, and use fiber for 10Gbit and beyond.
>
> ~ Jason A.
>
> ______________________________________________
>
> VC3 Inc.
> Senior Engineer
>
>
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