[ale] OT: GigE Copper specs

[Dow Hurst]

May I ask what is a punch down?  Is that cutting the cable and adding a RJ-45 
connector?
Dow


Greg Freemyer wrote:
> On Wed, 2004-04-07 at 14:43, griffisb at bellsouth.net wrote:
> 
>>Hey all, had an off-topic question about Gigabit Ethernet specs. Is it supported on Cat 5 cable, patch panels and patch cords - or is Cat5e or better required. Distance is 100 meters, correct?
>>
>>I'm seeing a lot of errors on some GigE ports at work, and beleive it to be infrasture-related.
>>
>>_______________________________________________
>>Ale mailing list
>>Ale at ale.org
>>http://www.ale.org/mailman/listinfo/ale
> 
> 
> I don't know the details, but I do know that patch panel punch down
> techniques that work for 100 Mbit don't work for GigE.
> 
> For instance, with 100 Mbit it was not unusual to unwind several inches
> of individual wires near the punch downs.
> 
> With GigE, much tighter tolerances are needed for maintaining the
> twisted pairs all the way to the punch down.  (For some reason I'm
> thinking less than 6 inches of untwisted cable cummulative over the
> end-to-end connection.  If you are using multiple punch downs, then it
> adds up quickly.)
> 
> So, if you are doing punch downs (even if you have all GigE acceptable
> components) it is easy to mis-install patch panels, etc.
> 
> Greg

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