Patch Panel Termination
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Posted by Justin on September 7, 2005, 4:40 pm
Please log in for more thread options Tomi Holger Engdahl wrote: [SNIP] >
>>But will it effect Cat5e performance, absolutely. If the
>>components in this install are Cat5e, I would expect these cables to >>fail the test. >
I don't doubt that the cables shown in the pictures would pass Cat5.
> > I think that doing the installation where the jackets were > removed for few centimeters distance and all wire pairs packed > togehter as shown on earlier posted link, the individual > cables might well pass the CAT5e performance tests when tested > individually (if not anymore CAT5e, then most propably still > CAT5). The perfomance when measuring single cable should have > not changed radically if no considerable mecahnical damage is > not done (wire pairs from one cable keep grouped/teisted together > as they were inside jackets, the cable fasteners not overtightened > etc..). The only neasurement where I would expect noticeable > change is cable to cable crosstalk figures. Those are poorer > than with the installation that keeps the jackets on the wire > pairs as close to the terminating point as possible. > I've tested some very sketchy cables and they passed Cat5. But that's another story. Yes, crosstalk is definatly where I have seen problems with this type of install. And in the real world you're not going to see a single cable install. Also, this single point would probably not be enough to fail a Cat5e certification, but seeing this type of install would make me question the rest of the installation and make me wonder at what other point may there issues. So the cumulative effect would be a failed link. | |||||||||||||||||||||||||||||||||||||
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Posted by Robert Redelmeier on August 29, 2005, 7:30 pm
Please log in for more thread options > Are network seems notorious slow to me. We have 2 bonded T1's
> to the internet and all 70 users here access a web based app > to do almost all their work. Ping times are alway below 100ms > and when I check our internet utilization we occassional max > out but not for longer than 10 seconds at a time maybe once or > twice a day. The Cisco switchess dont see any CRC's and all > the machine NICS and ports on the switch are forced to 100/full. > Could the patch panel termination be casuing this slow down.
Unlikely. Although jackets should not be that stripped, I haven't heard of it causing trouble so long as the pairs are kept twisted. I would expect to see CRC errors from bad cabling. You can test with `ttcp`. There may be some software issue, like an overloaded DNS or NetBIOS running. -- Robert | |||||||||||||||||||||||||||||||||||||
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Posted by Brad on August 29, 2005, 12:46 pm
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Thanks Robert....thats' the response I was hoping to hear....I really didnt want to have to rerun all the cables....but if it were the cause of my issue, I would without hesitation. Brad | |||||||||||||||||||||||||||||||||||||
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Posted by Robert Redelmeier on August 29, 2005, 8:00 pm
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> Thanks Robert....thats' the response I was hoping to hear....I
> really didnt want to have to rerun all the cables....but if it > were the cause of my issue, I would without hesitation. Oh, you should bring someone in with a certification scanner long before doing anything as tough as recabling everything. -- Robert | |||||||||||||||||||||||||||||||||||||
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Posted by Mark Evans on September 9, 2005, 12:23 pm
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> > Are network seems notorious slow to me. We have 2 bonded T1's
> > to the internet and all 70 users here access a web based app > > to do almost all their work. Ping times are alway below 100ms > > and when I check our internet utilization we occassional max > > out but not for longer than 10 seconds at a time maybe once or > > twice a day. The Cisco switchess dont see any CRC's and all > > the machine NICS and ports on the switch are forced to 100/full. > > Could the patch panel termination be casuing this slow down.
> Unlikely. Although jackets should not be that stripped,
Without using the right tool, by the looks of things. > I haven't heard of it causing trouble so long as the pairs
> are kept twisted. And the cable ties are not too tight. Which is another reason for leaving the jackets on. -- Mark Evans St. Peter's CofE Aided School Phone: +44 1392 204764 X109 Fax: +44 1392 204763 | |||||||||||||||||||||||||||||||||||||
