Phantom CAT5 Wiring Problems ?
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Posted by on July 6, 2007, 12:21 pm
Please log in for more thread options We have problems sending out data (emails with attachments, ftp transfers etc...) from our ethernet network. We have full download speeds of over 5mbps, but our upload speeds are >100kbps.
We are receiving our internet connection from another building in the commercial center we are in. We've isolated the problem to a CAT5 cable running in a metal conduit under the parking lot. We isolated this by testing the speed at various points in the network. Computers before these cables run fine, but all of them after have these slow upload speeds. The strange part is that there are five (5) CAT 5's ran through that conduit, and all of them are having the same strange problem. We only use one, but tested them all. Do you know what could cause this kind of data loss, but only in one direction? I was thinking the conduit filled up with water, but why doesn't it affect the speed both ways? Thanks in advance for any insight you can offer... Jacob | ||||||||||||||||||||||
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Posted by Robert Redelmeier on July 6, 2007, 8:48 pm
Please log in for more thread options jacob@ayresgroup.net wrote in part: > We have problems sending out data (emails with attachments,
> ftp transfers etc...) from our ethernet network. We have full > download speeds of over 5mbps, but our upload speeds are >100kbps. This is normal behaviour for networks with a cable or ASDL uplink. But I'm guessing you've got a T-1 or T-3. > We are receiving our internet connection from another building in
> the commercial center we are in. We've isolated the problem to > a CAT5 cable running in a metal conduit under the parking lot. Hazardous to equipmen since nearby lightening strikes will create a gound potential difference between the different buildings ground-stakes. > We isolated this by testing the speed at various points in
> the network. Computers before these cables run fine, but all > of them after have these slow upload speeds. > The strange part is that there are five (5) CAT 5's ran through
> that conduit, and all of them are having the same strange problem. > We only use one, but tested them all. > Do you know what could cause this kind of data loss, but only in
> one direction? I was thinking the conduit filled up with water, > but why doesn't it affect the speed both ways? If it isn't asymmetric network (and other stations seem to confirm it is not), then the symptoms are prefectly consistant with a split pair. One direction is fine, the other crappy. Find the ends of the cable outside the conduit. Are they plugs? Or are they jacks (female)? Check the color code. If they are plugs, look carefully through the plastic and read off the colors. If these have been field crimped by an inexpert person, it is likely they were improperly arranged, splitting a pair. Electrons may be color blind, but they know who their dance [twist] partners are. The correct crimpings are non-intuitive. -- Robert | ||||||||||||||||||||||
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Posted by Dan Chatha on July 8, 2007, 8:20 am
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Robert Redelmeier wrote: > jacob@ayresgroup.net wrote in part:
> > We have problems sending out data (emails with attachments,
> > ftp transfers etc...) from our ethernet network. We have full > > download speeds of over 5mbps, but our upload speeds are >100kbps. >
> This is normal behaviour for networks with a cable or > ASDL uplink. But I'm guessing you've got a T-1 or T-3. > > > We are receiving our internet connection from another building in
> > the commercial center we are in. We've isolated the problem to > > a CAT5 cable running in a metal conduit under the parking lot. >
> Hazardous to equipmen since nearby lightening strikes will > create a gound potential difference between the different > buildings ground-stakes. > > > We isolated this by testing the speed at various points in
> > the network. Computers before these cables run fine, but all > > of them after have these slow upload speeds. >
> > The strange part is that there are five (5) CAT 5's ran through
> > that conduit, and all of them are having the same strange problem. > > We only use one, but tested them all. >
> > Do you know what could cause this kind of data loss, but only in
> > one direction? I was thinking the conduit filled up with water, > > but why doesn't it affect the speed both ways? >
> If it isn't asymmetric network (and other stations seem to > confirm it is not), then the symptoms are prefectly consistant > with a split pair. One direction is fine, the other crappy. > > Find the ends of the cable outside the conduit. Are they plugs? > Or are they jacks (female)? Check the color code. If they are > plugs, look carefully through the plastic and read off the colors. > > If these have been field crimped by an inexpert person, it > is likely they were improperly arranged, splitting a pair. > Electrons may be color blind, but they know who their dance > [twist] partners are. The correct crimpings are non-intuitive. > > -- Robert mycomputer > properties > device manager > network adapter > your lan
the value to Auto full duplex.
card > select properties > select from link speed and duplex > change see if that work by changing value regards Adnan | ||||||||||||||||||||||
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Posted by Dan Chatha on July 8, 2007, 8:22 am
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Dan Chatha wrote: > Robert Redelmeier wrote:
> > jacob@ayresgroup.net wrote in part:
> > > We have problems sending out data (emails with attachments,
> > > ftp transfers etc...) from our ethernet network. We have full > > > download speeds of over 5mbps, but our upload speeds are >100kbps. > >
> > This is normal behaviour for networks with a cable or > > ASDL uplink. But I'm guessing you've got a T-1 or T-3. > > > > > We are receiving our internet connection from another building in
> > > the commercial center we are in. We've isolated the problem to > > > a CAT5 cable running in a metal conduit under the parking lot. > >
> > Hazardous to equipmen since nearby lightening strikes will > > create a gound potential difference between the different > > buildings ground-stakes. > > > > > We isolated this by testing the speed at various points in
> > > the network. Computers before these cables run fine, but all > > > of them after have these slow upload speeds. > >
> > > The strange part is that there are five (5) CAT 5's ran through
> > > that conduit, and all of them are having the same strange problem. > > > We only use one, but tested them all. > >
> > > Do you know what could cause this kind of data loss, but only in
> > > one direction? I was thinking the conduit filled up with water, > > > but why doesn't it affect the speed both ways? > >
> > If it isn't asymmetric network (and other stations seem to > > confirm it is not), then the symptoms are prefectly consistant > > with a split pair. One direction is fine, the other crappy. > > > > Find the ends of the cable outside the conduit. Are they plugs? > > Or are they jacks (female)? Check the color code. If they are > > plugs, look carefully through the plastic and read off the colors. > > > > If these have been field crimped by an inexpert person, it > > is likely they were improperly arranged, splitting a pair. > > Electrons may be color blind, but they know who their dance > > [twist] partners are. The correct crimpings are non-intuitive. > > > > -- Robert >
> > > mycomputer > properties > device manager > network adapter > your lan > card > select properties > select from link speed and duplex > change > the value to Auto full duplex. > > see if that work by changing value > > > regards > > Adnan from auto to full duplex | ||||||||||||||||||||||
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