Re: Difficulty "toning" for ports on gig switch
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Posted by Phil Schuman on August 28, 2006, 5:55 pm
Please log in for more thread options x-posted to the cabling newsgroup > My technicians have reported difficulty using any of several
toner/wand
> sets trying to find ports on Cisco gig switches. It seems that the
can
> tone becomes inaudible, or shunts/dies after a few seconds. However, > if they use the 'toner' function from one of the Fluke meters, they > hear it loud and clear, and find the port.
less
> > I tried searching on cisco.com and google before asking, but was not > able to turn up anything that described or resolved the issue. > > Some of the blades are VOIP-capable, although we're not using them for > that at this point. Others aren't, but are gig-capable blades. Or > could it have something to do with the power behind the tone being > coming from the 9V battery toner, instead of the Fluke meter?
> > Has anyone run into this issue, or have a clue what might be causing > it? > > Any insight, or guidance on where to look would certainly be > appreciated. > > | ||||||||||||||||
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Posted by Carl Navarro on August 28, 2006, 10:59 pm
Please log in for more thread options On Mon, 28 Aug 2006 21:55:50 GMT, "Phil Schuman" >x-posted to the cabling newsgroup
> >> My technicians have reported difficulty using any of several
>toner/wand
>> sets trying to find ports on Cisco gig switches. It seems that the
>> tone becomes inaudible, or shunts/dies after a few seconds. However, >> if they use the 'toner' function from one of the Fluke meters, they >can
>> hear it loud and clear, and find the port.
>> >> I tried searching on cisco.com and google before asking, but was not >> able to turn up anything that described or resolved the issue. >> >> Some of the blades are VOIP-capable, although we're not using them for >> that at this point. Others aren't, but are gig-capable blades. Or >> could it have something to do with the power behind the tone being >less
>> coming from the 9V battery toner, instead of the Fluke meter?
>> >> Has anyone run into this issue, or have a clue what might be causing >> it? >> >> Any insight, or guidance on where to look would certainly be >> appreciated. You might want to investigate the Intelliprobe 200 from Fluke. It's a digital toner. Carl "got one on the (b)leading edge and hate it" Navarro >>
>> >
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Posted by Dmitri(Cabling-Design.com on August 31, 2006, 12:56 am
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In many switches the unused pairs 1 and 4 are actually grounded or, more accurately, bonded to the switch’s ground. That would kill signal from the toner pretty effectively. Better toners can let you choose which pair to send the signal through and it should be either 2 or 3. Those pairs are not connected to the ground and for the toner look like they’re a 100 Ohm resistor which they can drive OK (would be even better if they were up in the air, but that only happens for unplugged cords) Interesting enough, you've mentioned these are Gigabit, which has all four pairs separated from the ground. However, the #1 and the #4 can still be used for power and the internal resistivity of the power circuitry can be much less than that of a transceiver and can lower the toner's signal. -- Best Regards, Dmitri Abaimov, RCDD http://www.cabling-design.com/ Home Cabling Guide, Cabling Forum, color codes, pinouts and other useful resources for premises cabling users and pros -- +-----------------------------------------------------------------+ | http://forums.cabling-design.com/ | | *** a better way to USENET *** | | no-spam Web and RSS interface to your favorite newsgroup | | comp.dcom.sys.cisco,comp.dcom.cabling - messages and counting! | +-----------------------------------------------------------------+ | ||||||||||||||||
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