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Effects of a Split Pair?
#446449 08/15/07 08:39 AM
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tylan Offline OP
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I'm mainly a computer tech, but I'm learning phone systems...

The other day one of our installers tried to install a KSU, but the client's site was wired very poorly. To top if off there were lightning storms in the area. Needless to say they stopped the install.

When they were left site, the original house analog phones could pickup a dial tone and dial, but could not answer an incoming call. When they would pick up the incoming call there would be dead air.

I think this is purely a Verizon issue, but the Verizon tech pointed the finger at my guy. Could this be caused by my guy a splitting a pair? Such as having an analog phone hooked to the TIP of L1 and RING of L2?

I tried to duplicate this with a butt set and I was unable. What happens if you mix the TIP of 1 line with the RING of another line (or vice versa)?


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Re: Effects of a Split Pair?
#446450 08/15/07 08:56 AM
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What you are experiencing is exactly what happens with a split pair scenario. The call is ringing in on the correct "ring" wire, but the set is not connected to the correct "tip" wire to answer the call.

It sounds like your guys checked for dial tone when they left, which you will get even with a split pair. I think it's safe to assume that your guys had something to do with it.


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Re: Effects of a Split Pair?
#446451 08/15/07 09:04 AM
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tylan Offline OP
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DOH!

When I tried to get dial tone on a split pair at my office I couldn't do it. I just got dead air. Is that because the polarity check on my butt set?


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Re: Effects of a Split Pair?
#446452 08/15/07 09:22 AM
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No, polarity doesn't matter with a butt set. It depends upon how the lines are brought to the service area. If they arrive over traditional copper, you will get what is happening at the site, but the lines will be noisy. If they are being served by pair gain equipment, you will probably get the same thing without the hum. Then again, different pair gain electronics behave in different ways, so yours may be from equipment that won't provide dial tone on split pairs.

In general, the tip side of the line eventually ends up grounded in the central office. The ring side of the line carries all of the "business", like ringing voltage, the phone number itself, etc. You can even connect a butt set from the ring side of the line to a ground and get a working line, albeit noisy.


Ed Vaughn, MBSWWYPBX
Re: Effects of a Split Pair?
#446453 08/15/07 09:28 AM
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tylan Offline OP
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Come to think of it.. Our office has Verizon Centrex lines. That could be the difference you are referring to.

Thanks for your quick replies! This telecom newbie appreciates it.


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Re: Effects of a Split Pair?
#446454 08/17/07 03:57 PM
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Centrex is a billing/programming differentiation, the dialtone and everything else is the same.


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