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On a lot of the circuits I've installed, the polarity was installed wrong at the NID. I guess it isn't technically a problem with any newer telephones, but I ran into a problem with an older (70s vintage?) rotary wallmounted phone that would get DT but couldn't dial out. I found that the polarity on the jack was reversed. As wrichey said, just flip the wires on the customer side in the NID to fix the polarity issue, if you know the polarity is wrong at the NID (use the test jack to verify, if the NID has one).
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Joined: Feb 2005
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Polarity shouldn't be a problem with the old rotary phones, only the touch tone's.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Actually, there was a field modification that could be made to rotary dial phones so that they would not dial out on a reversed polarity jacks. It was through the use of a diode inside the set.
I suppose that it is possible that some old 60's-80's vintage equipment out there that may still have this diode installed. Aside from this, there is no way that polarity would matter on a standard rotary-dial set.
Ed Vaughn, MBSWWYPBX
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Joined: May 2007
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
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Scott -
I mentioned Ground Start Trunks.
Trunks & Lines: The simplest definition is that a Line originates in a machine (a switch) and terminates on a phone while a Trunk originates in a machine (a switch) and terminates in another machine (a different switch).
For example: a circuit comes from the CO switch to a PBX. When you dial "9" from a PBX phone to get an outside connection, you're seizing that Trunk. When you pick up your phone at home to get an outside connection you're seizing a LIne.
The two circuits could be (and sometimes are) technically identical (they could both be Loop Start Circuits) though there should be some technical differences between them (a trunk should be more "robust" and durable).
Sam
"Where are we going and why are we in this hand basket?"
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Joined: Dec 2002
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I've got an 2500 set with a polarity guard installed...I guess the older stuff needed it.
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Yes Jeff It did, especilly since the ability to call into bank accounts and other fun stuffed caused a battery reversal so that the dial would not work unless the guard was in place.
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Like Bill wrote, always tip to tip and ring to ring. Doesn't matter with phones anymore but it does with data, and if you get complacent with one it's liable to carry over to the other.
Jack
The question is more important than the answer.
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You guys rock! Thanks so much for the great info!
Complete noob.
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