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#191142 - 12/19/09 02:08 AM what is "two line over line" telephone wiring?
bigpapa Offline
Member
Registered: 03/18/06
Posts: 77
Loc: canada
What does this term mean when referring to telephone cabling?


Edited by bigpapa (12/19/09 02:10 AM)
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#191159 - 12/19/09 05:18 PM Re: what is "two line over line" telephone wiring? [Re: bigpapa]
EV607797 Offline
Member
Registered: 10/25/06
Posts: 744
Loc: Fredericksburg, VA, USA
Never heard of it and I'm in the phone business. Sounds like maybe someone trying to describe ISDN-BRI or DSL. Either way, it just uses standard twisted pair wiring, CAT3 is more than sufficient for these services.
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#191256 - 12/23/09 02:31 AM Re: what is "two line over line" telephone wiring? [Re: EV607797]
mhulbert Offline
Member
Registered: 10/19/04
Posts: 132
Loc: Anaheim, CA USA
Sounds like a "pair gain" term.
Read some stuff about it here: http://en.wikipedia.org/wiki/Pair_gain
They don't mention a "DAML" which I've run across. I'd guess it's a Digital multiplexor. Basically you get one pair from the CO, and it gives you 2 POTS lines. Careful, the pair from the CO has 100+ VDC on it!
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#194386 - 05/28/10 05:46 PM Re: what is "two line over line" telephone wiring? [Re: mhulbert]
Tiger1vic Offline
New Member
Registered: 05/28/10
Posts: 6
Loc: Canada
An "overline" is telco terminology for an additional phone number on the same line - as in when a business has 2 lines but only one receptionist. Both numbers ring on the same phone.
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