systems:phones
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Table of Contents
Telephone Line Parity
From: http://en.wikipedia.org/wiki/Tip_and_ring
Tip has a potential of 0 volts with respect to ground, while the battery side carries a DC potential of −48V when in the on-hook (idle) state (nominally −50 volts in the UK).
From: http://wiki.answers.com/Q/What_is_Phone_line_polarity
The red wire is the "ring" or negative wire. The green wire is the "tip" or positive wire.
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systems/phones.1369159366.txt.gz · Last modified: by superwizard