Landline Telephone Voltage

At what voltage does landline telephone operate?

manoranjan_panda
Profile Answers by manoranjan_panda Questions by manoranjan_panda
Jul 7th, 2010
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kotiannireeksha
Profile Answers by kotiannireeksha

Aug 3rd, 2010

The normal telephone system works on -48vDC on hook when the phone goes off hook, the voltage drops to about 10v but reverses polarity.

Mayank19
Profile Answers by Mayank19

Aug 29th, 2010

I tried to measure ring voltage, and showed inside the house 34V A/C, but measuring at the NID seems to show 10V? and change. Maybe caller-ID messes up the signal? Line is -51V DC. DSL is on the same line and is perfect 6016/768 and call quality is clean.