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Telephone line voltage

aioli13 -  
 dani -
Hello,
I would like to know the various voltages found on a telephone line as well as their forms (DC/AC) 
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Anonymous user
 
On a a classic France Télécom line: 48 volts direct current and the ringing signal is 80 volts alternating current.
On an ADSL line, there are frequencies, but I don't know the value which should be close to 0.

Have a nice day.
30
aioli13
 
Hello. Thank you for the information, that is enough for me.
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