high voltage in DSL phone cable

webtek · Post by **webtek** » Thu May 24, 2001 10:35 pm

I noticed a spark while I was plugging in my phone line to the external DSL modem. I got curious and dusted off the ol' multimeter to discover that there is 51.5v on the line!

Is this right?

webtek · Post by **webtek** » Fri May 25, 2001 2:33 pm

...are there no telecommunciation technicians here?

alkxy74 · Post by **alkxy74** » Fri May 25, 2001 4:20 pm

I'm no telephone tech, but that is pretty standard. My home line POTS line is at 40V DC to ground. My DSL dry wire is 49V DC to ground.

webtek · Post by **webtek** » Fri May 25, 2001 5:31 pm

thanks for the info. i wish i'd known that before i placed the connector on my tongue to see if it was live. OUCH!!!

Stef · Post by **Stef** » Fri May 25, 2001 8:46 pm

Voltage won't kill you, but current will.

Stef

jpalminteri · Post by **jpalminteri** » Wed May 30, 2001 8:37 pm

Typical POTS voltages are as follows:

Dial tone voltage 48 VDC

Ringing voltage 90 VAC

Any suspected trouble, check and/or substitute the DSL splitter or filter to ensure proper isolation.

SG Broadband Community

high voltage in DSL phone cable

high voltage in DSL phone cable

Telecomm Techs

thanks

POTS voltages are standard!!!