Another All Circuits Error

Thread Starter

CATV

Joined Apr 17, 2007
11
If you are continuing to revise, I noticed a mistake in the safety chapter when you said that telephone ring voltage is 48V. In fact, US phone systems use -48V battery but ringing is often 130V 20Hz AC or variations of.

The series is great and I have used it as a resource to train my employees. WELL DONE!!
 

Dave

Joined Nov 17, 2003
6,970
If you are continuing to revise, I noticed a mistake in the safety chapter when you said that telephone ring voltage is 48V. In fact, US phone systems use -48V battery but ringing is often 130V 20Hz AC or variations of.

The series is great and I have used it as a resource to train my employees. WELL DONE!!
Hi CATV,

Can you provide a link to the chapter you are refering to?

Dave
 
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