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Electrical Engineering/Fixed Landline Telephone Power Requirement.

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Question
Dear Prof Cleggsan

How much Input voltage is required for the Fixed Landline Telephone instrument to operate?.

Is there a internal Battery in the Fixed Landline Telephone instrument?.

Thanks
Prashant

Answer
http://www.edaboard.com/thread199487.html

Above discussion is very useful for you.

Simple answer is that landline phones operate on about 48 volts dc and around 90 volts for the ringing circuit.

The older phones operate off the voltage source coming from the landline phone circuits.

The newer phones often have internal batteries to power the digital displays and operate special features such as caller ID, etc.

Hope this will help.  

Electrical Engineering

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cleggsan

Expertise

All technical areas of Electronics Engineering.

Experience

BSEE, MBA, Design, R&D, University Research.
Senior Life Member of IEEE. Life Fellow of AES.

Organizations
IEEE, Consumer Electronics Society, Audio Engineering Society.
Broad teaching experience; work experience mostly in consumer electronics and conversion from analog to digital technologies. Pioneer in digital audio at all levels.

Education/Credentials
BSEE (Equiv) BYU BSEE University of North Dakota MSBA (MBA) Illinois State University Graduate Studies in Computer Science - Bradley University Graduate Studies - Ohio University Graduate Studies - University of Missouri Kansas City DeVry Tech - Electronics

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