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Electronics/Fixed Landline Telephone Power Requirement.

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Question
Dear ZZ

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
Let me recommend to you a couple of links that explain about your question:

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

https://answers.yahoo.com/question/index?qid=20061012014957AAHVImK

https://en.wikipedia.org/wiki/Tip_and_ring#Line_voltage

The nominal voltage used in conventional phone systems is 48v supplied by batteries kept in operation by the phone systems.  

Transistorized phones of the modern era use a 6, 9 or 12 volt internal battery to operated the electronics needed for the transistor or IC operated circuitry.  Most modern day fixed line phones have internal electronics and a battery to power them.

Hope this answers your question.  

Electronics

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ZZ

Expertise

Electronics questions about AC, DC and digital theory.

Experience

Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

Organizations
IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

Education/Credentials
BSEE University of North Dakota

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