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'Telephone - Interface'
1995\05\18@115123 by Doug Sellner

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I'm developing a consumer product that needs to sense the status of the
phone line, I.E. determine - ring, offhook, onhook.

Anyone have a low cost solution?

Doug Sellner
Beach Tech
4131 Vincent Avenue South
Minneapolis MN 55410

Voice (612) 924-9193 x 521
Fax   (612) 926-1145

Internet: spam_OUTdsellnerTakeThisOuTspamembay.com

1995\05\18@155209 by John M Johnson

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Yea simple.  put a bridge rect on the tip and ring lines.  Look up hte
stats on a telephone.  I beleive a ring is a 42V AC single and as for the
other when you pick up there is a DC current flow.  Just check for that.
Shouldnt be too hard to do with analog logic (not that i would ever try
w/o exploiting every possiblity for a digital solution first :)  AT&T
makes a nifty little plug that will cut off and answering machine when
the tele picks up.  Its not much bigger if at all then an splitter.  Go
buy one and bust the thing open.  reverse engineer it(dont tell
microsoft) and then you have your current checking bit...


later
       John
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John Johnson  Team OS/2 member     |Windows NT.  VMS with a GUI!
.....johnsonjKILLspamspam@spam@ccwf.cc.utexas.edu        |.386:windows synonym for "gadget"
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.....johnsonjKILLspamspam.....computek.net              |Windows 4.0 -> Windows 95 -> WinEver
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1995\05\18@161322 by Jerry Ethridge

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>
> I'm developing a consumer product that needs to sense the status of the
> phone line, I.E. determine - ring, offhook, onhook.
>
> Anyone have a low cost solution?
>

Do you plan to get it FCC part-68 certified and do you know how
much that certification cost? I am also planning to build a device
to interface to the phone lines and was wondering about all the
legalities in doing so. If anyone knows any specifics about the
requirements, we would like to know.

Thanks,
Jerry

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Jerry Ethridge                  Richardson, Tx.              |
ERICSSON Inc.                                               /O\
EraseMEexujetspam_OUTspamTakeThisOuTexu.ericsson.se                            \_______[|(.)|]_______/
                                                   o   ++   O   ++   o
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