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'modems & approval'
1996\06\03@095006 by Harrison Cooper

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Kalle had an valid comment on approval to hook things to the
phone lines.  I'm not 100% sure on this, but it seems to me
that if you build something yourself (such as CID) for yourself
and as long as you follow good engineering and construction
practices, you don't have a problem tying it to the phone line
(unless telco comes a knockin').  If you want a production item,
then approval is necessary.  Perhaps Andrew Warren can verify this
(I picked on him, because he seems to know quite a bit about alot
of things).  However, you can buy a pre-qualified module with the
telco interface.  Is it CerTek that has these things ?  They are
out there, somewhere around $20 or so.  Not sure about the name.

1996\06\03@103024 by Wireless Scientific

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At 7:50 AM 6/3/96, Harrison Cooper wrote:
>Kalle had an valid comment on approval to hook things to the
>phone lines.  I'm not 100% sure on this, but it seems to me
>that if you build something yourself (such as CID) for yourself
>and as long as you follow good engineering and construction
>practices, you don't have a problem tying it to the phone line
>(unless telco comes a knockin').  If you want a production item,
>then approval is necessary.  Perhaps Andrew Warren can verify this
>(I picked on him, because he seems to know quite a bit about alot
>of things).  However, you can buy a pre-qualified module with the
>telco interface.  Is it CerTek that has these things ?  They are
>out there, somewhere around $20 or so.  Not sure about the name.


Harrison,

DAA and other modem goodies are available from Cermetek at

http://www.isi.net/ebs/cermetek/index.html

That's certainly a place for me to start.

Thanks,
craig

1996\06\03@105438 by David Knell

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In this small island off the coast of Europe, your're supposed
to get BABT approval for your device *before* connecting it to
the phone line.  This rule is, needless to say, widely ignored.

{Quote hidden}

------------------------------------------------------------
David Knell
Tel: 01843 846558
Fax: 01843 846608
E-mail: spam_OUTdaveTakeThisOuTspamdave-ltd.co.uk

1996\06\03@131212 by fastfwd

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Harrison Cooper <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU> wrote:

> Kalle had an valid comment on approval to hook things to the
> phone lines.  I'm not 100% sure on this, but it seems to me
> that if you build something yourself (such as CID) for yourself and
> as long as you follow good engineering and construction practices,
> you don't have a problem tying it to the phone line (unless telco
> comes a knockin').  If you want a production item, then approval is
> necessary.  Perhaps Andrew Warren can verify this

Consider it verified.  Yes, you need FCC approval (in the States...
PTT in Europe, etc.) before you can sell any device that connects to
the phone line.  All they're really interested in is safety, so if
your device is isolated from the line via opto-isolators or
transformers, you'll get the approval.

-Andy

Andrew Warren - fastfwdspamKILLspamix.netcom.com
Fast Forward Engineering, Vista, California
http://www.geocities.com/SiliconValley/2499

1996\06\03@143948 by Eric Smith

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Harrison Cooper <.....hcooperKILLspamspam.....ES.COM> writes:

> However, you can buy a pre-qualified module with the
> telco interface.  Is it CerTek that has these things ?  They are
> out there, somewhere around $20 or so.  Not sure about the name.

I think you mean Cermetek.  They make two kinds of DAAs (Direct Access
Arrangements, which Cermetek calls DCPH, Direct Connect Protective Hybrid):

1:  Basic DAA, requires some care to make sure it meets all relevant part 68
   specs (things like billing delay timer, typically implemented in software).
   Relatively inexpensive, but doesn't come with transferrable part 68
   certification.  This is useful if you don't want to design the phone line
   interface yourself, but to use it in production you will still have to get
   your product certified.  Since certification is the expensive part, IMHO
   you might as well design your own and save some money.

2:  Fully-compliant DAA with transferrable certification.  Really expensive,
   but it does everything.

Of course, if you're outside the US, all bets are off.

I have a pile of Cermetek CH 1810s, which I think are the first kind.
Condition unknown, but believed working.  No data, although a sheet should be
available from Cermetek (try directory assistance for area code 408).

Any offers?

Eric

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