🚀 go-pugleaf

In article <1992Nov4.191447.16186@krfiny.uucp> jeffj@krfiny.uucp 
(J. Jonas) writes:
>In article <1992Nov3.234141.6903@kodak.kodak.com> ornitz@kodak.kodak.com
>	(Barry Ornitz) writes:
>>There are modules made by companies like Cermetek that SIMPLIFY getting Part
>>68 certification but they do NOT eliminate the process.  Face the fact that
>>anything connected to the telephone lines directly must be certified.
>
>Huh?  I read in the Cermetek DAA data sheets that the FCC part 68
>certification was transferrable to whatever equipment used
>the DAA for the phone interface.

I decided to check the latest data sheets from Cermetek in our VSMF microfilm
library.  It seems Jeff and I are both right.

Cermetek makes a few DAA modules (Data Access Arrangements) that carry Part 68
pre-approvals that convey FCC Part 68 approvals to the devices they are used
in.  Cermetek suggests the use of these DAA's to minimize registration delays
and get your product to market quickly.  These particular DAA's are expensive,
however, and they suggest that they be replaced by other units they manufacture
in your final FCC tested and approved design.  These other units conform to
the FCC Part 68 standards but still require registration.

From: cgordon@vpnet.chi.il.us (gordon hlavenka)

+++Try Cermetek at +1-408-752-5000.  I've used a device called the CH1812
+++which provides part 68 certification.  It also includes the hybrid,
+++incoming ring detect, and offhook circuitry -- these features are a
+++side-effect of the certification requirements.  The module actually
+++comes with a sticker you attach to the outside of your finished
+++product.

According the the microfilm literature (which might be out of date), the 
CH1812A does not provide pre-approval.  This is sad since this is the model
that has shown up at hamfests for well less than $1.  The Ch1810, CH1811, and 
CH1832 are the models that are pre-registered.  The Ch1812A, 13, 15, 16, and 18
are subsets that CONFORM to FCC Part 68 - but still require registration.

I broke open the potting on a CH1812A and found that it was rather complex
inside.  I doubt if any single chip solution can provide the performance,
surge protection, and isolation that these modules can provide.  It is too
bad that they cost far more than most inexpensive modems in small quantities.

					Barry
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|  ___  ________  |       Dr. Barry L. Ornitz          WA4VZQ
| |  / /        | |       Eastman Kodak Company
| | / /         | |       Eastman Chemical Company Research Laboratories
| |< < K O D A K| |       Process Instrumentation Research Laboratory
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| |__\ \________| |       Kingsport, TN  37662       615/229-4904
|                 |       INTERNET:   ornitz@kodak.com
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