Looking for dead Omnicom FS2828

["Pete Shew" <ukha_d@xxxxxxxxxxxxxxxxxx>]

My FS2828 finally locked up solidly after sporadic failures that could only
be recovered by severe power cycling :-( So I thought about my PBX feature
wish list and set about hooking a PIC16F877 to the remains, and am starting
to write myself a PBX.

What would be useful is another FS2828 as an easy option to some more
extensions, plus as a spare for some of the trickier items e.g. the power
transformer. Since a lot of these were made, there must be a steady trickle
of them going to the skip, so if anyone knows of one, I would be grateful.

If anyone else is nursing one of these, I now know quite a lot, though not
all, about the circuitry, and am happy to share.

Pete

*********** REPLY SEPARATOR  ***********

On 02/07/2004 at 09:42 ant wrote:

>On Thu, 01 Jul 2004 16:42:59 +0100, Pete Shew <ukha_d@xxxxxxx>
>wrote:
>>
>> The meaning of the term "bandwidth" seems to have
undergone a shift.
>> I think bandwidth started as a radio communications term where the
width
>of the radio band, that is the spread of used frequencies, is related
to
>the capacity to send information.
>
>Yes, bandwidth is formally the range of frequencies which can be
>conveyed by a channel. For a channel of bandwidth B, the maximum rate
>at which the signal may change is 2B, governed by the Nyquist-Shannon
>law. This is sometimes called the maximum information rate.
>
>The theoretical rate at which information passes error-three through a
>bandwidth-constrained limited-power channel in the presence of
>Gaussian noise is called the Channel Capacity, and is found from the
>Hartley-Shannon Law C=B log2 (1 + (S/N)) bits/second.  (S/N is the
>signal to noise ratio).
>
>This is a theoretical maximum; real channels do not achieve this. The
>maximum 'signal rate', 'bit rate', 'information rate' or whatever you
>want to call it is lower than the channel capacity by a factor called
>the channel bit error rate (BER).
>
>So, as you say, the terms "bandwidth" and
"capacity" are mis-used by
>telcos ;)
>
>ant
>
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>
>Yahoo! Groups Links
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