--- David VanHorn <dvanhorn@CEDAR.NET> wrote:
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Thanks for replying.
>
> >At least I do know now that I've wire-wrapped my
> >project in a "good" way. There's no noise. The dial
> >tone, busy tone, and speech are audible and smooth.
> >(I've got some small problems, anyway--- like I
> can't
> >balance accurately the speech network).
>
> Did you include the proper reactance as well as
> resistance in your
> balancing impedance?

Actually, I don't know what components should be used
because in the first place, I don't know the impedance
of the telephone line. And I do not know how to
measure the impedance of the line. The datasheet of
the subscriber line interface circuit (slic) i'm using
suggested some combinations of components to arrive at
specific transmit and receive gain. I'm assuming the
impedance of my telephone line is 600 ohms but I'm
sure this depends on the length of the line. Anyway,
the SLIC incorportes the speech network and you can
program the network balance impedance by choosing the
appropriate components. tahe SLIC I'm using is
MH88617AT from Mitel Semiconductor.

I need your help. Do I continue using the components
for 600 ohms and just vary the length of the wire? Or
is it better to use a fix length of wire and use
trial-and-error to arrive at at the correct value of
the balancing network?

Maybe this is the reason why when I dial, only the
number "0" (operator) is being detected.

Anyway, the voice coming to my circuit is loud but the
otgoing voice can't be heard at the other line.
Sometimes, the reverse happens.


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=====
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
Jane Ifurung
UP Diliman, Quezon City
920-5301 loc 5854
(632)731-3545
jifurung@eee.upd.edu.ph
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~

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