Re: how I can connect 89c51serial port to telephone lineto send data?
- From: Don Bowey <dbowey@xxxxxxxxxxx>
- Date: Sun, 27 May 2007 13:19:37 -0700
On 5/27/07 12:29 PM, in article
b6ydnXb7pZKnQcTbnZ2dnUVZWhednZ2d@xxxxxxxxxxxx, "Bob"
<nimby_NEEDSPAM@xxxxxxxxxxxxxx> wrote:
"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_@xxxxxxxxxxx> wrote in message
news:Tqj6i.1793$As5.1477@xxxxxxxxxxxxxxx
st_yar@xxxxxxxxx wrote:
dear all,you need a one to one audio transformer to isolate the
I try to send vedio from cctv via telephone line I connect the cctv
camera output to ADC and the output of the ADC to Atmel 89c51
micocontroller to send the data serial but I want to connect the
output of the atmel89c51 to the telephone line
please help?
what the next step
best regards
yar
DC voltage .
A good pair of clamping diodes to protect the processor
from the ring voltage.
P.S.
Don't expect to send square wave signals directly. you'll have
to device a method of using sine wave audio.
this can be done via good voltage comparator on the RX end to
decode it.
Sheesh! The silly gets ridiculous.
If sending baseband data over a phone line were this easy then the modem
would never have been invented.
The maximum bitrate a plain old telephone line will pass, through the public
switched network, is about 50kbps. Can you limit your video signal to this
type of bitrate? No, right?
Your only chance is to store up a bunch of video and then send it
s-l-o-w-l-y over the phone line (in non- real time) by using a modem. If you
can send the digitally-encoded video over a DSL or cable modem then you'll
be able to send it in real time. Otherwise fahgettaboudit.
Bob
You are correct if the intended connection is a dial-up.
However, the OP has not stated whether it is, or whether it is a
point-to-point connection, perhaps on non-loaded cable.
How about it OP? What are you trying to do?
Don
.
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