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Message |
none
Guest
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 Posted:
Thu Dec 08, 2005 8:18 am Post subject:
ethernet problem |
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I'm trying to create an in-series circuit board with status LED's
indicating data being transmitted. this would be used to hook into
different segments to find out where damaged cable would be. I was
thinking of using a PNP transistor with a 5V source to the collector,
line from the particular line it's picking up on to the base and emitter
going to the LED. My problem is i can't detect any voltage or amps
comming through the line even though it is active.
in the Cat5e cable there are 4 twisted pairs: Orange, Green, Blue,
Brown. I want to hook each into a LED to determine any activity on that
pair. Why do i not detect any amp's or voltage comming trhough the line?
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artie
Guest
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| Posted:
Thu Dec 08, 2005 9:35 am Post subject:
Re: ethernet problem |
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In article <kKMlf.26498$Au1.3720@tornado.texas.rr.com>, none
<none@none.com> wrote:
| Quote: | I'm trying to create an in-series circuit board with status LED's
indicating data being transmitted. this would be used to hook into
different segments to find out where damaged cable would be. I was
thinking of using a PNP transistor with a 5V source to the collector,
line from the particular line it's picking up on to the base and emitter
going to the LED. My problem is i can't detect any voltage or amps
comming through the line even though it is active.
in the Cat5e cable there are 4 twisted pairs: Orange, Green, Blue,
Brown. I want to hook each into a LED to determine any activity on that
pair. Why do i not detect any amp's or voltage comming trhough the line?
|
Differential signals. pins 1(+) and 2(-) going one way, 3(+) and 6(-)
going the other. Other pins usually connected in a "bob smith"
termination.
google 100 base tx chips and look at interface specs.
And with fast ethernet, these are fast signals.
--
Namaste-- |
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Mac
Guest
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| Posted:
Fri Dec 09, 2005 9:35 am Post subject:
Re: ethernet problem |
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On Thu, 08 Dec 2005 02:18:56 +0000, none wrote:
| Quote: | I'm trying to create an in-series circuit board with status LED's
indicating data being transmitted. this would be used to hook into
different segments to find out where damaged cable would be. I was
thinking of using a PNP transistor with a 5V source to the collector,
line from the particular line it's picking up on to the base and emitter
going to the LED. My problem is i can't detect any voltage or amps
comming through the line even though it is active.
in the Cat5e cable there are 4 twisted pairs: Orange, Green, Blue,
Brown. I want to hook each into a LED to determine any activity on that
pair. Why do i not detect any amp's or voltage comming trhough the line?
|
This won't work. Just forget it.
--Mac
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