Network ON/OFF Switch with Timer

Hello there, I am a network administrator and trying to create a simple device to test the alarms on our systems. Since I am not an electrician of any sort, I have an idea of what I need, but no idea of parts or names to order. Basically, I need to have a basic on/off switch with button that I can wire to a CAT5 cable. Simple enough, stops traffic at the push of a button but thats the obvious part. I also need to have some control over how long my connection times out, and after some research, I think a timer relay does that, but I can't be sure. It just needs to turn the activity back on after it goes off say between 1 second and 10 seconds off, the connection turns back on. If I can accomplish that, than I would also like to add a dimmer type device such as that of a light switch dimmer, but smaller and working with less voltage. So... Can this be done with all 3 electric devices? The closest thing I found in searching was some generic Lag Switch, but it did give me a starting idea of how to design it. I drew a simple draft of what I had in mind. Any help by some electric gooroo's would be most appreciated. Thanks! Jonathan

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Can we assume that you know why UTP is T? Pat. Pending
hannibalxlecter (author)  Patrick Pending10 years ago
Who's the question geared at? UTP is twisted to reduce interference or "cross talk". But what does that have to do with this posting?
Your suggested circuit isn't twisted. Consequently, noise could create a fault condition even when it wasn't operating. Pat. Pending
hannibalxlecter (author)  Patrick Pending10 years ago
The actual connection will only remove a single wire from the Cat5 cable for likely an inch or less. It's highly unlikely that there would be any cross talk as specially considering that the separated line will have no contact with the other 7 wires. But good observation none the less.
I was referring to external noise not cross-talk. If your test circuit creates noise itself or allows external noise onto the cable it is likely to cause problems. Although your tests may include one for noise, it needs to be quantifiable not arbitrary. My advice would be to contact a network installation company and ask them to design suitable tests or alternatively buy an off-the-shelf stress tester. Pat. Pending
hannibalxlecter (author)  Patrick Pending10 years ago
But now where would be the learning and fun in that? Heh, I agree though, if I run into issues with the testing device, that's likely the choices I'll be left with. But, hopefully I'll be able to coin a new easy to build testing device and share with the online community.
Have you looked in to using software based load-testers as part of your testing process? There are a number of freeware applications knocking about. Pat. Pending
NachoMahma10 years ago
. Assuming that breaking just the orange wire will kill the connection (I dunno), all you need is a momentary-contact, single-pole-double-throw (SPDT) switch. Wire it to the NC contacts. To get timer functions, I'd find a 555 timer circuit that has a relay output. You can find timer circuits as complicated or as simple as you need. Searching for 555 +relay should find what you want.
. For the dimmer, a potentiometer should work. No idea what R and W specs would be.
hannibalxlecter (author)  NachoMahma10 years ago
Hey Nacho, on the 555 timer, studying a few of the sites its listed on, (very few), it looks like it simply sends a pulse of electricity at timed intervals. Could you dip in a little more in detail on how it may help.

Again, I just need to create an on/off type switching that throws my orange wire back into play after a set number of seconds.

Here is one site I found with a little info
. Been too long since I did any of this to be of much help with the details. :( IIRC, you want to use the output of the 555 to turn a transistor on/off. The xistor drives the relay.
. The sw at Maplin's is exactly what I was talking about.
. I think Pat Pending is making a very good point - ie, a professional job calls for professional tools. What we have been discussing would be OK (but still not great) for a home or non-critical business application, but it won't provide what you need for a "real" network.
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