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Discussion in 'Electronic Repair' started by klem kedidelhopper, Oct 1, 2012.

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  1. I have to install an Internet connection at a location somewhat
    removed from the origination point. The building is very large, spread
    out, and difficult to run wire through. Presently there already is a
    connection terminated in an Rj45 at a point that is only used for one
    week out of every year. All other times there is nothing plugged into
    this jack but the connection remains active. In order to make the
    connection to the new location about 100 feet away can I tap off the
    existing jack and "daisy chain" the wire to the new location and then
    terminate that wire in a second R45? I now this is not common practice
    but if only one computer is using the line at any particular time
    would this work? There will never be a time that two computers will
    ever be operating on this line at the same time although for that week
    in question they both may be plugged into it though. would this be an
    issue? I can arrange to have the new location unplugged during this
    time if need be. Thanks for any advice. Lenny
  2. mike

    mike Guest

    yes, but only one can be plugged in and it will be a nightmare
    for the next guy who tries to figger out why it doesn't work like it
    should. Put a plug on the extension wire so you can have only one

    Stick an ethernet switch at the location and you can have as many
    plugged in as you have ports on the switch.
    They're $10 on ebay, free at garage sales.
    If you walk outside in a populated area and yell, "I need an
    ethernet swtich," people will come out of the woodwork glad to
    get rid of them.
    You only have to have the switch powered for a week.

    I now this is not common practice
  3. Guest

    I really like the idea of a plug on the extension wire. The existing jack is on a wall in a public building in a single gang lock box fed through 1/2 inch EMT. I can figure a way to arrange this so that the extension runs through another length of pipe into the same box and is then plugged into the existing jack and the box locked for the 51 weeks of the year that it isn'tused. That way the remote location will be live for those 51 weeks. When they need to use the present location for that one week, they'll simply unlock the box, unplug the extension wire, (similar to what you do to test a COline at a telephone interface Demarc point), thereby freeing up the line downstream. They can then connect their equipment without an issue. Great idea, Thanks, Lenny
  4. Ethernet switches can also be found on the back of (unwanted) DSL modems
    found on the shelves of second hand stores. Just put some black tape
    over the blinking "DSL Fail" LED and you've got yourself an inexpensive
    ethernet switch. Many DSL Modems come with 4-way switches. I did that
    with an ActionTec DSL Modem for a few years, before I found a 10/100
    5-Port LinkSys for $5 on a shelf at a second hand store.

  5. Guest

    Thanks for all the great ideas guys. I really appreciate them. Lenny
  6. Guest

    "No DSL modem comes with more than one ethernet port. "

    Your posts indicate intelligence, are logical and all that, but this one time you erred. Claimed a negative. You know better.

    Two 2WIRE modems I know (and actually did the setup) have four RJ45s as well as four channel 802.11. (g I think)

    Of course you could argue that these are routers or whatever, but really fastforwarding through the argument which would be fruitless anyway, how different is it ? Isn't the DSL MODEM just a router or switch that connects to a "slightly" bigger network ?

    Two ways of thinking about it but I think neither is wrong.

  7. josephkk

    josephkk Guest

    The real issue is line length to the next device. 100 meters or 320 feet
    depending typical local units. Beyond that function is NOT guaranteed by
    the standards. Non-compliant cables, connectors or other connections may
    interfere with reliable as well.

  8. josephkk

    josephkk Guest

    I mostly agree with your distinction on the difference between modem and
    I do not think that what is appearing at the DSL end user terminals is ATM
    but closer to VT45 or VT135 with highly compressed data. Moreover you are
    looking at data likely being a shared service with a much more broadband
    (TV) type service on the same pair.

  9. josephkk

    josephkk Guest

    VT45 is the payload portion of an STS-1 (about equal to a DS-3), likewise
    VT135 is the payload portion of an STS-3.
    Thanks for the link. It ties up a lot of loose ends for me. But the
    signal coming down the wire to my modem-router does not seem to include
    the ATM overhead.

  10. Guest

    "Give me a 2wire model number and my guess(tm) is that it will be
    a router inside. All (and I do mean all) 2wire devices that have
    built in wireless also have a router inside. Marketing may call is a
    "modem", but if it has a router inside, it's really a "DSL router". "

    It's a 2WIRE RG2701HG-00. One link calls it a modem and switch, another a modem switch/router and another a modem/router.

    Talk about definitions.

    In the old days I got the gist of electronics, and I mean to where I could do a little bitt of designing. That was all analog. Even then some of the definitions were not memorized by me, like even though I know the names Colpitts and Hartley I couldn't tell you the (dis)advantages of either right now. I can look it up of course but I really only committ(ed) to memory what I need(ed).

    I see no difference between a switch and a router, but of course there is.

    What I see is that a router can have a hardware firewall, but I've never seen it on a switch. I may need to know these things soon if I go to get the network at work running again.

    I know where to come.

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