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RJ-45 Breakout Box?

Discussion in 'Electronic Components' started by Tim Wescott, Jan 10, 2005.

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  1. Tim Wescott

    Tim Wescott Guest

    I've seen serial breakouts, with DB-9 connectors. Does anybody make a
    breakout box with modular connectors? I'm about to make my own, but
    it'd be nice to know.

  2. Dmitri

    Dmitri Guest

    Tim Wescott wrote:

    There is no standard pinout for RS232 on 8P8C connectors, so it is
    unlikely someone will produce such box. You can still get (proprietary)
    adapters for the DB-9 or DB-25 to 8P8C, which, combines with a "regular"
    breakout box, will get you what you are looking for. Check Internet for
    AT&T 355 adapter or equivalents. Or simply get a customizable adapter and
    invent your own pinout. Just make sure it's the same (or cross-over if you
    need it) on both ends.

    Dmitri Abaimov, RCDD
    Cabling Forum, color codes, pinouts and other useful resources for
    premises cabling users and pros
    Residential Cabling Guide

    Article posted with Newsgroup Archive
    no-spam read and post WWW interface to your favorite newsgroup -,sci.electronics.components - messages and counting!
  3. Not a 'breakout' box as such, but quite a few people do DB9 plug housings
    with a RJ45 socket, and the pins left loose, so you just plug the wires
    into the required pins on the DB9, and screw the cover on. In the UK, from
    RS electronics, they are part number 382-2689, and you can look at these
    on their web page.

    Best Wishes
  4. Tim Wescott

    Tim Wescott Guest

    I seem to not have been clear.

    I'm working on a telephony application, and I want to dink with tip and
    ring. I want a break out box that's just like serial break out boxes,
    only it uses modular connectors -- AKA "telephone" connectors, AKA RJ-45.

    Thanks again.
  5. Dave Platt

    Dave Platt Guest

    There is no standard pinout for RS232 on 8P8C connectors, so it is
    unlikely someone will produce such box.[/QUOTE]

    Well, it appears that there are actually _two_ fairly popular
    standards. EIA/TIA 561 is one, and the ""Yost Serial Device Wiring
    Standard" is often found on Unix systems. The two are, alas, quite

    One advantage of the Yost standard is that it presents the same
    data-in and data-out positions on the RJ45 for all devices... the
    differences between DCE and DTE are taken care of in the DB-whatever-to-
    RJ45 connector. With Yost, you can connect any device to any other
    with the same cable.

    I agree, the O.P. will very probably have to build a breakout box with
    whatever RJ45 pinout is desired.
  6. You didn't say how many pins the modular connector might have. If you
    know someone who does a lot of Cisco equipment, they may have a 9-pin to
    modular RJ-45 adapters laying around. Whether or not it has the pinout
    you want is another matter, because there's no real standard for the
  7. Rich Grise

    Rich Grise Guest

    By the time you're done with the thread, you could have build one already. :)

    Just a couple of PCB-mount connectors, and a piece of stripboard, maybe a
    couple rows of pin headers or turret terminal TPs. Or even a DIP socket. ;-)

    Have Fun!
  8. Tim Wescott

    Tim Wescott Guest

    Or even some clip leads and some sockets from Rat Shack (which is what I
  9. No, no, no! Real Telephone Techs don't use pin headers, etc. Real
    Telephone Techs use a 66 block to do their 'patching'. That and a hank
    of telephone wire is all any real telephone tech ever needed. You can
    get a 66 block with RJ-45 connectors on the side. But the RJ-45 is not
    a telephone connector, it's for T1 or modems or ISDN. You only need two
    wires for tip and ring, not eight wires! What you really need is a 6
    position, 2, 4, or 6 conductor jack and plug, commonly known as RJ-11 or
    RJ-14 or RJ-25.
  10. Ah-HAH! You made a 'Beige Box!" (Look up Phreaking for more info.)
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