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From: woody@ucscb.UCSC.EDU (Bill Woodcock)
Newsgroups: comp.dcom.lans
Subject: Re: another 10BaseT wiring question
Message-ID: <14214@darkstar.ucsc.edu>
Date: 7 Apr 91 03:58:45 GMT
References: <9736@mentor.cc.purdue.edu> <1991Apr6.151024.7638@netcom.COM> <9770@mentor.cc.purdue.edu>
Sender: usenet@darkstar.ucsc.edu
Organization: University of California, Santa Cruz
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        > lairdkb@mentor.cc.purdue.edu (Kyler Laird) writes:
        > I'm looking for something like a harmonica adapter
        > that would allow me to plug in 12 RJ-45 connectors
        > and come out with a 50-pin telco connector.
          
        > jbreeden@netcom.COM (John Breeden) writes: 
        > Contact any of the large telco distributers (like
        > Graybar), or AT&T Network Systems - what you're
        > looking for is pretty common in the world of phones.
         
        > lairdkb@mentor.cc.purdue.edu (Kyler Laird) writes:
        > Hmm...I suspected this, but am wary.  The problem I
        > assume I'll encounter is a person who keeps saying
        > "Sure, 6 RJ-45 (8 conductor) to a 50-pin telco.  No
        > problem."  I have already found a harmonica adapter
        > with RJ-45's in and a 50-pin out.  The problem I'm
        > having is that RJ-45 is 8 conductor and 10BaseT is
        > only 4 conductor but it uses RJ-45 connectors (more
        > on that in another ongoin thread...).  So the
        > adapters I've found so far (Inmac...) have only 6
        > (6*8=48) RJ-45's in.
    
    At first glance I agreed with John Breeden.    I've  used  the  little
    8-pin harmonica  blocks many times, but I see your problem.  If memory
    serves, they're AT&T part number something-something 256,  and  always
    referred to  by their number.  They do indeed pass all eight pins, and
    wouldn't work for you to plug directly in.  Outfits like  Graybar  and
    Anixter  Brothers  might carry a part that does exactly what you want,
    but don't bet on it.   Phone  numbers  for  the  South  San  Francisco
    branches  are as follows, and they can give you numbers for your local
    branch:
    
        Anixter Bros.:  +1 415 352 3100
        GrayBar:        +1 415 871 7000
    
    What you might want to look into, though, is patch panels and  12-jack
    harmonica blocks  from  vendors  of  10BASE-T hubs.  I know for a fact
    that Farallon (+1 415 596 9100) makes at least one model of each,  and
    I  would  assume  that  their  competitors  (NeuvoTech, etc.) would be
    selling similar products.
                             
                            -Bill Woodcock
                             BMUG NetAdmin

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