>"Ken" <[EMAIL PROTECTED]> discoevered,
>I may be on to my own answer. I will add the information here in case it
>comes up again. I have discovered that RJ connectors are actually defined in
>the Code of Federal Regulations, which seems an odd place to me.
>Specifically at Title 47 Chapter 1 Part 68, which is available online at
>http://www.access.gpo.gov/nara/cfr/waisidx_00/47cfr68_00.html
Frightening that I haven't thought about this for 25 years or so, but
a bit of history may shed light on why you found these in an odd
place.
RJ stands for Registered Jack. It appears in US regulatory literature
as a consequence of the 1975 AT&T breakup and other actions such as
the Carterfone Decision. Prior to these, since The Phone Company
owned everything, there was no need for a third-party vendor or for
modularized customer interfaces. With divestiture, however, the
demarcation of responsibility between carrier and customer, or for
third-party equipment to carrier, was needed.
While the RJ series had quite reasonable applications simply for
wiring, legal pressures made them ubiquitous in the US.
>
>The relevant information appears to be in 68.500 and 68.502. I will be
>reading these. If anyone has any other information, please let me know.
>
>""Ken"" <[EMAIL PROTECTED]> wrote in message
>93ouel$gnm$[EMAIL PROTECTED]">news:93ouel$gnm$[EMAIL PROTECTED]...
>> I found one thread in the archives on this general subject, but it did not
>> entirely answer what I need to know. I need to know what the difference is
>> between a RJ-45 and RJ-48 connectors. In particular are there physical
>> dimension differences in the two. I have seen both used to connect a T1
>> demarc to a CSU/DSU. But I have been told that the RJ-48 is slightly
>> different than the RJ-45. As such the electrical contacts may not reliably
>> match up and cause unexpected connection problems. So is there an actual
> > physical difference in the two? If so, exactly what?
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