RJ-48 is similar to RJ-45 except that it has a key on the side of the jack.
A RJ-45 plug would fit a RJ-48 jack but a RJ-48 plug would not fit a RJ-45
jack. See the following for a physical view of a keyed plug.
http://catalog.tycoelectronics.com/AMP/docs/pdf/6/39/195936.pdf
Just checked out an Atran CSU/DSU. Its Network (T-1) jack is referred to as
an (USOC)RJ-48C. AMP#555164-2. It is keyed.
Having said that, I seem to remember a similar discussion some while back
where it was said that the RJ specs referred to usage rather than physical
characteristics.
> -----Original Message-----
> From: Howard C. Berkowitz [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, January 13, 2001 6:21 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Physical Difference Between RJ45 and RJ48
>
>
> >"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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