Very Computer

by **Brad Ackerma** » Fri, 17 Jun 1994 02:41:59

Will an RJ-11 jack fit in an RJ-45 socket? (The socket in question is
using POTS for now.)

--
===========================================================================
Brad Ackerman N1MNB

Not an M$ user, and proud of it! Finger this acct -->

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by **Carl Oppeda** » Sat, 18 Jun 1994 01:05:03

Quote:>Will an RJ-11 jack fit in an RJ-45 socket? (The socket in question is
>using POTS for now.)

An RJ-11 plug will fit, but sloppily, into an RJ-45 jack. I don't know
if that is your question, however.

--
Carl Oppedahl AA2KW
Oppedahl & Larson (patent lawyers)
Yorktown Heights, NY
voice +1-212-777-1330

by **pum** » Sat, 18 Jun 1994 03:18:30

Quote:
>Will an RJ-11 jack fit in an RJ-45 socket? (The socket in question is
>using POTS for now.)

Yes - but..
- It may be a bit hard to get in and out, shorter latch, a bit of
wobble - but once it clicks in place it should be ok.
- On some jacks it may depress the pins 1 & 8 down pretty far,
since there aren't slots in the plug for them, and they may not
recover well - so - if you later use this jack for a REAL RJ-45
application, you might have some poor connections on those pins.

Possibly a better solution would be to make cables with RJ-45 on
one end and RJ-11 on the other, using 4 (or 6) conductor cable.

--

by **Theodric You** » Sat, 18 Jun 1994 18:46:09

>Will an RJ-11 jack fit in an RJ-45 socket?

Hmmm... (unplugging my phone) .... >click< ....
(plug the RJ-11 into a RJ-45 jack sitting on my desk) ... <snap> ...

Huh... It seems to fit in quite nicely... Hang on...
(grabs his multimeter) >beep< >beep< >beep< >beeeeep< ...

All the connections seem to be good, even when I wiggle things around.

Later Days,

-Ted Young

by **Bill Hugh** » Wed, 22 Jun 1994 01:18:02

> >Will an RJ-11 jack fit in an RJ-45 socket?

> Hmmm... (unplugging my phone) .... >click< ....
> (plug the RJ-11 into a RJ-45 jack sitting on my desk) ... <snap> ...

> Huh... It seems to fit in quite nicely... Hang on...
> (grabs his multimeter) >beep< >beep< >beep< >beeeeep< ...

> All the connections seem to be good, even when I wiggle things around.

> Later Days,

> -Ted Young

Yes, RJ11 jacks will sloppily fit in an RJ45. They were designed that way.
BUT......
When you plug an RJ11 into the RJ45, the plastic part of the jack has thick
edges on the outside of the jack that push up on pins 2 & 7 of the RJ45
receptacle. In some manufacturers receptacles, this will cause those pins
to be bent up and stay there. This has the potential for preventing good
connections on these pins when you subsequently plug in an TJ45 jack.
Typically the outside pins 1&2 and 7&8 are used for two pair data
connections such as 10BASET ethernet.
SO.....
You can insert an RJ11 into an RJ45, but it should be a no-no.

by **Tony Pellicc** » Wed, 22 Jun 1994 21:40:18

> Yes, RJ11 jacks will sloppily fit in an RJ45. They were designed that way.
> BUT......
> When you plug an RJ11 into the RJ45, the plastic part of the jack has thick
> edges on the outside of the jack that push up on pins 2 & 7 of the RJ45
> receptacle. In some manufacturers receptacles, this will cause those pins
> to be bent up and stay there. This has the potential for preventing good
> connections on these pins when you subsequently plug in an TJ45 jack.
> Typically the outside pins 1&2 and 7&8 are used for two pair data
> connections such as 10BASET ethernet.
> SO.....
> You can insert an RJ11 into an RJ45, but it should be a no-no.

My favorite was a frantic call that someone's async and network connections
wouldn't work. Now imagine.. the async connection uses an RJ11 and the net
an RJ45. I can understand how they fit the RJ11 into the RJ45 but this
person also managed to squeeze an RJ45 into an RJ11 jack. I had the devil
of a time getting the thing out. Hence, a request was made. Before you move
your office around call computing services.

I've also had numerous instances of people plugging async (RS232) lines
into phone jacks.

--
== Tony Pelliccio, KD1NR

== The opinions above are my own and not those of my employer.

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