RJ48x vs RJ31x

[swfl]

Can a RJ31X be used in place of an RJ48X? Is it just different pins that are shorted out?

 

[TouchToneTommy]

No, the 31 shorts from pin 4 to pin 1, and pin 5 to pin 8

http://www.cabling-design.com/images/rj31x.gif

The 48 shorts from pin 4 to pin 1, and pin 5 to pin 2

http://www.blackbox.co.uk/technical/images/nutsnbolts/USOC_fig05.gif

 

[SYQUEST]

That depends on the particular Modular Jack hardware. Remember the RJxx spells out a particular wiring arrangement for the type of service needed on the Modular Jack. Not all Modular Jacks are the same, for example: 6-position or 8-position with/without shorting bars. The are different mounting arrangements also.

You can download a reference guide from Suttle Apparatus here:

http://www.suttleonline.com/support/resources/usoc-guide.php

Try this link, I think you might find this useful.

....JIM....

 

[dagwoodsystems]

Though "X" doesn't always indicate a shorting bar AND while both RJ31X and RJ48X call for an 8P8C, the wiring arrangement or pinout is what kills the ability to swap them as like jacks.

Tim Alberstein

http://www.dagwoodsystems.com

 

[cwc3]

pry the shorting bars off they are identical we used to do that to stop old pbx stuff from bypassing dialers!

 

[LkEErie]

You could make your own loopback plug and just use an 8p8c jack without shorting bars, but that's not much fun. We just get RJ48X's from Graybar (Allen Tel p/n AT635CX) They're not very expensive.

http://www.allentel.com/pdf/technical.pdf

LkEErie