RJ-11 standardization

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 Question by Keith Mortensen posted 04 May 2005
 RJ-11 standardization
I'm trying to connect an RJ-11 plug into an RJ45 jack to test modems. I've noticed that some of the RJ-11's being used seem to connect very well, yet others are difficult to connect.

Upon further visual inspection, I noticed that the 'ribs' between contacts of RJ-11's that worked well were tapered like a gear might be.

I also noticed that the ribs on RJ-11's that did not connect as well were much more blunt.

I am assuming the RJ-11's are made by different manufacturers, and also that these are made outside of the U.S.

Is there an international standard that an
RJ-11 is to be manufactured to?
 Answer by Joseph Golan posted 04 May 2005
Dear Keith,

You can view the FCC part 68 which includes the USOC definitions at:


It starts (Subpart F-Connectors) on page 350 of the documaent which is page 90 of the pdf file. The specifications for the 6 pin (RJ-11) follows on the following pages (353, PDF 93).

I believe that all manufacturers are supposed to conform to these measurements (there are separate minimum and maximum dimensions).

While this is not an "International" standard there are references in the document to other EIA/TIA documents that cover this sub ject (EIA/TIA document are not available on-line but can be ordered through Global Engineering Documents.

Joseph Golan, RCDD

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