Thomas Lapp <thomas%mvac23.uucp@udel.edu> (02/10/90)
I recently found out the hard way that a device which is expecting an
RJ-41S jack will not work with an RJ-11 jack (even though the modular
plug fits!).
I'm wondering what is unique about an RJ-41S termination other than
the fact that it seems to be used for data terminal equipment like
modems?
Thanks for any help you can give,
- tom
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Quote : Virtual Address eXtension. Is that like a 9-digit zip code?"John R. Levine" <johnl@esegue.segue.boston.ma.us> (02/12/90)
In article <3732@accuvax.nwu.edu> you write: >I'm wondering what is unique about an RJ-41S termination other than >the fact that it seems to be used for data terminal equipment like modems? The RJ-41S is a general purpose data jack. It contains three different things: the first is the regular tip and ring, the second is a FLL pad that provides a signal suitable for equipment expecting a fixed loss loop, the third is a programming resistor (chosen at installation time) for equipment that has an internal FLL pad. (Note that this "pad" is unrelated to an X.25 PAD, I don't know what it stands for in this case.) An RJ-41S jack has a switch to flip between regular tip/ring and FLL tip/ring. Your RJ-41S equipment probably depends on the FLL pad so if all you have is an RJ-11, you're out of luck. If it just needed the programming resistor, it could use the simpler RJ-45S jack with the resistor but no pad. Regards, John Levine, johnl@esegue.segue.boston.ma.us, {spdcc|ima|lotus}!esegue!johnl