Talk:RJ11, RJ14, RJ25

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[edit] Digital vs. Analogue

A British friend of mine refers to RJ-11 as "digital phone cable". I thought it was analogue. Does anyone who knows feel like including either appropriate term in the main article? samwaltz 10:23, 7 June 2006 (UTC)

There's nothing the least bit digital about RJ11, and it also has very little to do with cable, but many people mistakenly believe that the 6 position modular connector is what "RJ11" means, and that same connector is in fact used by many digital phone systems.
I suppose it deserves mention that RJ11 is about POTS (classic analog) telephone lines, since there are other kinds now. I'll do that. Bryan Henderson 02:44, 24 August 2006 (UTC)
The reason for this is that the standard POTS connector in the UK is the BS-6312 one, to the non-technical eye this looks completely different to the RJ series. OTOH, ISDN uses the RJ-45 connector and ADSL uses RJ-11 both of these are digital and "obviously" very similar to each other. Likewise in the office you're likely to have a "digital phone system" running over the RJ-45 structured cabling; ie another "digital" system on the "digital" connector. So no surprise the entire RJ connector series is seen as "digital" really. 86.16.135.53 10:53, 28 October 2006 (UTC)

We really need to keep RJ11 intact. We just bought a V02 data acquisition system to measure metabolic rates during stress tests. This is pretty state-of-the-art equipment and it uses an RS-232 interface. The best way to drive this from a laptop is to use an RJ11 to RS-232 cable. It won't work with a USB to RS-232 adapter.

Why would anybody use RS-232 on new equipment? jj

1) RS-232 exists for far more devices than USB. The world is not a Window PC.
2) RS-232 is VERY cheap and simple; ps/2 keyboard connectors are cheaper than USB because of this. In fact RS-232 is so simple any microprocessor can use bit twiddling to create one in software.
(Yes I mean any uP, 8051, 6502 and up) 86.16.135.53 10:53, 28 October 2006 (UTC)
PS: no 5 metre range limit either.

I think either all RJxx conectors should be independent articles or merged with modular connector, ZyMOS 18:34, 10 October 2006 (UTC)

[edit] DSL

What's going on with the 4 RJ-11 wires with a home voice/DSL line? the wire carries audio, video and a smalll amount of electricity to power certain items such as security cameras.

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