atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems Survey: NEC Dterm line cords

Hi Guys,

I'm trying to find out what you techs in the US get on the end of your Dterm line cords. RJ11 or RJ45 plugs??
If RJ11 are they the RJ45 friendly version or the standard version, or do you cut them off and put on RJ45 plugs. If you have to cut them of is it a major problem/inconvenience.??

The reason I ask this is that we have been trying for the past few years to get NEC to put RJ45 plugs on the phones but it seems it's too hard for them..

You'll probably find that the reason they persist with RJ12 plugs is because many of the adaptors currently in circulation are RJ12 especially in OZ and since you can put an RJ12 in an RJ45 socket why move to a slightly more expensive alternative.

rj12 is the small handset cord, rj11 is the typical line cord ,

Skip:

No, no, no. RJ12 is not a handset cord plug. An RJ12 is a six position, four-conductor plug wired with a CO line (pins 3/4) and 1A2 "A" leads wired to pins 2/5. Pins 1/6 are unused.

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Ed
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How come there's always enough time to go back and fix it a second time?

[This message has been edited by ev607797 (edited August 18, 2005).]

I think its the RJ22 plug that's used for the handset.

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| Capitol Communications | Telephone Systems

Nope. RJ22 is not a handset jack. There is no RJ designation for handsets.

RJ (registered jack) was developed by the FCC in the 1970's under USOC, the Universal Service Order Code, so that telephone companies knew exactly how a jack should be wired when installing service. USOC never addressed any jacks and plugs beyond the telephone company's responsibility (the wall) and won't ever. Handsets are not standard electrically, like phone lines are.

You would never call Verizon, Qwest or SBC to install a handset jack would you?

If you would like a more in-depth discussion of this issue, please refer to my earlier post:

https://www.sundance-communications.com/forum/Forum24/HTML/000065.html

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Ed
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How come there's always enough time to go back and fix it a second time?

"You'll probably find that the reason they persist with RJ12 plugs is because many of the adaptors currently in circulation are RJ12 especially in OZ and since you can put an RJ12 in an RJ45 socket why move to a slightly more expensive alternative."

The problem is putting a RJ11/12 plugs into a RJ45 jack is that you damage the outside contact springs which can mean problems if you use the outlet as a data jack in the future. A RJ45 friendly RJ11 has two additional groves moulded into the outer plastic to prevent this problem. True in Oz/NZ they have allot of RJ11 around but most modern businesses have structured cabling with RJ45 outlets and they don't want them damaged..

always the disbeliver , i did a google search and found handset cords reffred to as both rj12 and rj22

we have always called thenm rj12 .

I stand corrected , sort off

That's funny because when I installed a couple tanning beds some time back the manufacturer made certain that I used RJ 22 plugs. Got them and they worked.

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| Capitol Communications | Telephone Systems

NEC will probably never change from the 6 position 4 conductor modular plug as that is the "Defacto" standard here in the US since Western Electric first developed the Modular plugs and jack system.

NEC and many other asian manufacturers have always followed the Western Electric manufacturing processes and are reluctant to change as that is considered "Standard".

I personaly don't like the 8pin modular jacks and using a 6pin plug in them.
Not only can it damage the outer two pins of the 8 pin jack, but the plugs can actually wiggle a little bit and cut off the current flow causing all sorts of intermittant problems.


DJ