[VoIP] Channel Bank on Ebay [not mine] and E&M

[John Novack]

windmill wrote:
> Unfortunately the RJ standard may have begun with the best intentions 
> but like so many 'standards' it has become corrupted to such a point 
> as to be confusing at best. I have always known an RJ11 as a 4 wire 
> connection to any piece of US telephone equipment and pretty much 
> everyone I know has the same idea.
>
Mostly in the computer field, I would bet. Too many computer types don't 
bother to research telephony in depth.
Those who have been in telephony TOO long know better.
RJ11 is, and always has been, a single line.
RJ12 and 13 had connections to 1A2 key systems, but I don't have a 
reference handy to go into greater detail. One had T&R before the key 
equipment, the other after, and A and A1 were brought out to the jack, 
from memory. Been 20 plus years since I did any 1A2 on any but 
collectors systems, and never used the registered jacks for that purpose.
It was mostly a revenue generator for the BELL System in the early days.
RJ10 doesn't exist, except in someones imagination.
> Now I did note the previous post and if you re-read my post you will 
> see that I was asking what RJ10 and RJ12 were. I mentioned what I 
> understand an RJ12 plug to be but I was not asking about plugs at all!
>
> My question stands!
>
> Brian
>
> John Novack wrote:
>> Repeating a previous post.
>> Handset plugs and jacks HAVE NO RJ designation.
>> All Rj designations refer to the wiring pattern and connections starting 
>> back in 1978.
>> Refer to FCC  Part 68 BEFORE 2000.
>> Google should be your friend.
>> RJ 12 and 13 reference connections to 1A2 key systems, RJ14 is 2 lines 
>> on one jack, RJ-25 is three lines on one 6 pin jack.
>> RJ3x and 4x are 8 position modular .
>>
>> John Novack
>>
>>
>> windmill wrote:
>>   
>>> Steph,
>>>
>>> Perhaps you can clarify what RJ10 and RJ12 are, I had always thought the 
>>> RJ12 to be a telephone handset plug but I have never really known what 
>>> an RJ10 is. My Crimping pliers do RJ45 (8P8C), RJ11 (6P6C) and a 4P4C 
>>> connector which I believe is RJ12. I have seen a two pin version in this 
>>> same series used internally in some telephones, would that be RJ10?
>>>
>>> Brian
>>>
>>> Steph Kerman wrote:
>>>   
>>>     
>>>> Thanks for the clarification. 
>>>>
>>>> That has to be a moniker that someone invented, in other words, sort of 
>>>> a fiction.  It has no real legitimacy no matter how many people may use 
>>>> it, the way RJ11 and most others do.  Many people also refer to the 
>>>> handset jack as an RJ22, another mis-invention in this case since the 
>>>> RJ22 actually is a documented and defined interface that uses a 25 pair 
>>>> Amphenol mini-ribbon connector to connect to multiple lines.
>>>>
>>>> Regardless of its popular use, RJ has a formal meaning.  It refers to a 
>>>> "registered jack" under the FCC program that was established to allow 
>>>> direct connection of privately owned equipment to the public network.  
>>>> Since the Bell System was never forced by the FCC to allow connection of 
>>>> privately owned equipment to their own phones at the handset interface 
>>>> (as opposed to directly to the line itself), no RJ was ever defined 
>>>> using the 4-position jack.
>>>>
>>>> Steph
>>>>
>>>> Mark Rudholm wrote:
>>>>   
>>>>     
>>>>       
>>>>> RJ9 is the small (four conductor positions) connector
>>>>> used on handsets and handset cords.
>>>>>
>>>>> (it's not normally used for phone lines, with some
>>>>> weird exceptions, like Sangoma FXS PCI cards)
>>>>>       
>>>>>         
>>>>>>>   
>>>>>>>
>>>>>>>         
>>>>>>>           
>>>>>>>             
>>>>   
>>>>     
>>>>       
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>>>   
>>>     
>>
>>   

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