Re: CAT5 568A v. 568B..Hmmm..odd problem?

["BruceR" <razrbruce@xxxxxxxxxxxxxxx>]

 NewsReader wrote:
> BruceR wrote:
>>  NewsReader wrote:
>>> BruceR wrote:
>>>> You can use A or B and still carry phone traffic.  Line 1 goes on
>>>> the center pair (pins 4&5; Bl/Wh-Wh/Bl) which are the same in both
>>>> 568A&B. If you have a line 2, that would go on pins 3&6 which is
>>>> normally used by the ethernet connection. So, if you want to run
>>>> ethernet and 1 phone line you can do so. If you want a second phone
>>>> line you'd have to put it on pins 7&8 and modify your phone plugs.
>>>>
>>>>  funkykev@xxxxxxxxxxx wrote:
>>>>> On Mar 1, 10:44 am, Lewis Gardner
>>>>> <lgard...@xxxxxxxxxxxxxxxxxxxxxxxxxx>
>>>>> wrote>
>>>> <snip>
>>>>  The exception, I believe, is that if you intend to carry
>>>>> internet or similar AND a Ma Bell phone signal through the same
>>>>> cord, then you need to wire for A at your receptacles?  This,
>>>>> however I have not confirmed.  There you go.  have at it...and
>>>>> thanks! Kevin
>>>>
>>> Yeah - but you're forgetting USOC pinning where the pairs are
>>> Line 1 bl/w on pins 4,5
>>> Line 2 o/w on pins 3,6
>>> Line 3 g/w on pins 2,7
>>> Line 4 br/w on pins 1,8
>>>
>>> Commonly found on flat (silk) cable with parallel conductors in a
>>> sheath. If you want packet loss try this pinning - the data is on
>>> split pairs and is effectively unshielded.
>>
>> Trust me, after 35 years in the business I haven't forgotten USOC
>> wiring. 568A & B both keep the bl/w pair on 4&5 and the orange or
>> green pairs, repectively, on 3&6.  It's the green or orange pairs,
>> respectively, that get moved to 1&2 and the brown pair that goes to
>> 7&8. So, in either case, you still have USOC wiring for a two line
>> phone available at the jack with the caveat that line two is
>> terminated on the green pair if it's 568B.
>>
>>
> Keep it up and we're going to dust off some 1A2 equipment and make you
> explain how to wire it up... Or maybe reverse the polarity on your TT
> keypad to prevent you from making any bulletin board calls...  hehehee

Both I can do. I cut my teeth on 1A2 to the point where I could punch it
down in my sleep. Well, maybe not the ringing diode matrix :)   I used
to charge $50 to take the shims out of 1A2 keystrips to enable multiline
conference calls. There's still a lot of that stuff in use... just take
a look at David Letterman's phone!
BTW, for those who don't know what USOC means, it stands for Uniform
(not 'universal' as some report) Service Order Codes.  Every piece of
telco equipment or service or wiring configuration had a USOC
designation. Even if it was special or "one-off" it was a ZZZxx.