|
|
|
|
Joined: Aug 2009
Posts: 278
Member
|
|
Member
Joined: Aug 2009
Posts: 278 |
What you are doing wrong is that for a T1, tip and ring are in the reverse order for the orange pair compared to a 568B cable. A T1 plug should be wired R-T-0-R-T-0-0 from pin 1 to pin 8, where "0" means not used. A 568B plug is wired T-R-T-R-T-R-T-R.
So if you wire the plug 568B, you can reverse the color scheme of the orange pair at the other end and get the same result.
Vaya con Dios amigos!
Butch
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
|
Joined: May 2002
Posts: 17,726 Likes: 19
Member
|
|
Member
Joined: May 2002
Posts: 17,726 Likes: 19 |
Well I certainly hope he's figured it out by now. 
Retired phone dude
|
|
|
|
|
Joined: Jan 2005
Posts: 15,384 Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,384 Likes: 13 |
Butch, while you are somewhat correct in the pin assignments, polarity does not matter on a T1 circuit. The only thing that matters is proper placement of the transmit and receive pairs. As long as pins 1,2,4 and 5 are used, that is all that is required.
"A 568B plug is wired T-R-T-R-T-R-T-R. "
Well, sort of on 568B:
Tip 1 is jack position 5
Ring 1 is jack position 4
Tip 2 is jack position 1
Ring 2 is jack position 2
Tip 3 is jack position 3
Ring 3 is jack position 6
Tip 4 is jack position 7
Ring 4 is jack position 8
Yea, I agree that this issue has likely been resolved by now, but it is important to keep even responses to old threads accurate.
Ed Vaughn, MBSWWYPBX
|
|
|
|
|
Joined: Aug 2009
Posts: 278
Member
|
|
Member
Joined: Aug 2009
Posts: 278 |
Ed you are right. I tested a T1 demark extension in the field, and pins 1 and 2 were crossed. Pin 1 at the near end was connected to pin 2 at the far end, and pin 2 was connected to pin 1. The T1 still worked. So it is OK to just leave it that way?
Vaya con Dios amigos!
Butch
|
|
|
|
|
Joined: May 2002
Posts: 17,726 Likes: 19
Member
|
|
Member
Joined: May 2002
Posts: 17,726 Likes: 19 |
It's a 4 wire circuit as long as transmit and receive are correct the tip and ring of the pair doesn't matter. Quote from Ed's post: polarity does not matter on a T1 circuit. The only thing that matters is proper placement of the transmit and receive pairs.
Retired phone dude
|
|
|
|
Forums84
Topics94,428
Posts639,501
Members49,821
| |
Most Online5,661
May 23rd, 2018
|
|
|
1 members (Professor Shadow),
297
guests, and
23
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
|
|
