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crossover T1 cable

Created by: FryGuy,Last modification on Sat 09 of Apr, 2005 [10:13 UTC] by Randomandy
The below diagram is not quite correct. For industry references, see instead: T1 Crossover Cable

When I got my Adtran TSU 600 unit for use with a Digium T100P card, it shipped with a straight through T1 Cable, however, this setup (and I'd assume all using T100P) requires a crossover cable. Instead of destroying the cable that it came with, I created my own using standard Cat-5 cable used for ethernet. I had a spool available and a few ends, so I cut off a few feet (the TSU and server are in a rack mount) and got a couple ends.

It's also useful to check if the configuration for a TE4xxP card is correct or to check if the card is functioning.

The wiring is:

1 — 4
2 — 5
4 — 1
5 — 2


Image

Side 1 (left is cable end, clip underneath):
Pin 1: Orange Striped
Pin 2: Orange Solid
Pin 3: none
Pin 4: Blue Solid
Pin 5: Blue Striped
Pin 6: none
Pin 7: none
Pin 8: none

Side 2 (left is cable end, clip underneath):
Pin 1: Blue Solid
Pin 2: Blue Striped
Pin 3: none
Pin 4: Orange Striped
Pin 5: Orange Solid
Pin 6: none
Pin 7: none
Pin 8: none


Comments

Comments Filter
222

333a better scheme

by robertorocha, Tuesday 05 of February, 2008 [13:32:51 UTC]
http://www.corelatus.com/gth/faq/img7.png
222

333

by kheston, Friday 28 of April, 2006 [18:12:11 UTC]
Adtran says:

This cable can be used to connect two T1 CSU/DSU (i.e.,TSU) products in a back-to-back configuration.
1 - 5
2 - 4
4 - 2
5 - 1

http://www2.adtran.com/support/technotes/t1ddsadptxvr/
222

333

by kheston, Friday 28 of April, 2006 [17:28:40 UTC]
phatboyle, your link has gone stale. I'm having issues connecting a TA750 to a Sangoma A101U, would you mind posting the pinout you used?
222

333Re: t1 crossover wiring

by masonc, Tuesday 03 of May, 2005 [00:25:37 UTC]
I don't see any difference, other than the conductors that are not in use.
222

333Re: t1 crossover vs ethernet xo

by Randomandy, Saturday 09 of April, 2005 [10:07:42 UTC]
Not quite. (:cry:) Unfortunately, Ethernet needs to swap 1+2 with 3+6 instead of 4+5 in the case of a T1.
Cisco Ethernet Pinout Reference
So an off the shelf ethernet x-o cable can not be used for this application.
222

333t1 crossover

by , Saturday 29 of January, 2005 [13:25:51 UTC]
looking at your diagram that would be the same as a stendard cat5 crossover.... except your polarity is also reversed, not sure if that was your intention or not
222

333t1 crossover wiring

by phatboyle, Sunday 25 of April, 2004 [21:56:36 UTC]
The pinout on this page didn't work for me. I used the pinout on the following link, which did work:
http://www.gcom.com/home/support/t1crossover.html