[VoiceOps] T1 Crossover Cable

David Wessell david at ringfree.biz
Fri Oct 31 14:53:14 EDT 2014


Thanks a ton for the feedback! We didn't have boots on the ground so
visibility was difficult. I really appreciate the responses.

It was a 904 on the T1 0/2 interface. A straight ethernet worked just fine.
It turns out that there were two issues.

1) There was a cable crimping issue (I know, right)
2) The PBX was configured as a fractional T1 (16 channels) and we had the
904 configured for the full 24 channels.

Again. Thanks to everyone!

On Fri, Oct 31, 2014 at 2:18 PM, Jay Hennigan <jay at west.net> wrote:

> On 10/31/14, 6:17 AM, David Wessell wrote:
> > So two different answers :)
> >
> > It's a 904 connecting on the t1 0/2 DSX interface.
> >
> > The main issue is that we keep getting D channel is DOWN.
> If the T1 interface itself is up, the cable is correct.
> The 904 has two T1 interfaces and only T1 0/2 can be used for PRI. When
> connecting this to a PBX, a straight-through cable is most common.
> Any of the "e" series TA900 flavors have four T1 interfaces. T1 0/3
> and/or T1 0/4 can be used for PRI, and these will generally need a T1
> crossover (1,2 swapped with 5,4) to go to a PBX.
> If the T1 is up but the D-channel is down, it isn't the cable. Check
> timing source, switch type, that the PBX uses channel 24 for D-channel,
> user vs. network role configuration, etc.
> --
> Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
> Impulse Internet Service  -  http://www.impulse.net/
> Your local telephone and internet company - 805 884-6323 - WB6RDV
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