atcomsystems.ca/forum Forums TDM Business Telephone Systems Vodavi Telephones & Systems XTS with modems

I replaced a Triad 3 equipped with a T1 card that had 4 modems hooked to a SL board.

I replaced this system with an XTS FP 3.0 with a combo PRI on a PRI circuit and a SLIBE. When I use the SL ports I get a very poor data rate and pauses in the data stream. The PRI circuit tests perfectly.

I adjusted the volume up and down on the SL ports with no results. I also replaced the SLIBE, the combo PRI card and the MPB1 card.Of course I get the old Vodavi mantra when I call them with any support call "We never heard of that".

ATT is the provider and their CO is 3 blocks away. All voice functions seem to be perfect. I temped a DX-120 with a PRI card and the modems worked.

This just kills me. An old Triad 3 works fine for 8 years and the new high tech XTS doesn't. It seems every single XTS install has issues. If not software, some weird hardware or firmware issue. It wouldn't be so bad but tech support always says the same thing "we never heard of that".

Any ideas gang? It's getting about time for me to retire I think.

PS: If anybody from Vertical bothers reading this board how about contacting me. I figured with Greer gone and new ownership things might change some. No evidence of it yet.

I know that this probably won't solve your problem, but it is worth a shot. Vodavi issued PN0036, dated November 1997 regarding this issue for Triad and infinite systems. On page 3, they recommend:

"CO to SLT via a T1 trunk:

Access the specific trunk;
Hookflash and dial 638 + 6 on the keypad;
Hang up"

They also mentioned that the maximum speed to be expected is 26,400. All testing and results were using a US Robotics Sportster modem.

I'm using USR external modems. This is affecting both incoming and outgoing calls. The really odd thing is faxes are fine. No modem speed at any data rate works properly, even set as slow as 2400 baud.

I also tried my Thinkpad notebook for testing with the same results. It acts as if something on the data bus in the XTS is blocking the data. It makes absolutely no sense whatsoever, especially since the fax machines work.

What also has me stumped is I have dozens of XTS systems installed without this problem. The only thing different from my other systems is FP3 and a combo card versus a dedicated PRI card. I wouldn't think either should be a problem but who knows?

Just for clarification, the Triad was only using a T-1 and when you installed the XTS you went to a PRI?

It almost sounds like your carrier is somehow transporting this PRI over VoIP. That would explain why the faxes work and your modems do not. But, that also wouldn't make sense if the DX-120 worked.

Do you have a POTS line on the system? If so, have you tried dialing out over it and see what speeds you get?

Sorry...wish I could be more help.

Poor data rates, data blockages, etc, can be caused by improper connectivity due to incorrect cable pinouts. The specific type of cable used with that XTS T1/PRI Combo Card is briefly discussed here. I'll send PMs to dwflood and oobie to see if they can chime in with some helpful assistance. I'm also puzzled by the only types of calls that fly are fax calls. Possibly a wrong type of cable somewhere?

I have a site that we have to send out modems that are connected to analog ports on a XTS on POTS lines other wise they will not work. You can call in to them on a DID and connect fine but if you try to use it to dial out on the PRI same result. I always keep a couple of POTS lines on the system for back and 911 reasons anyways so it wasn't a big deal for me.

*Just a note that the PRI provider is using a softswitch and i beleive that is where the problem is.