atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems DSX T1

Well, we installed a relatively large DSX160 on Friday and used a DS2000 T1 card with 16 active channels until the pri comes to market.

This afternoon they called and said that calls were dropping. The phones still show that they are connected but the line is dead silent and the person on the other end is getting disconnected. Has any else had this problem?

If not does anyone what is needed to try and gother some info to see what is going on. Its a decent system if I could just get this figured out. Course I still haven't ruled out the fact that it could be the carrier.

Any help is appreciated.

-Roy

Not being a T1 expert, I would first ask ---

Is this a new install of the system or a change out?
Was the T1 installed and working in the old system?

Yes, check that it is working ahead of the system.

I believe from the symptons you have described it is a T1, not system, issue.

But I've been wrong before. :rolleyes:

Ken, change the image on your website to a better DSX graphic.....it looks better....

Im not sure about the DSX, but I know the DS2000 with a T1 card was very picky if not grounded properly

Might want to check that out

Any way to get any reporting of errors from this T1 to see whats going on?

Grounding is good and wired straight to cold water pipe AND ground bus from electrical panel. (i'm paranoid about grounding if you couldnt tell)

Rage
If possible call NEC field engineering, they will instruct you on connecting you lap top to the DSX so that history can be collected. Also call the provider can monitor the T1 at the cusomter site.
Is the T1 being shared with data? If so any problems on that side?

Dan S

I called the carrier and of course they said there were no issues on thier side (what a shock). On hold with NEC as I type so we'll see.

Well, called NEC and they are sending the cables to gather the traces. We'll know more on that tommorow when that arrives.

As for the carrier I talked to an engineer with them and they reported having 940+ slips since Friday. They are working on it and will keep everyone posted.

Thanks again for all the replies and help.

Rage,

slips are mainly caused by timing errors. There can only be one clock source on a T1 circuit. I bet you and the CO are both set for "Master". You should be set for "Slave" so you can obtain timing from the CO. Look in program #1213 and see if you are set for Master, which is the default setting.

Bill

Well, had them set to be a slave clock on the carrier circuit and still no help. All i get from the carrier is that tier 2 tech is working on it.

The other thing we noticed is that it always inbound calls. As far as I can tell no on ehad ever been dropped when the call was placed out. Also,a couple times when they called in the person that got the call could hear just fine but the caller could not hear them. Also, 3 cell phones cannot use the auto attendant, When they try to dial an extension it just goes back to main greeting (like its not recognizing the digits). I did get the serial adapter today so will hook up tomorow but client is getting irritated and so I am.

Am I correct is thinking this is full carrier issue?