SOME ONS ports no ring voltage

[MitelInMyBlood]

I have a remote site in B.F. Louisiana that I think got nailed by lightning yesterday. It's a 3300 MX (7.0) with an 2K per node on it. All is well except the ONS ports (on the per node) do not ring (no ringing voltage at tip/ring)

You can hear ringback when dialing them, and they can place calls outbound OK and strangely one of the ports is working. There's only a single ONS card in the PER. I talked the guy on site thru swapping the ONS card (MC320) but exact same symptoms. No alarms on the system. I'm sending him a power supply (MP914) and a Per node Resource card (sits inside below the Fim, (Msg links and Ckt switch links buss goes through it). Aside from sending over a whole per node I can't think of anything else it might be. If it was the PSC card there'd be an alarm on it. There's a DNI card in it too but those sets are OK.

Anyone else have an idea?

Original MUG/NAMU Charter Member

 

[kwbMitel]

I suspect the PSU will do the trick.

The 48Vdc is probably out of whack or the rectifier.

The one phone that still rings probably has a lower threshold for voltage required to ring. This would mean it would work on another port as well. Easily proven if right.

*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.

 

[MitelInMyBlood]

I hope so. It's a 6-1/2 hour drive from here & I'm getting too old for that. Unsure about threshold voltage tho. The guy that's there is not a tech but knows a little about how to use the butt set that's out there. I had him open the bridging clips and get on the pbx side of the block where he could pull dial tone then had him call me (so I could see the DN he was clipped onto) then I dialed him back. He said he got no indication of a ring on the butt set, so I'm not real optimistic. I doubt it's the Per resource board, but changing that might be easier than me crating up a whole per node to send him.

It also could be programming FSK receivers & Class/Clip causing it, except it's not an ONS Class line card. There's 8 stations programmed on the card & I checked the programming from here, even tried reassigning one to another PLID. Same, no ring voltage. There's nothing you can see from here that gives any indication of a problem and no local alarms there. Just about got to be the PSU. Will find out when the little brown truck gets there in the morning.


Original MUG/NAMU Charter Member

 

[Opsmgr06]

Check the MP914AB/AD Power converter if there is a green led on the front the MP914AB/AD is ok as all voltage rails are up - Lightening strike normally kills the -27/-48V rail which in turn feeds the forced DC -90VAC ringer circuitry,
so if you had DNI Cards and superset phones there would be issues with those and no green LED.
The Per Cab has a mains PDU in the rear with a 5A Crystal fuse this runs the air circulation fans but in this case is not damgaged they rarely do get blown.
I think your ringer is dead which is in the centre of the PCB on the MP914AB/D.
This was the most common fault I dealt with in my former incarnation on repair units ;-)

 

[MitelInMyBlood]

Thanks.
We'll find out today as the MP914 should be there around 10:00 this morning. The strange thing is 1 port on the ONS card still works/rings OK.

The SS4150 sets in the office are working OK. They put the analog ports all on a per node card to keep them off the AMB and thus out of harm's way in the main control, realizing that lightning would be a risk. It was not my install, as I probably would have used an OPX card for the analogs (better protection). There's also only one IP set on the system, sitting on top of the per node in the comm. closet. Reason for no IP sets is this is a harsh environment w/long loops to the instruments (too much loop length for IP).

I didn't think to ask him if the P_Node fans were running but assume they are else I think there would be an ancillary minor....at least there would been in an SG



Original MUG/NAMU Charter Member

 

[kwbMitel]

Have you tried placing the working analog set on a different port as I suggested earlier.

I believe it is only working because it has a lower voltage threshold for ringing. Or a wider tolerance whichever applies.

This would mean it should work on any port.

*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.

 

[MitelInMyBlood]

Replacing the PSU fixed it.

On further investigation the fellow onsite (not a phone tech) noticed after changing PSUs that the original PSU had a red light on it and the replacement had a green light. I did not even think to ask (duh..)

Also, the DNIC sets (SS420s) were all working, as far as we knew.

He did not try moving the "working" phone because it wasn't an actual phone. It was a fax machine with an electronic ringer. (couldn't swap jumpers as no tools on site except the old butt set and I don't even know why that was there or where it came from) The other stations were std 2500 sets with 0.8 REN ringers. However, with the butt set clipped on at the 66-block I would have thought he'd have heard a little ringing current if that was the case. Anyway it's fixed, so thanks for your input.

I'm going to check on repairs now as this makes a total of 3 bad MP914s we have and no more spares. I may check the secondary market, may be able to buy replacements cheaper tham having these fixed.

Original MUG/NAMU Charter Member

 

[whykap]

Here is a reputable second market company. They do all repairs in house and offer 2 yrs warranty. Not bad.
The MP914 will cost you $175 each to repair. Not a bad price.

Here's the link:

http://www.deanenterprises.net/pages/repairs_pricing.aspx

I am sure there are others, I've done a lot of work with these folks in the past as they are local and they have always been great.

 

[MitelInMyBlood]

Thanks whykap - that's the same folks we've been using for over 15 years. I just called them and as suspected replacement is much cheaper than the repair charge and only half as much freight charge (one way stead of round trip)



Original MUG/NAMU Charter Member