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#637090 06/08/20 07:25 PM
Joined: Apr 2005
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Keyset6 Offline OP
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Finally made it to the DCS customer I have in a neighboring state. While there, the contact mentioned they're not receiving faxes. Found there's no ring voltage, and a slight constant chattering like sound on the line, along with the other 7. I didn't know about this trouble of else I would have brought an SLI card. I wonder though - does it sound like that or a power supply? If it was in fact a bad power supply in cabinet 1 - would the 'super capacitor' be on circuit board within the cabinet? Hoping so - thinking so as I may have replaced one on a spare system a while back. If that doesn't hold a charge I'd be re-programming the entire system. I also wonder if the ring voltage comes from the power supplies that insert into the cabiner (PS40, or PS60?) or is that voltage generated elsewhere in the cabinet.

For now I connected a spare analog line to the fax and changed the dedicated trunk to ring the new ext. The customer isn't concerned that it's a different ext, but I want replace what ever hardware is bad. The SLI in question is in cabinet 3. I will look in the manual - but off hand I wonder is it necessary to shut the entire system down to replace that SLI, or can I just power down that cabinet?

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Keyset6 #637091 06/08/20 08:04 PM
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The super cap is in cabinet 1 from memory.
If the card is in cabinet 3 then it's something in this cabinet.
Dodgy slot or card.
In theory you can just switch that cabinet off, been a long time since I worked on dcs system.
Make sure you have a spare psu unsafe the cabinet doesn't come up after being switched off

Keyset6 #637096 06/08/20 11:57 PM
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Super cap is on the motherboard in cabinet 1. Ring voltage is generated by the sli cards from the regular system voltage -55v and there is a ring generator on each sli card. I don't know if you can shut down 1 cabinet or not, I was always under the impression that the expansion cabinets needed to be on first so the main cabinet would "see them".

Keyset6 #637099 06/09/20 12:44 AM
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Thanks for the info. Sounds like it's the card itself. Maybe that chattering/motorboat noise I'm hearing has something to do with the ring generator on the card. We should still have a few SLIs at the shop.

Probably best to shut the whole system off. And yes I was going to bring a power supply or 2 just in case.


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