norteltx

Haven't seen any memory loss but the power supplies have little grasshopper type fuses that are hard to see when they need reset.

Java_Bob

thanks, norteltx

Mr. Engineer

The Strata DK280 is a robust little tike. As long as the battery to the CPU cards are not dead, it is safe to power down.

But when you power up again, make sure the interface cards are slotted back in exactly as you pulled them out. If you have a missing PDKU card on the left of the cabinet, the system would automatically move the ports forward by 8

Java_Bob

thanks Engineer

ds18s20

Hey Bob,

When you have multi-chassis system and you power it OFF, is there any particular sequence for the power-on order - meaning do you power ON all expansion chassis and then the base chassis? Or do you power all of them ON at the same time?

I know that the CPU runs a scan every time it boots so I figured it will need to have the other cahssis ready so that the bus is responding and cards can be identified properly?

Thanks
Boyan

Mr. Engineer

This is what I do:

Powering down
Switch off the Base cabinet
Then switch off each expansion cabinet one by one

Powering up
Make sure all the Expansion cabinets are off
Switch on the Base cabinet
Then in sequence, switch on the first expansion cabinet one by one, each within the space of about 2 seconds

The reason is because if you switch on all the cabinets at once, (using the Base cabinet to control it) there will be a huge inrush of current which could kill the Base cabinet's power supply. Or might even blow a fuse.
Its just a precausion

ds18s20

Thanks so much for the advise. I will follow the same procedure then. I do have a follow-up question about shutting down.

I noticed that all programs call for moving a jumper into BAT position before programming, but dont mention about moving the jumper back into its original position and neither is it mentioned what that position is?

Why is this necessary? What is the jumper "normal" position and what is the significance of moving it to BAT? I am assuming BAT means the SRAM is feeding from the internal battery, but how can this affect whether the settings are saved afer power-OFF or not?

The manual makes it clear - if you dont move the jumper your programming will NOT be preserved if you power OFF the PBX. My question is why? What does it matter if the SRAM is powered by the battery or by the power supply, assuming that the position opposite to BAT is POWER or something like that?

I suppose I am missing something about the internal CPU design of the common control board?

Thanks
~Boyan

Mr. Engineer

You're right on the Battery function. If you move the jumper away from the BAT, then all programs would be lost once the system is powered down.

The design somehow uses the battery to store all the programmings. maybe its because if the installer made a lot of boo-boo, they can start all over again by removing the battery jumper............

Just that once you start to program the system, make sure it is in the BAT position.

ds18s20

So why would the switch ever be moved to position other than BATT? Only when you want to completely erase the programming?