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There's a known issue with too many phones having too many simultaneously active LED key lamps drawing too much current. Another reseller told me it had "burned" his cards and cabinet - twice - before they figured it out. It only happens on Communications Servers with seven TDM cards in cabinet one or two.

If you think that might be what's happening to you, have tech support set one of the terminal command values ("Max Base n amber LEDs") to restrict the number of concurrent LEDs.

That is correct Paul, there is an issue, typically with the power supply being overloaded when lighting alot of lamps, especially the DND lamp on most or all of the installed phones. The Amber lamp is actually a combination of the red and the green lighting simultaneously so there is a potential for it to draw a lot of power causing an overload. I've heard in a number of situations that when the customer is asked to refrain fom asking everyone to go into DND at the end of day the problems stop.

That's interesting. I've been running 2 fully loaded 600's just shy of 2 years and haven't lost a card like that yet. Is this an issue with the plastic cabinets or with the redesigned port cards that don't need the port card adapters, or does it affet the metal cabinet 600's as well?

Systems with presence management are more vulnerable because the DSS keys tend to be lit much more than they would otherwise be.

gambitfw, Jim and Brian have good points. If you aren't using presence management that might be why you haven't seen it.

It was explained to me as a problem with the power supplies feeding Communications Servers with two or less cabinets. Without looking I don't recall if the original 600's have different power supplies or if they are also vulnerable.

The reseller who had this issue told me it actually melted part of the plastic chassis.

When ESI recognized this problem after the introduction of PM, it seemed like they started shipping the E-Class systems with the larger power supply (the same larger one you would use on the main cabinet, if expanding to a second Base II cabinet). I've not seen a 600, or any of the large plastic CS cabinets. If I remember right, it seemed like the power supply for the X-Class was about the same physical size (specs may have differed) as the large expansion power supply. If ESI knows that there is a power problem with a feature that the system is designed to use, why haven't they addressed it by changing the size of their power supply, to account for the largest possible draw? That seems like it would make sense to do.

Justin