bigdave1980
Systems Engineer
We have a customer with a Mitel 3300 CXi, with a single ASU containing a pair of 16 port ONS cards. Yesterday I attended their premises and replaced a failed ONS card for the 2nd time this year. I have been told by colleagues that it is very unusual for one of these cards to fail.
I do not know a huge amount about the Mitel hardware, but my theory is there's a fault somewhere within the end user's cabling, such as a short, which may be damaging the cards. The fault presents as a clicking noise on some ports, other ports going into a locked out status, and others just being totally dead.
Upon inspecting the faulty cards, I can see that one or more of the components on each has been damaged by heat. I will add a picture with an example of this circled. The component, whatever it is, turns a very dark colour.
Has anybody else seen this before? Does my theory of a short somewhere, possibly causing to much power to be drawn through one of the ports or causing a port to be over-volted sound plausible? May it be a faulty ASU even? I don't think it will be long before I have to go back there again to replace another of these cards.
Any suggestions would be very much appreciated, please.
Thanks!
I do not know a huge amount about the Mitel hardware, but my theory is there's a fault somewhere within the end user's cabling, such as a short, which may be damaging the cards. The fault presents as a clicking noise on some ports, other ports going into a locked out status, and others just being totally dead.
Upon inspecting the faulty cards, I can see that one or more of the components on each has been damaged by heat. I will add a picture with an example of this circled. The component, whatever it is, turns a very dark colour.
Has anybody else seen this before? Does my theory of a short somewhere, possibly causing to much power to be drawn through one of the ports or causing a port to be over-volted sound plausible? May it be a faulty ASU even? I don't think it will be long before I have to go back there again to replace another of these cards.
Any suggestions would be very much appreciated, please.
Thanks!