I won't go into the gory details of today's XT network outage. There's enough "experts" around - and a lot of them seem to gather on this Geekzone discussion.
But here is just some background information you ought to know regarding the Telecom XT network.
There are two RNCs in the XT network. One in Auckland and one in Christchurch. These are Tier 0 sites - Tier 0 sites have the highest levels of availability (power, connectivity etc) and the strictest change control procedures.
A network of similar size to Telecom XT could quite easily have been built with one RNC but two RNC provide added resiliency into the network. A single event would not affect all customers.
And that's what happened.
A RNC is a platform made of multiple redundant components. You can imagine that a total RNC failure means quite a serious issue. It appears the issue cascaded to affect the way cell sites restart which is what happened during the day. It was the establishment of communications to each cell site turn took its time and delayed recovery for the part of New Zealand affected - those living south of Taupo it seems.
I am told this issue is being "analysed" at the highest levels of both Telecom New Zealand and Alcatel-Lucent, the technology provider.
There's only one thing I want to tell you:
(For those of you who don't get it.)
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