Cityrail meltdown

[terryc]

Matthew Geier wrote:

> If you are going to concentrate control like that, make dammed sure the
> backup systems work....

apparently that was the problem - the kick over to the backup system failed.

[Matthew Geier]

On Wed, 13 Apr 2011 22:31:24 +1000, terryc wrote:

> Matthew Geier wrote:
>
>> If you are going to concentrate control like that, make dammed sure
>> the
>> backup systems work....
>
> apparently that was the problem - the kick over to the backup system
> failed.

DR (Disaster Recovery) systems need to be regularly tested. One assumes
they do actually regularly test all such systems (on Sunday morning or
something).
Still every thing may have been recently tested , but the hand over to
the backup system chose an importune time to fail itself.

Would be interesting to know what happened.

And Cityrail were working at one point on consolidating the 'superboxes'
into one central control centre - but that project ran into difficulties
and was abandoned in the end.

[johnsuth]

In <4da5f60d$0$13390$afc38c87@news.optusnet.com.au> , Matthew Geier <matthew@no.sleeper.no.apana.no.org.no.au> writes:
>On Wed, 13 Apr 2011 22:31:24 +1000, terryc wrote:
>
>> Matthew Geier wrote:
>>
>>> If you are going to concentrate control like that, make dammed sure
>>> the
>>> backup systems work....
>>
>> apparently that was the problem - the kick over to the backup system
>> failed.
>
> DR (Disaster Recovery) systems need to be regularly tested. One assumes
>they do actually regularly test all such systems (on Sunday morning or
>something).
> Still every thing may have been recently tested , but the hand over to
>the backup system chose an importune time to fail itself.
>
> Would be interesting to know what happened.
>
> And Cityrail were working at one point on consolidating the 'superboxes'
>into one central control centre - but that project ran into difficulties
>and was abandoned in the end.

If they had simultaneous parallel supplies to the bus bar then there would be no
need for a kickover device.