Re: [SystemSafety] The Lancaster Floods in December 2015

From: Matthew Squair < >
Date: Wed, 27 Jan 2016 20:39:55 +1100

An example of degrading resilience, from telephony. :(

Back in the day the old Strowger exchanges were incredibly tough electromechanical beasts (great fun to play with as well). As an example during the Chilean 'big one' a Stronger unit was buried in the rubble of it's exchange building but kept clunking away switching calls happily for a couple of days until the battery wore down. Early Australian exchanges were Strowgers and used to run to huge battery set pairs which alternated between service and charging as the system was DC, which fortuitously also minimised the effect of unreliable mains power on network services. Fast forward to 1989 when we had the Newcastle (NSW) earthquake (I was there it was exciting) and lo our local exchange only stayed up for a couple of hours until it's batteries died. With the rollout of the Australian National Broadband Network you'd think that battery backup for equipment (in the home) would be mandatory...but alas no. So the next major storm, out goes the power and most people's NBN including telephony.

On Mon, Jan 25, 2016 at 3:44 AM, Peter Bernard Ladkin < ladkin_at_xxxxxx

> Hash: SHA256
> Roger Kemp has kindly agreed to publication of his short note on the
> Lancaster floods on the RVS
> publications page. It is the first item now under "What's New"
> As I say in the
> abstract, I think it is
> one of the most important papers on [engineered systems] resilience which
> I have ever read. It
> lays important issues out so clearly.
> Prof. Peter Bernard Ladkin, Faculty of Technology, University of
> Bielefeld, 33594 Bielefeld, Germany
> Je suis Charlie
> Tel+msg +49 (0)521 880 7319
> INZFzzOIMDLNcSwJJgEebbYBLIDi0ZkVoPBv2hMau072TBYglGbbJu/idk8ByvRt
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> 7p7PBufCGMipDCR4fcOmCMUIRr2uhSYM6xXqOmZYs34UMyrd//lLP5jrKg1FgxfM
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> =rpSj
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*Matthew Squair*
BEng (Mech) MSysEng

Mob: +61 488770655
Email: MattSquair_at_xxxxxx
Website: <>

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Received on Wed Jan 27 2016 - 10:40:09 CET

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