Hi, With Telstra's outage taking out the Northern and Western suburbs of Wellington. For what I gather it was a single truck crash bringing down the overhead wires. A single truck crash is a single point of failure, but I remember this email http://list.waikato.ac.nz/pipermail/nznog/2005-June/010158.html which says: "For a start, it takes more than two fibre cuts in the North Island to disrupt us" And also remember back early in the year when one slip on the Hutt motorway took out all services in Wellington. What is so wrong with Telstra's network that single events can affect so many people, when supposable it takes more than two fibre cuts to disrupt them? David
In case it interests people, I had an update from TelstraClear on the outage: Yesterday at around 1pm a truck with a large tank at the back went through some overhead cables in Khandallah. It appears there was substantial damage, with the cables being stretched as well as severed and TCL may have to replace up to one kilometre of the fibre. ETA for resolution is some time tonight according to TCL. -- Juha Saarinen www.geekzone.co.nz/juha | Skype: juha_saarinen blogs.pcworld.co.nz/pcworld/techsploder www.computerworld.co.nz | MSN: juha_saarinen(a)msn.com Voice: +64 9 950 3023 Subtle recursive jokes in .sigs are not funny.
The fault yesterday did not affect our Core network. All protection switching worked as expected. The outages experienced by customers were as follows: * the CATV/Cable modem network for Karori area only. * phone services for approx. 300 homes, as one of the two fibre cables cut was a cabinet feed on a spur. * some IP customers who are on a point to point service (e.g, a customer with a 1Gb feed, with 100Mb backup from another switch. They pay for this service to be as it is.) The slip earlier this year did not take out all services, it only took out CATV/cable modem services, plus a few point to point IP customers. Once again our core network performed as designed. All CATV/Cable modem services are currently supplied via point to point. -- Michael Newbery IP Architect TelstraClear Limited
At 09:19 a.m. 21/12/2006 +1300, Juha Saarinen wrote:
In case it interests people, I had an update from TelstraClear on the outage:
Yesterday at around 1pm a truck with a large tank at the back went through some overhead cables in Khandallah. It appears there was substantial damage, with the cables being stretched as well as severed and TCL may have to replace up to one kilometre of the fibre.
For Operators with layer 1 networks, this is a layer 0 problem. Either the lines were low, or the truck was high. From memory, the truck should be under 4.6meters and the lines should be above 5.5m. (memory a little faded). My lines overseer used to measure the height with his ladder, when rungs were a foot apart. Which is why you always carry a ladder. (it also helps you pull them up, if they are a tad low) Of course now that men are boys, the rungs are a few inches apart, or they use a cherry picker.....or bury everything. (there are many, many stories to be told over beer, to get things back on topic) I hope TCL caught the truckie and measured his load. The Police do have a road transport group, but they tend to be out of town worrying about weight. TCL should make sure they get the Police back in town to lean on a few truck operators. This seems to happen every 2 years, sadly. Rich
On Thu, 21 Dec 2006, Richard Naylor wrote:
At 09:19 a.m. 21/12/2006 +1300, Juha Saarinen wrote:
Yesterday at around 1pm a truck with a large tank at the back went through some overhead cables in Khandallah. It appears there was substantial damage, with the cables being stretched as well as severed and TCL may have to replace up to one kilometre of the fibre.
For Operators with layer 1 networks, this is a layer 0 problem. Either the lines were low, or the truck was high.
From memory, the truck should be under 4.6meters and the lines should be
4.25m is the maximum height for a non-permitted vehicle, including any attachments (such as an antenna). Don't know the exact details for class 1 and class 2 over-height load permits, but anything high enough to be interfering with properly-strung cables definitely needs a permit.
I hope TCL caught the truckie and measured his load. The Police do have a road transport group, but they tend to be out of town worrying about weight. TCL should make sure they get the Police back in town to lean on a few truck operators. This seems to happen every 2 years, sadly.
If TCL can provide a certified measurement of the height of the truck, I imagine CVIU will be interested. They take a dim view of vehicles exceeding any of the dimensional rules, it's just easiest (and the most lucrative) to catch the ones who're over-weight. -- Matthew Poole "Don't use force. Get a bigger hammer."
With international connectivity through southern cross cable this is the same, you can either have all your traffic go via sydney and that way round the figure 8 fiber and if it's broken then you;re down till it's fixed.... If you pay for a protected circuit the traffic re-routes via an alternative path.
From memory with TCL cable, if it's an outage on a main pipe linking wellington & auckland, well then they'll switch traffic, however if the break is local and close to you, then you require a protected circuit depending on capacity in your location.
Barry
Hi,
With Telstra's outage taking out the Northern and Western suburbs of Wellington. For what I gather it was a single truck crash bringing down the overhead wires. A single truck crash is a single point of failure, but I remember this email http://list.waikato.ac.nz/pipermail/nznog/2005-June/010158.html which says: "For a start, it takes more than two fibre cuts in the North Island to disrupt us"
And also remember back early in the year when one slip on the Hutt motorway took out all services in Wellington.
What is so wrong with Telstra's network that single events can affect so many people, when supposable it takes more than two fibre cuts to disrupt them?
David
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participants (6)
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Barry Murphy -
David Robinson -
Juha Saarinen -
Matthew Poole -
Michael Newbery -
Richard Naylor