Read more at https://www.channelnewsasia.com/news/singapore/fibre-cable-service-outage-east-singtel-starhub-netlink-trust-10930222
(Updated: )
Full Power Sparkii
As far as we know, the system was suppose to be robust due to system architecture if SDH was implemented by Netlink Trust. Obviously this is not the case. Has Netlink trust implemented SDH?
Ricky Lim
Thought SDH or SONET is the system architecture of the Telecom companies and not the fibre company.
SDH or SONET are self-healing architecture that will reroute the traffic by loop back and go into the redundant route - but this is the switch architecture - and not the physical fibre architecture.
Also thought that now Telecoms are upgrading to DWDM and not SDH (European standard) or SONET (US standard) as DWDM has higher capacity than SDH or SONET.
SDH or SONET are self-healing architecture that will reroute the traffic by loop back and go into the redundant route - but this is the switch architecture - and not the physical fibre architecture.
Also thought that now Telecoms are upgrading to DWDM and not SDH (European standard) or SONET (US standard) as DWDM has higher capacity than SDH or SONET.
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Ricky Lim
Also SDH, SONET or DWDM are usually the architecture for the backbone - and are usually not deployed in the last mile - which is FTTH (Fiber to the Home).
The last mile FTTH will rarely have redundant feature - as it need to terminate into a IP gateway to enable IP traffic over SDH, SONET or DWDM overlay.
The last mile FTTH will rarely have redundant feature - as it need to terminate into a IP gateway to enable IP traffic over SDH, SONET or DWDM overlay.
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Ricky Lim
When the fiber are severed by construction work --- fusion splicing of the fiber will need to be done.
Imagine armour multiple core single fiber are being severed by the construction work --- there is need to :-
(1) strip the fiber - all the exterior cladding
(2) clean the fiber with alchol
(3) cleave the fiber to ensure proper alignment
(4) splice the fiber to automatically align the fiber and fuse the broken fiber
These are tedious work as it involve multiple fiber cores.
On the hindsight, why the contractor did not deploy "pub underground checker" to check the location of the underground fiber before it dig to avoid severing the armoured fiber.
Imagine armour multiple core single fiber are being severed by the construction work --- there is need to :-
(1) strip the fiber - all the exterior cladding
(2) clean the fiber with alchol
(3) cleave the fiber to ensure proper alignment
(4) splice the fiber to automatically align the fiber and fuse the broken fiber
These are tedious work as it involve multiple fiber cores.
On the hindsight, why the contractor did not deploy "pub underground checker" to check the location of the underground fiber before it dig to avoid severing the armoured fiber.
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Full Power Sparkii
Ricky Lim 10K users affected implies backbone affected, not last mile cable cut. Currently fibre backbone is owned and managed by Netlink trust. I feel it is unfair to penalise contractors only when network operators can't even indicate correctly where the plant is on the plans.
Full Power Sparkii
Ricky Lim they do not use armour cables for service delivery. armour mostly for submarine cable or class 1 datacentre
Ricky Lim
Full Power Sparkii -
(1) Telecom network backbone refer to connectivity between the multiple Data Centres for Singtel or Starhub --- this is where SDH, SONET or DWDM are deployed - and redundant network design are inherent.
As for 10k users to 4 areas - it sounds like FTTx - to some blocks are affected - and did not trigger the re-route inherent in the SDH or SONET - nor the ring topology for loopback in DWDM.
(2) There are many contractors doing road work - could be water pipe, road, gas pipes etc - if they did not approach the fiber contractors for plan - then plan cannot be dish out.
Btw the cable plan supposed to be confidential - and should not be freely issued - as it will be a security risk.
Contractors by default or factor into tender that "underground pub checkers" should be used to detect cable route and avoid them (note:- even if plan is dished out, if contractors cannot see clearly on the ground like x-ray -- they will still break the cable).
(3) Armor fiber are compulsory for all outdoor cable - else how to endure the wear and tear of outdoor environmental factors of rain, shine, heat, earth, water, pressure etc.
Armor fiber is not required for indoor cable.
(1) Telecom network backbone refer to connectivity between the multiple Data Centres for Singtel or Starhub --- this is where SDH, SONET or DWDM are deployed - and redundant network design are inherent.
As for 10k users to 4 areas - it sounds like FTTx - to some blocks are affected - and did not trigger the re-route inherent in the SDH or SONET - nor the ring topology for loopback in DWDM.
(2) There are many contractors doing road work - could be water pipe, road, gas pipes etc - if they did not approach the fiber contractors for plan - then plan cannot be dish out.
Btw the cable plan supposed to be confidential - and should not be freely issued - as it will be a security risk.
Contractors by default or factor into tender that "underground pub checkers" should be used to detect cable route and avoid them (note:- even if plan is dished out, if contractors cannot see clearly on the ground like x-ray -- they will still break the cable).
(3) Armor fiber are compulsory for all outdoor cable - else how to endure the wear and tear of outdoor environmental factors of rain, shine, heat, earth, water, pressure etc.
Armor fiber is not required for indoor cable.
Edward Haxor
Just use your mobile data if you really crave so much to get online.
Ricky Lim
All mobile and WiFi service also ride on the underlying fiber services.
As mobile base station and WiFi access point has to be connected to the telecom switches which in turn connected to the fiber infrastructure.
When the fiber infrastructure is cut --- internel services, TV digital services, mobile phone services and WiFi services will be completely cut off.
Thus Singtel, Starhub, M1, MyRepublic all services will be unavailable ---- as their Telecom infrastructure all ride on Netlink fiber infrastructure.
As mobile base station and WiFi access point has to be connected to the telecom switches which in turn connected to the fiber infrastructure.
When the fiber infrastructure is cut --- internel services, TV digital services, mobile phone services and WiFi services will be completely cut off.
Thus Singtel, Starhub, M1, MyRepublic all services will be unavailable ---- as their Telecom infrastructure all ride on Netlink fiber infrastructure.
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