Building a communications network in the Territory

 
  bevans Site Admin

Location: Melbourne, Australia
If one were building a fibre communications network in the Territory, primarily between Darwin and Adelaide what are the important locations one should consider when providing the service.

Rail sidings for example or main locations on the rail line between Tarcoola and Alice and Darwin for example?

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  GrahamH Chief Commissioner

Location: At a terminal on the www.
If one was building a fibre communications network in the Territory, primarily between Darwin and Adelaide what are the important locations one should consider when providing the service.

Rail sidings for example or main locations on the rail line between Tarcoola and Alice and Darwin for example?
bevans
Every location where something electrical or electronic is happening or is likely to happen. Without knowledge of this route; loops, signals, radiocomms sites, level crossings with active indication, axle counters, river flood level indicators, etc etc. Where wouldn't one make provision?
  bevans Site Admin

Location: Melbourne, Australia
The project is looking at a hydrogen based power source for the cabinets required at 95 km length for the optical fibre.
  justapassenger Minister for Railways

If one were building a fibre communications network in the Territory, primarily between Darwin and Adelaide what are the important locations one should consider when providing the service.

Rail sidings for example or main locations on the rail line between Tarcoola and Alice and Darwin for example?
bevans
If you were looking to build an Adelaide-Darwin trunk line and make a bit of extra cash from customers along the way, I would say the important locations to consider are the towns along the Stuart Highway.

OneRail already has a radio/satellite communications network that is more than capable of handling their needs.

Where engagement with OneRail could be useful is for leasing an easement within their corridor for parts of the route where that is the best available option.

The project is looking at a hydrogen based power source for the cabinets required at 95 km length for the optical fibre.
bevans
Very impractical. The fuel storage would be a nightmare.

Solar charged batteries would be the way to go for powering the repeater stations. This is well proven technology that is used for, among other things, line side rail equipment in remote areas.

If you're nervous about solar, you could include a backup diesel generator capable of providing battery charging for a couple of days pending a maintenance crew swapping out the faulty solar charging equipment.
  bevans Site Admin

Location: Melbourne, Australia
A backup diesel generator would be needed for 56 locations on the route between Darwin and Adelaide.

Take a look at this idea

https://lavo.com.au/#prime

This is not a closed loop model but there are closed loop systems which I am exploring.
  lkernan Deputy Commissioner

Location: Melbourne
I’d consider providing IoT networks like Lora too.  In wide open spaces they’d get very long range and perfect for things like weather stations, gates, sensors, etc.
  GrahamH Chief Commissioner

Location: At a terminal on the www.
The project is looking at a hydrogen based power source for the cabinets required at 95 km length for the optical fibre.
bevans
My experience in the 90s was that solar panels could climb down from their mounting frames and walk away never to be seen again. This really ruined system reliability at two sites. That was in settled areas of NSW. Hydrogen is probably less inclined to wander.

Brian, are you saying that a powered site is required every 95 Km Darwin to where ever in SA or that a 95Km section will be used as a feasibility project?
  justapassenger Minister for Railways

Hydrogen is probably less inclined to wander.
GrahamH
Hydrogen wanders through the walls of its own storage tanks.
  bevans Site Admin

Location: Melbourne, Australia
The project is looking at a hydrogen based power source for the cabinets required at 95 km length for the optical fibre.
My experience in the 90s was that solar panels could climb down from their mounting frames and walk away never to be seen again. This really ruined system reliability at two sites. That was in settled areas of NSW. Hydrogen is probably less inclined to wander.

Brian, are you saying that a powered site is required every 95 Km Darwin to where ever in SA or that a 95Km section will be used as a feasibility project?
GrahamH

In days gone long haul fibre systems a regeneration site was required between 90-120 kms apart on the cable.  The first fibre cable was built between Melbourne and Sydney (Fibre) and this was the case.

In these times there are no "regen" sites required and it is no longer a good idea to send power down a cable to sites either side of the power source.

It is still the case that on Single Mode Fibre G.652 there is a loss point and the signal (photons) need boosting.  it is the same for subsea cable systems.  Therefore a cabinet is required at around 95 kms to ensure the cable is optimal.

These days OLE (Optical Line Equipment) is required in the cabinet at that distance and these can be similar to the below.

https://www.infinera.com/products/infinera-flexible-grid-line-system-flexils

That equipment boosts the optical signal and also allows for breaking out of wavelengths.

The question really then becomes how do you power the cabinet?  Well this is where I am at.

DC power in the cabinet with DC bus with management control centrally for 48VDC. Maximium power draw is around 600W so AC would be required with a 1 RU mounted rectifier to keep power up and to keep the batteries charged.

The alternative to AC would be solar as you suggest.
  ANR Chief Commissioner

Why don't they just reinstate the OTL?
  justapassenger Minister for Railways

Why don't they just reinstate the OTL?
ANR
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  bevans Site Admin

Location: Melbourne, Australia
Why don't they just reinstate the OTL?
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justapassenger

Great in the day of non-digital asynchronous communications.  These days you can achieve with planning 800Gb/sec per fibre pair.

Interestingly when one takes the steamer from Port Augusta to Quorn the original makers of the OLT are still visible along some sections of the line.
  Graham4405 The Ghost of George Stephenson

Location: Dalby Qld
Interestingly when one takes the steamer from Port Augusta to Quorn the original makers of the OLT are still visible along some sections of the line.
bevans
Is that their carcasses or their ghosts? Wink
  Lockspike Chief Commissioner

Why don't they just reinstate the OTL?
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justapassenger
Maybe the people want more bandwidth, but politicians of a particular ilk were/are adamant that we don't need it, so the the OTL would do just fine
  bevans Site Admin

Location: Melbourne, Australia
Why don't they just reinstate the OTL?
.--. . --- .--. .-.. .  .-- .- -. -  -- --- .-. .  -... .- -. -.. .-- .. -.. - ....  - .... . ... .  -.. .- -.-- ...
Maybe the people want more bandwidth, but politicians of a particular ilk were/are adamant that we don't need it, so the the OTL would do just fine.
Lockspike

The amount of capacity (telecommunications transmission) required between Australia and Asia will grow by 8x between 2021 and 2027.

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