nbn™ technology 101: What is FTTN?
Fibre-to-the-Node is a comparatively newer Fixed Line nbn™ network connection technology. Here’s how it works.
The nbn™ network is comprised of multiple technologies across Fixed Line (FL), Fixed Wireless, and satellite connections.
Of the FL connections, Fibre-to-the-Node (FTTN) is one of the four current technology types of the nbn™ Multi Technology Mix, alongside Fibre-to-the-Premises (FTTP), Fibre-to-the-Basement (FTTB), and Hybrid Fibre Coaxial (HFC).
Let’s break down the ins and outs of FTTN, which plays a big part in our target of connecting 8 million Australian homes to services over the nbn™ network by 2020.
We anticipate that around 40 per cent of all premises on services over the nbn™ network will be connected via FTTN or FTTB technologies.
What is FTTN?
FTTN involves nbn connecting fibre to purpose-built street cabinets (or ‘nodes’). These nodes are then connected to individual premises via existing copper lines.
For ready-for-service (RFS) areas where FTTN is or will be available by 2020, nbn should be able to connect easily and quickly to end-user premises that already have existing landline phone lines or fixed-line broadband services.
This may sound similar to an existing broadband technology, ADSL, but FTTN is actually different.
For ADSL connections, the average length of copper lines serving an end-user premises is around 2km. For FTTN, nbn will reduce that average copper-line cable length to 450 metres. Roughly two-thirds of end users will be within 400 metres of the nearest FTTN cabinet.
There has been significant discussion in the public sphere about FTTN vs FTTC (Fibre-to-the-Curb), FTTP and other network technologies.
We’ve covered this previously for both FTTP and FTTC, but it’s worth going over again.
When nbn first planned the network, future high-speed technologies such as FTTC didn’t exist commercially.
Despite the excitement surrounding FTTC technology, which is expected to launch in 2018, we can’t easily halt 18 months of designing, planning, and construction work that’s already in the pipeline for FTTN deployment to several million homes.
The other challenge of FTTC is that nbn is a world leader in using this type of technology, meaning much of the testing, as well as research and development, falls on our shoulders.
FTTN also allows us to provide fast internet connections to Australians sooner than Fibre-to-the-Premises (FTTP) connections.
In fact, the cost of driving fibre between the distribution pit outside a premises and the premises itself has been estimated to be roughly 25% to 30% of an FTTP build. This is a huge investment in time and money for a relatively small bit of fibre.
The reality is that deploying FTTP to every home was extremely expensive, complicated and, ultimately, taking too long.
FTTN, on the other hand, is around four times faster to get to market as it’s able to reuse existing copper lines.
In short, the major benefits of FTTN are that it’s a faster to roll out and a more cost-effective connection technology that also allows potential upgrade paths for higher speeds in the future, as required.
FTTN vs ADSL
Due to relying on existing copper wires, FTTN is sometimes confused with ADSL or ADSL2+, but it is a different technology solution.
FTTN uses Very High-Speed Digital Subscriber Line (VDSL) technology, which is a newer and faster version of Asymmetric Digital Subscriber Line (ADSL) and its successor ADSL2+.
VDSL is now in its second form, VDSL2, and has also benefited from a process called ‘vectoring’.
Vectoring works in a similar way to noise-cancelling headphones, eliminating the interfering signal noise (crosstalk) between the different lines in copper connections.
In practical terms, VDSL2 with vectoring allows for fast download and upload speeds, thanks to this interference cancellation.
The future of FTTN
As part of the nbn™ network rollout, FTTN connections could be upgraded to G.fast technology.
During nbn’s initial G.fast trials, we reached trial wholesale speeds over 600Mbp/s on 100 metre copper lines that were older than 20 years.*
To upgrade an FTTN (or FTTC or FTTB) premises to G.fast, all that should be needed on the end user’s side of things is a new modem. There should be no need to enter the premises and install new equipment.
Easy to use
Another perk of an FTTN connection is the ease of installation compared with other technologies.
An end user’s preferred RSP will generally provide a modem for FTTN connections.
Alternatively, an end user can use their own modem, as long as it’s an approved VDSL2 compatible unit.
This should mean that, under normal circumstances, there would be no requirement for an end user to wait for an approved installer to physically install the relevant nbn™ network hardware on or in their premises once an area is ready for service (RFS) and the end user has ordered a service over the nbn™ network via an RSP.
There are times when an engineer may need to enter a premises, but this is the exception, rather than the rule.
End users can check their address on the nbn™ website to determine whether the nbn™ network is RFS in their area, or at which point during the nbn™ network rollout it may be available.
Check your address to see if you can connect to the nbn™ network.
* nbn provides services to its wholesale customers, telephone and internet service providers, and does not provide services directly to end users. These speeds were achieved by end users in the context of a trial and are not necessarily reflective of the speeds that will be experienced by end users. End user experience including the speeds actually achieved over the nbn™ network depends on the technology over which services are delivered to their premises and some factors outside our control like equipment quality, software, broadband plans, signal reception and how the end user’s service provider designs its network.
Last updated on 14 June 2017