What is G.Fast?
G.Fast is a variant of DSL offering new ultrafast speeds.
- G stands for ITU-T Recommendations G.9700 and G.9701
- FAST is an acronym of Fast Access to Subscriber Terminals
- The G.fast technology works in a roughly similar way to the existing VDSL2 based Fibre-to-the-Cabinet (FTTC) service.
- Essentially a fibre optic cable is run to your local PCP Street Cabinet, which is then fitted with an extension “pod” (on the side of a cabinet) that houses the G.fast line cards (this can handle up to 48 ports, but it should eventually manage 96).
- After that, the G.fast service reaches your home via the existing copper line.
- In theory, G.Fast can achieve up to 1Gbps speeds dependent on copper length – However, Openreach are currently ONLY pitching the upto 160mb or 330mb variants.
- G.Fast is able to achieve these speeds by using a much increased frequency range than traditional VDSL.
How fast is G.Fast?
The speed you will receive over G/.Fast typically depends on the same variables as any other xDSL
service.These being line length, line material, line quality, interference, internal setup/wiring, CPE being used.
Please note – Real life lines are unlikely to match these speeds as there are far more variables and restrictions.
<100m - 900-1000Mbit/s
100m - 900Mbit/s
200m - 600Mbit/s
300m - 300Mbit/s
500m - 100Mbit/s
Openreach provide G.Fast as an Engineer installed service
- An engineer visit to the local street cabinet is required for all new installations of G.Fast
- The engineer will visit the customer’s premises to undertake wiring optimisation and modem/router installation
- The engineer will usually call the customer prior to starting work at the Street Cabinet (however this is not guaranteed). Work will usually not commence unless the customer has confirmed their availability.
- The engineer will install a G.Fast modem, NTE5c “Master Socket” if required and a G.Fast faceplate
- The engineer will assess the in home/office wiring and router location
- They will usually perform a speed test with all wirings and show this to the customer
Diagnostics and Testing
- The best way to think about G.Fast is that its just faster FTTC VDSL.
- The install and modem is managed. This means it is currently classed as Openreach equipment (warranty 12 months).
- It has all the same tests and tools that the FTTC estate has You would approach a potential G.Fast issue the same as you would approach an FTTC issue
- G.Fast is just FTTC with faster speeds
- The customers G.Fast Modem is installed by Openreach and covered for any faults by them.
- All diagnostics for FTTC are applicable for G.Fast other than alternate modem
- Speeds are upto 160Mb or 330Mb