Why is this solution not being implemented in SA ?
There are two type of fibre network:
Active and Passive / PON.
There aren't many active home networks. The majority are PON. Vuma is the exception to this rule in some areas. SADV and Teralink also have active networks in some areas.
Most business networks are active.
You can tag vlans on switch ports of active networks.
For example. Open Access ISP vlan number is 1234.
@MidnightWizard if you know your way around Cisco, this should hopefully make sense.
The vlan is tagged on the ISP NAS, the ISP core router and any other routers and switches between the ISP and the open access network. Then it's also tagged on the open access network right op to the port on the switch that the client will connect to. The client places his or her PPPOE details, or DHCP client on the bare metal of the SFP ethernet port of the router.
Happy days.
With PON, the whole thing changes. There's no physical port that the client ONU / ONT plugs into. It just connects to the passive fibre network. Therefore the open access ISP vlan must be tagged on the WAN port of the ONU / ONT and the network owner needs some kind of MAC authorisation to ensure some other ONU isn't plugged into their network.
Cost of delivering the service also comes into play.
In a business park, you can put down a couple of 48 port switches and run 96 or 144 fibres to patch enclosures and then onto clients as needed, as you will recover the money from the business clients.
You can't do that in a domestic environment. Uptake is too low as people often don't have money for perceived luxuries like fibre internet, or they are tied into long contracts with ADSL or wireless service providers. Add to that churn. This year we've lost more than 100 ONUs, where people have just packed their bags and left in the night. Hence domestic networks are normally PON.
I work with both technologies on a daily basis. Both on networks that we own and networks that we resell service on. Active is just so much better.
If I had a choice between an active network like De Velde where SADV terminate the service on a CAT5 cable in the flat, or a PON network where I plug into a Calix ONU, I'd take active every time.
My two cents.