[Ignitionnet]

Originally Posted by ccarmock

Is the relevence of DOCSIS of any form purely on the final leg of the network anyway - ie between the UBR & the subscribers modem?

Yep between CMTS / uBR and modem.

There is also the core of the network which I assume with be ethernet based and then peering with other providers.

If VM don't invest in those areas as well then all we will see is that the technology between the UBR and the subscriber will improve but the rest of the network will not without further investment.

Yes but this is the much cheaper bit. The cost of the last mile is several orders of magnitude higher.

Now I knwo the UBR isn't actually in the green box - so I assume each green box aggregates back to a single UBR port somewhere? Or does each piece of Coax to a home connect to a seperate UBR port?

Each piece of coax is aggregated at the nearest green box, from there it goes to x other green boxes where it's amplified and aggregated together and eventually it goes into a nodal cabinet where it's combined with other coax going into that cabinet. Each node is between 250 and 2500 homes passed by the network so potentially that is how many customers are sharing a uBR port.

Just to make it more complicated multiple nodes can share a single port, and to make it worse still you can supply more than one downstream to a single node.

http://en.wikipedia.org/wiki/Hybrid_fibre-coaxial

Are the UBRs local to the area they serve or all held in a few central locations?

Depends, they vary from local to 'regional'. For example Basingstoke is served by equipment in Reading and the Basingstoke hub just has optical repeaters which relay signals to and from Reading, while Horndean, a pretty small village in Hampshire, has its' own uBRs in its' own hubsite.

Does the roll out of DOCSIS 3 require new equipment in the local green boxes too or just at the UBR?

Depends on the area. Some areas will not have the required 'room' on the network for the extra 32MHz that DOCSIS 3 deployment requires. These areas will either have to wait for analogue to be switched off, or need network upgrade which will require work in the green boxes. Generally DOCSIS 3 will only need work at the headends / hubsites and the new equipment will be in the same racks as the legacy uBRs running alongside them.

Does DOCISIS 3 employ any more advanced security to try to eradicate those stealing bandwidth?

Yes, it has all the BPI+ features that DOCSIS 1.1 has along with some additional features. Attempting to steal bandwidth from a DOCSIS 3 network is several orders of magnitude harder than the legacy networks.

*phew*

Ah...

Originally Posted by deed02392

Yeah, I understand what DOCSIS3 is, I read all about it, but I saw you saying in another post that VM would never use it as the backbone, that's why I am confused. Forget I said anything :P

Nah the backbone will be SDH with n x 10Gbit Ethernet riding on it