| reply to elios
Re: I am not the most up-to-date on upgrading UVerse if you think at&t and u-verse is dead in the water now... wait till cable gets their docsis 3.1 going in a year or 2. |
|
| said by Gib4500:if you think at&t and u-verse is dead in the water now... wait till cable gets their docsis 3.1 going in a year or 2.
DOCSIS 3.1 only increases the spectral efficiency by 50%. Speeds will be 1.5x what they are on DOCSIS 3.0, given the same frequency allocation. That's not revolutionary, merely evolutionary.
The real order-of-magnitude gains came from channel-bonding. And you can do that already on DOCSIS 3.0. Today, a cable company might bond 4 channels for 152 Mbps, or 8 channels for 304 Mbps. But there are over 150 channels on coax! |
|
|
|
| The Docsis 3.1 platform is aiming to support capacities of at least 10Gbit/s downstream and 1Gbit/s upstream. The new specs will do away with 6 MHz and 8 MHz wide channel spacing and instead use smaller (20KHz-to-50KHz-wide) orthogonal frequency division multiplexing (OFDM) subcarriers; these can be bonded inside a block spectrum that could end up being about 200 MHz wide.
»en.wikipedia.org/wiki/DOCSIS |
|
1 edit | said by Gib4500:The Docsis 3.1 platform is aiming to support capacities of at least 10Gbit/s downstream and 1Gbit/s upstream. You can already push about 6 Gbps over a 1 GHz cable plant. DOCSIS 3.0 gives you 38 Mbps of actual bandwidth per 6 MHz channel.
DOCSIS 3.1 gives you about 10 Gbps over the same 1 Ghz cable plant. That's a significant improvement, but not the game-changer that DOCSIS 3.0 was, with channel bonding.
It's essentially equivalent to a node split, except cheaper. You just mail modems to your customers, instead of stringing new fiber. That's why they're calling it 3.1 and not 4.0. It's evolutionary, not revolutionary. |
|
