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DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:16
reply to bluepoint

Re: 4 Bonded Upstream

16QAM is used for better noise handling... it can get away with SNR being 6dB (4x) lower than QAM64. The trade off is it has 2/3s the bandwidth per hz.

DOCSIS 1 channels are used for legacy devices... like some older ADSG cable boxes and power supply status monitoring.
--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.


Suit Up

join:2003-07-21
Los Angeles, CA
Ah. Thanks for the info DrDrew. Funny you say DOCSIS 1 is for legacy devices, my DOCSIS 2.0 modem still uses a DOCSIS 1 upstream (although it did have DOCSIS 2.0 for a couple of days a week or 2 ago).


DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:16
said by Suit Up:

Ah. Thanks for the info DrDrew. Funny you say DOCSIS 1 is for legacy devices, my DOCSIS 2.0 modem still uses a DOCSIS 1 upstream (although it did have DOCSIS 2.0 for a couple of days a week or 2 ago).

DOCSIS 3 and 2 can still use DOCSIS 1 channels... why shouldn't they? It's all usable bandwidth.

It's just DOCSIS 1 devices can't use DOCSIS 2 channels. They're not able to tune to 6.4 Mhz wide channels or decode ABOVE 16QAM modulation.

If no DOCSIS 1 channels are available, a DOCSIS 1 device can't get online.
--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.


Suit Up

join:2003-07-21
Los Angeles, CA
Oh I understand all that, I just think it's amusing you used the term "legacy" when my modem (which I've had probably about 6 months now) is still using it.