Topic '4 Bonded Upstream' in forum 'Time Warner Internet Services' - dslreports.com

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 21:23:41 EDT

horseshoe posted : Stop: I want your Upstream here in So Cal. Stop: I have the Doc 3 modem. Stop: Wait more time. Stop: TWC, want more $?
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 5 5120 Ksym/sec 30700000 Hz 36.9 dBmV
2 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 20:38:30 EDT

Suit Up posted : 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.

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 20:31:39 EDT

DrDrew posted :

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.

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 19:34:04 EDT

Suit Up posted : 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).

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 19:15:40 EDT

DrDrew posted : 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.

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 14:58:33 EDT

CptGemini posted : My guess would be that its a way to help distribute the bandwidth across the channels better so it don't hog up all bandwidth on those channels for D2/D1 modem users.
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»www.akaskriller.com - Your ultimate source for all android needs.

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 14:26:24 EDT

bluepoint posted : Wow kilrathi , it looks like you have wiring problem somewhere. I've seen around you've been on top of your problem and TWC hasn't solve the mystery?
AFAIC, we have a steady/stable connections, in fact, since I acquired the docsis 3 modem, the upstream power got better. When I had the docsis 2 modem(single channel), my upstream power would go from 46 to 55dBmV depending on the freq. The lower the frequency the higher the power. But now with the docsis 3 all 4 channels are about in low power ranges, and sometimes the lowest frequency registers with a better reading. I was told lower frequency uses higher power but now it seems not to support that theory. What do I know anyway? ;)
As to why we use 16QAM for the upstream, I want to know also. Maybe DrDrew can give some idea on these things.

Re: 4 Bonded Upstream

Sat, 18 Aug 2012 14:10:13 EDT

bluepoint posted : Suit Up I'm not knowledgeable enough to answer your question as to why TWC chooses those modulations but if you have time read some from »en.wikipedia.org/wiki/Quadrature···dulation I tried to understand what's written at wikipedia but it still doesn't register on this pea brain. :(
Or DrDrew or hobs can explain better.

Re: 4 Bonded Upstream

Fri, 17 Aug 2012 23:52:01 EDT

kilrathi posted : not sure but i have same combination and i am forced to use splitters so that the atdma channels t4 timeout and as soon as that happens i remove splitters and keeps connection working but this way i have no packet loss because in my area the atdma experience interference, the lines here are not ready for it and there is packet loss when I use them. I hope they all running good for you. Although in your case I noticed even atdma running at 16QAM, in my case they try to run 64QAM and it simply too much noise for it.

Re: 4 Bonded Upstream

Fri, 17 Aug 2012 23:46:51 EDT

Suit Up posted : Why is there a mixture of DOCSIS 1/TDMA and DOCSIS 2/ATDMA? Is there a technological advantage to that, or is it because the channels are shared with people who only have DOCSIS 1 modems?

Re: 4 Bonded Upstream

Fri, 17 Aug 2012 23:00:14 EDT

hobgoblin posted : Welcome to the party!

Hob

4 Bonded Upstream

Fri, 17 Aug 2012 22:12:50 EDT

bluepoint posted : Looks like our division is ready to boogie. :D

Upstream