EPS
join:2008-02-13
Hingham, MA | reply to espaeth
Re: doc S__T DOCSIS3 is supposed to include upstream channel bonding in its final incarnation, but that part of the standard has been delayed.
I think Comcast's current deployments are a non-standard pre-DOCSIS3 version that doesn't feature upstream channel bonding, and so can't provide anything faster- but the standard does include it. |
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 knightmbEverybody Lies
join:2003-12-01
Franklin, TN | said by EPS:DOCSIS3 is supposed to include upstream channel bonding in its final incarnation, but that part of the standard has been delayed. I think Comcast's current deployments are a non-standard pre-DOCSIS3 version that doesn't feature upstream channel bonding, and so can't provide anything faster- but the standard does include it. My connection will do 50 Mpbs D / 40 Mbps U on speed test (during non-peak hours of course), but I'm only suppose to be on the "16D/2U" tier. So in fairness to my neighborhood, I have my connection traffic shaped to what they say I'm suppose to have. The only thing is, the modem is only a DOCSIS2 setup (as far as they told me), so unless I have my versions mixed up, I don't think DOCSIS2 is suppose to be able to do 50 Mbps, but I can on speed test sites and my router bandwidth counter matches what I see in the speed during the test. I wonder if my modem is one of those "pre-DOCSIS3" types or not since the speed is well beyond what DOCSIS2 is suppose to be able to achieve?
Looking at the modem channel and frequency page, this shouldn't be able to hit these kind of speeds at these modulations right?
quote:
Downstream Frequency 693000000 Hz
Lock Status Locked
Modulation 256 QAM
Symbol Rate 5.360537 Msym/sec
Downstream Power 2.3 dBmV
SNR 41.118 dB
Upstream Channel
Upstream Frequency 34000000 Hz
Lock Status Locked
Modulation 16QAM
Symbol Rate 2560000 sym/sec
Upstream Power 47.2 dBmV
Channel ID 11
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| said by knightmb:Looking at the modem channel and frequency page, this shouldn't be able to hit these kind of speeds at these modulations right? Nope. In my experience, the most you can push through DOCSIS 2.0 running 256 QAM forward and a 64 QAM return is 35 Mbps down and around 28 Mbps up. I believe the spec is 38 Mbps down and 32 Mbps up, though I'm feeling too lazy to look it up.
To the best of my knowledge, no one is bonding upstreams outside of a lab yet. The good news is that this feature is software upgradeable (at least it's supposed to be with the Cisco gear we're using anyway). Once the final 3.0 spec is ratified and debugged, it should be fairly easy to deploy fast symmetric speeds... assuming your cable plant is clean enough to support it.
- Tate
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Happiness is an OC-768 in your basement... |
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 dvd536as Mr. Pink as they comePremium
join:2001-04-27
Phoenix, AZ
kudos:4 | reply to EPS
said by EPS:DOCSIS3 is supposed to include upstream channel bonding in its final incarnation, but that part of the standard has been delayed. I think Comcast's current deployments are a non-standard pre-DOCSIS3 version that doesn't feature upstream channel bonding, and so can't provide anything faster- but the standard does include it. Well probably comcast has no plans to offer more than 5 up anyway so they don't need final D3 gear.
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When I gez aju zavateh na nalechoo more new yonooz tonigh molinigh - Ken Lee |
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 tp0dyabbazooiePremium
join:2001-02-13
Carnegie, PA
kudos:2
1 edit | reply to knightmb
said by knightmb:said by EPS:DOCSIS3 is supposed to include upstream channel bonding in its final incarnation, but that part of the standard has been delayed. I think Comcast's current deployments are a non-standard pre-DOCSIS3 version that doesn't feature upstream channel bonding, and so can't provide anything faster- but the standard does include it. My connection will do 50 Mpbs D / 40 Mbps U on speed test (during non-peak hours of course), but I'm only suppose to be on the "16D/2U" tier. So in fairness to my neighborhood, I have my connection traffic shaped to what they say I'm suppose to have. The only thing is, the modem is only a DOCSIS2 setup (as far as they told me), so unless I have my versions mixed up, I don't think DOCSIS2 is suppose to be able to do 50 Mbps, but I can on speed test sites and my router bandwidth counter matches what I see in the speed during the test. I wonder if my modem is one of those "pre-DOCSIS3" types or not since the speed is well beyond what DOCSIS2 is suppose to be able to achieve? Looking at the modem channel and frequency page, this shouldn't be able to hit these kind of speeds at these modulations right? Dude... Speed tests are never to be trusted. Particularly with the boost techniques being used. Only way to be sure is to find a good fast torrent with lots of seeds, or a nice fast, close webserver on a non-peak.
just my opinion..
-j
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if it aint broke, tweak it!!
currently on FiOS (kick aZZ!) |
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| reply to EPS
said by EPS:DOCSIS3 is supposed to include upstream channel bonding in its final incarnation, but that part of the standard has been delayed. I think Comcast's current deployments are a non-standard pre-DOCSIS3 version that doesn't feature upstream channel bonding, and so can't provide anything faster- but the standard does include it. So docsis 3 & windows vista have something in common... |
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 a333A hot cup of integrals please
join:2007-06-12
Rego Park, NY | LAWLZZ!!!!!!!!! that was a good one!!! |
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