Reviews:
 ·RoadRunner Cable
1 edit | upstream bonding in NYC Just notice my modem is now bonding upstream and down stream channels . I,m on ultimate service 50/5
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 80 315000000 Hz 3.3 dBmV 35.6 dB 2 0
2 Locked QAM256 77 297000000 Hz 4.0 dBmV 35.9 dB 5 0
3 Locked QAM256 78 303000000 Hz 3.8 dBmV 35.9 dB 8 0
4 Locked QAM256 79 309000000 Hz 3.5 dBmV 35.9 dB 1 0
5 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
6 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
7 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
8 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 30600000 Hz 43.2 dBmV
2 Locked TDMA 1 5120 Ksym/sec 19000000 Hz 43.2 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 23800000 Hz 43.2 dBmV
4 Locked TDMA 4 5120 Ksym/sec 38800000 Hz 43.2 dBmV
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 swintecPremium,VIP
join:2003-12-19
Alfred, ME
kudos:4
 ·RapidVPS
 ·Sprint Mobile Br..
 ·VoicePulse
·RoadRunner Cable
| Did you need to reboot your modem for it to show bonded channels? I am wondering if modems will just bond when told to without a restart or if a restart is needed.
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Usenet Block Accounts | Unlimited Accounts |
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| mine did the bonding without a reboot
the modem is motorola sbg 6580 |
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etaadmin
join:2002-01-17
Dallas, TX
kudos:1 | reply to mckenna797
What is going on with TWC? Are their executives and employees on steroids? I have never seen so much activity for a long time.
I'll have what they are having  |
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| reply to mckenna797
Hmmmm.... This is indeed good news! First we hear of this in Texas. Then we hear of this in NY. I wonder how long until other cities start to enjoy this Upstream bonding? Perhaps it will fix my issue! |
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 kilrathi
join:2005-04-22
Rockaway Park, NY | reply to mckenna797
Too bad I now have constant packet loss on the upstream. |
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| Yes and now too bad TW in NEO has a major outage right now... /o\ |
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| reply to mckenna797
maybe a sign we'll see more than 5mbit upload on the higher tiers soon! |
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etaadmin
join:2002-01-17
Dallas, TX
kudos:1 | reply to mckenna797
said by mckenna797:Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 30600000 Hz 43.2 dBmV
2 Locked TDMA 1 5120 Ksym/sec 19000000 Hz 43.2 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 23800000 Hz 43.2 dBmV
4 Locked TDMA 4 5120 Ksym/sec 38800000 Hz 43.2 dBmV
Another thing the symbol rate is 5120Ksym/sec in other modems I've seen is 2560Ksym/sec not only you modem is bonding upstream channels the symbol rate is higher.
A question for those who know: Is 5120Ksym/sec capable of 40.960Mbps on the upstream? Per channel? |
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thorin
join:2007-11-08
Liberty, MO | I believe at 5120 ksym/sec one can achieve a theoretic limit of 30.72 Mbits/sec per upstream. |
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 ds5v50
join:2003-01-22
Fremont, OH
·RoadRunner Cable
| reply to milkman82
said by milkman82:Hmmmm.... This is indeed good news! First we hear of this in Texas. Then we hear of this in NY. I wonder how long until other cities start to enjoy this Upstream bonding? Perhaps it will fix my issue!
And maybe all the advertisements for extreme in my area will be for real instead of a let down. I have had two appointments to have it hooked up and then they call and say it is not available after all.
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Fremont, Ohio Weather
»www.Fremont-OH-weather.com
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Reviews:
·Time Warner Cable
| reply to thorin
said by thorin:I believe at 5120 ksym/sec one can achieve a theoretic limit of 30.72 Mbits/sec per upstream.
that is at QAM64 (ATDMA) but two of the channels are QAM16 (TDMA) so technically they have about 100Mbits total on the upstream as the QAM64 (ATDMA) carriers have 30Mbits a piece and the QAM16 (TDMA) carriers have 20Mbits a piece. |
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etaadmin
join:2002-01-17
Dallas, TX
kudos:1 | reply to thorin
said by thorin:I believe at 5120 ksym/sec one can achieve a theoretic limit of 30.72 Mbits/sec per upstream.
Yes that sounds more like it, it depends on the bits per symbol. In QAM16... 4? QAM64... 6 or 8?
Edit: »volpefirm.com/docsis-101/docsis1···ream-rf/ |
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 DrDrewSo that others may surf.
join:2009-01-28
SoCal
kudos:8
1 edit | reply to etaadmin
said by etaadmin:Another thing the symbol rate is 5120Ksym/sec in other modems I've seen is 2560Ksym/sec not only you modem is bonding upstream channels the symbol rate is higher.
A question for those who know: Is 5120Ksym/sec capable of 40.960Mbps on the upstream? Per channel?
Not on a single channel, for that you'd need 256QAM upstream. 5120 ksym/sec at 64QAM upstream only nets about 30 mbps.
This chart I made might help:
Basically you multiply the bits per symbol (controlled by the modulation type) x the symbol rate (controlled by the channel width).
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If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes. |
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| reply to mckenna797
Where in Astoria are you getting uplink bonding? I'm 34th st and Ast blvd, no dice... |
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etaadmin
join:2002-01-17
Dallas, TX
kudos:1 | reply to DrDrew
said by DrDrew:This chart I made might help:
[att=1]
Basically you multiply the bits per symbol (controlled by the modulation type) x the symbol rate (controlled by the channel width).
Thanks!
Never seen that chart... I'll keep it handy |
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kilrathi
join:2005-04-22
Rockaway Park, NY | reply to mckenna797
I think upstream itself is not ready for all the channel bonding in nyc because ever since it kicked in i have terrible packet loss problem on the upstream at peak usage times. I really hate when they chew more than they can swallow. |
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| reply to motorola870
QAM16 |
said by motorola870:said by thorin:I believe at 5120 ksym/sec one can achieve a theoretic limit of 30.72 Mbits/sec per upstream.
that is at QAM64 (ATDMA) but two of the channels are QAM16 (TDMA) so technically they have about 100Mbits total on the upstream as the QAM64 (ATDMA) carriers have 30Mbits a piece and the QAM16 (TDMA) carriers have 20Mbits a piece. No, not all ATDMA channels are QAM64. See pic it's in QAM16. |
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 djrobx
join:2000-05-31
Valencia, CA
kudos:1 | reply to mckenna797
It's annoying that the SBG6580 doesn't show the modulation for upstream channels.
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AT&T U-Hearse - RIP Unlimited Internet 1995-2011
Rethink Billable.
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DrDrewSo that others may surf.
join:2009-01-28
SoCal
kudos:8
1 edit | reply to mckenna797
said by mckenna797:Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 30600000 Hz 43.2 dBmV
2 Locked TDMA 1 5120 Ksym/sec 19000000 Hz 43.2 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 23800000 Hz 43.2 dBmV
4 Locked TDMA 4 5120 Ksym/sec 38800000 Hz 43.2 dBmV
Seems odd that ALL the channels are 6.4 Mhz (5120 Ksym/sec) wide...
I'd figure at least one channel would be left D1.1 compatible (3.2 Mhz or 2560 Ksym/sec) for legacy devices like OCAP boxes, eMTAs, and other status monitoring related devices. Maybe there is and it's just not part of the bonding group...
It's possible with all those upstream channels turned up, some odd upstream signal quality issues (like clipping) have cropped up and it what is causing the packet loss.
Could be modem firmware related too.... I've seen some posts in the Comcast forum that mentioned that.
Edit: Then again there is a 6.4 Mhz carrier centered on 19 Mhz (channel is from 15.8-22.2Mhz) and another 6.4 Mhz carrier centered on 23.8 Mhz (channel is from 20.6-27 Mhz). Those aren't 6.4 Mhz apart, so some overlap would seem to be occurring. A 2.4 Mhz overlap between channels isn't good as far as I know. Could be firmware bug causing the channels to display incorrectly if there aren't any connection problems...
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If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes. |
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