MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN
 ·Comcast
| My ARRIS 502g won't do DOCSIS 2.0
Just to jot down my saga "In Search of the Elusive DOCSIS 2 Upstream Upgrade"
I have been going round and round with CC support since the June announcement of the upload upgrade. I have monitored my Arris 502g and have restarted it few days. Still, my upstream is Docsis 1.x and my uploads are 1Mbps'ish.
So I finally got a tech who didnt try to tell me "upto's" and "DOCSIS 3 is on the way, you must be mistaken about any upload upgrades" and offered to help. First, he verified my account is set for the DOCSIS 2.0 upgrade. He then acknowledged that the Arris reporting upstream 1.x will limit me ever getting sustained 2Mbps uploads. He even went so far as to 'clear' the Arris so it would behave as it would out of the box... to no avail, Docsis 1.x
They are supposed to come out today to swap out the Arris I will keep you posted on my results. Reading and seeing Dadkin's Arris at DOCSIS 2.0 just pushed me that extra step to getting it resolved to MY satisfaction... after all, I have been paying $166.00 a month for several years, why can't I have it my way at least ONCE 
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wenter99
Alpha Male
Premium
join:2003-12-09
Albuquerque, NM
 ·Comcast Digital Vo..
 ·T-Mobile US
·Comcast
| Hmmm... I have had that same modem since July. Do you have the same firmware version as this:
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yurkinator
join:2007-07-30
Newark, DE | As far as I know docsis 2.0 is not going to affect your upload speed. You should be checking to make sure you have the correct config file. What tier do you subscribe to? |
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MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN | reply to wenter99
Just going from memory it looks to be the same. |
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MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN
·Comcast
| reply to yurkinator
based on the graph posted in the DOCSIS 2.0 Discussion , DOCSIS 1.x 2560kSym QAM 16 can only deliver 1Mbps which is what I am getting and is what the Arris is announcing is the upstream setting.
I do powerboost to 3.5Mbps upload but that is temporary. I am on the 8/2 package and I do receive the correct download speeds.
A buddy of mine just added CDV and received a Thomson TM, he gets a sustained 2200Kbps upload but it's status screen does not indicate DOCSIS ver. |
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plat2on1
join:2002-08-21
Hopewell Junction, NY
clubs: | reply to MemphisPCGuy
i'm confused why do you think you should be on docsis 2.0? |
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MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN
·Comcast
| said by plat2on1  :i'm confused why do you think you should be on docsis 2.0? To achieve a sustained 2Mbps upload speed. Per the graph outlined in the DOCSIS 2 stickied discussion, it has been pointed out that DOCSIS 1.x 2560KSym QAM16 (upstream) is only capable of 1Mbps.
Is everyone/anyone getting 2Mbps upload on DOCSIS 1.x ARRIS TM502g? Powerboosting 15 second tests don't count
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plat2on1
join:2002-08-21
Hopewell Junction, NY
clubs:
| said by MemphisPCGuy :said by plat2on1 :i'm confused why do you think you should be on docsis 2.0? To achieve a sustained 2Mbps upload speed. Per the graph outlined in the DOCSIS 2 stickied discussion, it has been pointed out that DOCSIS 1.x 2560KSym QAM16 (upstream) is only capable of 1Mbps. Is everyone/anyone getting 2Mbps upload on DOCSIS 1.x ARRIS TM502g? Powerboosting 15 second tests don't count 2meg upload has nothing to do with docsis 2.0/3.0. if you are on the 8/2 plan and aren't getting it then you have some other problem. |
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mike12806
Premium
join:2007-08-28
Milton, MA
·Comcast
3 edits | reply to MemphisPCGuy
I'm getting Docsis 2.0 on QAM16, and I get powerboosted upload speeds close to 7 Mb/s up, and around 2.3 Mb/s sustainted up!
Also, I did get 2 meg upload on the the Arris when I had the 8/2 plan, and that was on Docsis 1.x with QAM16, so you can get over 1 Mb/s upload without docsis 2.0....
I would say it's an issue with your config file....what do your signal levels look like? |
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MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN
·Comcast
| I am getting a sustained upload speed of 145KBs which converts to 1Mbps. The tech just left, no indication of problems but nothing has changed. I am still at DOCSIS 1.x 2560kSym QAM16 on upstream. That to me seems to be the limiting factor as Comcast Support claims the correct config file for 8/2 is being pushed to the modem.
I just called Comcast support and they suggest I just get a seperate cablemodem.
What else can I do to try to get the Arris to give me the 2Mbps upload I'm supposed to get? As I FTP website changes and game for the most part upload is more important to me than mega downlaod speeds... I'd just like to get it where it's supposed to be
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mike12806
Premium
join:2007-08-28
Milton, MA
·Comcast
| Once again, you can have Docsis 1.x QAM 16 upstream and still get the 2 Mb/s upload.....that's neither here nor there though.
Someone correct me if i'm wrong, but if your signal levels are lousy, or there are problems in the plant, will the modem knock itself down to Docsis 1.x?
Can the OP post his signal levels? |
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MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN
·Comcast
1 edit | said by mike12806 :Once again, you can have Docsis 1.x QAM 16 upstream and still get the 2 Mb/s upload.....that's neither here nor there though. Someone correct me if i'm wrong, but if your signal levels are lousy, or there are problems in the plant, will the modem knock itself down to Docsis 1.x? Can the OP post his signal levels? I am not at the modem now, but I want to say my Downstream is +6dBmv and my Upstream is +40dBmv - I'll update that when I get back home if incorrect.
The only reason I latched on the DOCSIS 1.x vs 2.0 is that is the only indicator (besides the actual upload speed which Comcast will not accept as an indicator) i could latch my wagon on to |
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jahoneycutt
@comcast.net
| reply to MemphisPCGuy
If you have cables picking up noise your house usually caused by Twist or incorrectly Crimp on fittings, if the cable was stapled in the walls crushing it, run under carpets crushing it, poorly made cable with gold ends (radio-shack, monster pre-made cables....), poorly shielded, push on cable jumpers, GOLD plated splitters!, or your NODE(your RF service area) your up load will be slow, if your return level are out of range you up load will be slow, if your router can not pas the information you could be bottle necke.
how is your modem wired from the ground block, was a DC used or is it on a splitter? the lower you can get your return level the better, but if your tap is only one or 2 taps from the last amp, it will always have a return level on the high end.
my router is bottle necked at 6meg, no power boost for me. how ever if i hook strait to a pc i get full 12meg power boost. |
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DarkLogix
join:2008-10-23
Baytown, TX
·Comcast Workplace
·Comcast
2 edits | reply to mike12806
As he is memtioning 2650 symbol rate and you have 5120 symbol rate yours is infact at a better modulation
the higher the symbol rate the wider the band = more available
and heres the graph
someone here has a referance on symbol rate to Mhz conversion |
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MemphisPCGuy
Senior Systems Engineer
Premium
join:2004-05-09
Memphis, TN
·Comcast
| reply to jahoneycutt
said by jahoneycutt :
If you have cables picking up noise your house usually caused by Twist or incorrectly Crimp on fittings, ..... The fact my upload speed is exactly limited to 1Mbps seems to suggest the problem is in configuration. If the issue is caused by something you suggest it would tend to be sporadic. |
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DarkLogix
join:2008-10-23
Baytown, TX
·Comcast Workplace
·Comcast
| said by MemphisPCGuy :said by jahoneycutt :
If you have cables picking up noise your house usually caused by Twist or incorrectly Crimp on fittings, ..... The fact my upload speed is exactly limited to 1Mbps seems to suggest the problem is in configuration. If the issue is caused by something you suggest it would tend to be sporadic. it seems liely that your are on the D1.1 16qam 1.6MHz channel which has a capacity of 5Mbit shared by everyone on your channel |
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EG
The wings of love
Premium
join:2006-11-18
Union, NJ
| reply to DarkLogix
said by DarkLogix :the higher the symbol rate the wider the band = more available W.I.W., my understanding is that a higher "symbol rate" doesn't change the *actual* width of an existing channel. It is a set figure that reflects the data rate of said channel depending on the modulation rate and actual channel width. |
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netcool
Premium
join:2008-11-05
Englewood, CO | reply to DarkLogix
Comcast doesn't use 1.6MHz channel widths anywhere to my knowledge. |
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netcool
Premium
join:2008-11-05
Englewood, CO
| reply to MemphisPCGuy
said by MemphisPCGuy :The fact my upload speed is exactly limited to 1Mbps seems to suggest the problem is in configuration. If the issue is caused by something you suggest it would tend to be sporadic. It's possible your CMTS has not been upgraded to DOCSIS 2.0 upstreams as well. The South has been a bit slower than other divisions to deploy DOCSIS 2.0
If you'd like you can PM your MAC address and I'll look at the CMTS. |
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ffblackie
You called 911 for this?
Premium
join:2002-01-13
Knoxville, TN
·Comcast
| reply to MemphisPCGuy
So this means that my eMTA is also stuck in 1.X?
What do I have to do to get this upgraded?
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