| [Connectivity] My upload speed sucks (54kbps) - any ideas? The reason I am posting this is that I have noticed that the quality of my calls on VoIP is poor (I can hear fine, but my callers get static-like noise on the line). I'm guessing this is due to the horrible upload speed. I saw this post which is implying there is a problem in SF
»Upload Speed Drops to 100kbps!!
Can anyone help?
Signal Numbers
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Frequency 705000000 Hz Locked
Signal to Noise Ratio 38 dB
Power Level -5 dB
Channel ID 4
Frequency 31984000 Hz Ranged
Power Level 49 dBmV
Line Loss Test
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»/quality/nil/1418290
Tweak Test
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All OK
Bandwidth Tests
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Speakeasy 3101 Kbps down, 177 kbps up - This is far higher than I have ever seen in a speed test before.
Megapath 3091 Kbps down, 91 kbps up
Linkline 3425 kbps down, 156 kbps up
Netaccess 1687 kbps down, 32 kbps up
PCPitstop Upload test - Upload Speed 128 Kb/s
Traceroute
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1 2 ms 6 ms 1 ms 192.168.123.254
2 10 ms 14 ms 8 ms 10.153.132.1
3 10 ms 10 ms 31 ms 12.244.24.145
4 11 ms 10 ms 9 ms 12.244.3.2
5 13 ms 14 ms 13 ms 12.127.33.21
6 13 ms 12 ms 12 ms gbr6-p30.sffca.ip.att.net [12.123.13.162]
7 14 ms 12 ms 20 ms tbr1-p013601.sffca.ip.att.net [12.122.11.77]
8 57 ms 55 ms 56 ms tbr1-cl1.cgcil.ip.att.net [12.122.10.5]
9 78 ms 75 ms 74 ms tbr1-cl1.n54ny.ip.att.net [12.122.10.1]
10 72 ms 76 ms 74 ms gbr2-p10.n54ny.ip.att.net [12.122.11.6]
11 75 ms 74 ms 73 ms gar1-p370.n54ny.ip.att.net [12.123.1.133]
12 74 ms 74 ms 74 ms mdf1-gsr12-2-pos-7-0.nyc3.attens.net [12.122.255
.162]
13 73 ms 71 ms 78 ms sccsbix12-1-4.attbi.com [63.240.64.46]
14 75 ms 78 ms 79 ms 192.168.201.12
15 75 ms 74 ms 75 ms www.comcast.net [63.240.76.72]
How many splitters are connected to the line, starting at the entry point to your dwelling and ending at the cable modem?
Not sure - If this is required I can get the info tomorrow - its a little dark down there at the moment.
Cable modem make & model - (ie. Motorola Surfboard 4200, RCA DCM236)
Motorola SB5100
Is your modem connected to your computer via a network card? or to a USB port?
Ethernet.
Are you using a router? If so, what make & model? - (ie. Linksys BEFSR11)
USR 8054 |
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 drakeOverdosed on confidencePremium,MVM
join:2002-06-10
Brooklyn, NY
kudos:5
 ·Verizon FiOS
| Everything looks good but there is a current firmware bug inside the SB5100 that affects the upstream speeds on some comcast systems, I suspect you are on one of those systems. I'd take a stroll down to my local Comcast Center and request for a SB5120 Cable Modem or any modem other than the SB5100.
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[OOL/CVC 9.45Mbps/985kbps CABLE $29.95 & TWC/Road Runner CABLE 2.95Mbps/369kbps Coax $44.95]::: Surf on Coaxial Cable! ::: |
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| Unfortuneatly I own the modem  - is there a firmware update? |
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drakeOverdosed on confidencePremium,MVM
join:2002-06-10
Brooklyn, NY
kudos:5 Reviews:
·Verizon FiOS
| said by jnurthen:
Unfortuneatly I own the modem - is there a firmware update?
At this time, No, You will need to replace the cable modem if you want your upstream speeds back.
How long have you been experiencing this issue?
--
[OOL/CVC 9.45Mbps/985kbps CABLE $29.95 & TWC/Road Runner CABLE 2.95Mbps/369kbps Coax $44.95]::: Surf on Coaxial Cable! ::: |
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| Since I got comcast in January - it never really bothered me - and I didn;t really begin testing and diagnosing it - until I switched to VoIP. |
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drakeOverdosed on confidencePremium,MVM
join:2002-06-10
Brooklyn, NY
kudos:5 Reviews:
·Verizon FiOS
| said by jnurthen:
Since I got comcast in January - it never really bothered me - and I didn;t really begin testing and diagnosing it - until I switched to VoIP.
Yup - Definitely the upstream bug, you need to replace the modem to obtain your upstream speeds again - Sorry. 
--
[OOL/CVC 9.45Mbps/985kbps CABLE $29.95 & TWC/Road Runner CABLE 2.95Mbps/369kbps Coax $44.95]::: Surf on Coaxial Cable! ::: |
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| Any recommendations on modems if I'm going to replace it? |
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drakeOverdosed on confidencePremium,MVM
join:2002-06-10
Brooklyn, NY
kudos:5 Reviews:
·Verizon FiOS
| said by jnurthen:
Any recommendations on modems if I'm going to replace it?
Any Terayon, Toshiba PCX2600 or another Surfboard cable modem - Older Model such as the SB4200.
--
[OOL/CVC 9.45Mbps/985kbps CABLE $29.95 & TWC/Road Runner CABLE 2.95Mbps/369kbps Coax $44.95]::: Surf on Coaxial Cable! ::: |
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| reply to jnurthen
You can check here for more information on VoIP.
»VOIP Tech Chat |
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josheg
join:2004-06-10
Nottingham, MD | reply to jnurthen
OMG you do not need a firmware update that is soo ludicrous! the first think i noticed is your power level being at -5dB comcast works at a minimum of -5dB to +5dB. 1st of all, if there is any firmware update that would affect the upload speed of the modem comcast would upgrade it. 2nd the upload and download speed on a docsis cable modem is controlled by a boot file given by comcasts TFTP server.
You need a service call!
Motorola SB5120 is a great modem. much better than any PCX modem.
trace route doesn't tell anything on your speed.
if your upload speed is continue to suffer after a service call, you need to let the call center know. so that they can run tests to find out which person on your node is running a server, and they are eating up your bandwidth.
Remember everyone comcast offers free service calls. so take advantage and get your system checked out.
contact me if you need any real advice |
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drakeOverdosed on confidencePremium,MVM
join:2002-06-10
Brooklyn, NY
kudos:5 Reviews:
·Verizon FiOS
| josheg  ,
Maybe you need to look into the Comcast Forum and look at the why the SB5100s are failing with their upstream channel, it's due to the firmware on the cable modem and it's on motorola fault not Comcast.
Acceptable Power Levels
Receive/Downstream: -15dbmV to +15dbmV
Transmit/Upstream: 30dbmV to 55dbmV
Signal to Noise Ratio(SNR): 30dB or Greater
-------------------------
jnurthen ,
There is no need for a service call, it's the cable modem itself, get a new cable modem and you should be fine. 
--
[OOL/CVC 9.45Mbps/985kbps CABLE $29.95 & TWC/Road Runner CABLE 2.95Mbps/369kbps Coax $44.95]::: Surf on Coaxial Cable! ::: |
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josheg
join:2004-06-10
Nottingham, MD | yea i look in the forum, and a little more than that, did you look at his upstream. call comcast now 1-888-comcast
ask them what the levels are for a cable modem -5dBmV to +5dBmV
every other signal level you posted are good.
i am not blaming on comcast trust me. his upstream power is too low, prob start causeing intermittent connection. i have seen no motorola modems needing to be upgraded, thinking that the 5120 is the newest mot single stream modem, comcast i gaurenntee you has upgraded the frimware.
call comcast. ask a CAE. -5 to +5
1-888-comcast
i know my spelling sucks, please excuse me |
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drakeOverdosed on confidencePremium,MVM
join:2002-06-10
Brooklyn, NY
kudos:5 Reviews:
·Verizon FiOS
| His signal levels are fine - There is no need for a service call AT ALL, it's the cable modem(firmware) affecting the upstream channel - If you don't trust the information I'm given, I think you should contact Qumahlin who works with Comcast and is a great tech.
--
[OOL/CVC 9.45Mbps/985kbps CABLE $29.95 & TWC/Road Runner CABLE 2.95Mbps/369kbps Coax $44.95]::: Surf on Coaxial Cable! ::: |
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josheg
join:2004-06-10
Nottingham, MD | yea well talk to me, what call center is he in, whats his extension, you dont know what i know. and by the way i doubt he is a tech, for comcast rules if you get on any forum even comcast's forum and you are not a moderator and you disclose that you are a comcast tech or CAE, then your opinions and views can be interpreted as comcast's view and you will get cought and comcast will fire you, trust me comcast keeps a eye on this forum and many others. they look for this. so if he really was a tech he wouldnt say so for his own job. and if he was one and not is any more. then the information that he is giving is the reason he is not working for comcast anymore. |
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 QumahlinNever Enough TimePremium,MVM
join:2001-10-05
united state | reply to josheg
said by josheg:
yea i look in the forum, and a little more than that, did you look at his upstream. call comcast now 1-888-comcast
ask them what the levels are for a cable modem -5dBmV to +5dBmV
every other signal level you posted are good.
i am not blaming on comcast trust me. his upstream power is too low, prob start causeing intermittent connection. i have seen no motorola modems needing to be upgraded, thinking that the 5120 is the newest mot single stream modem, comcast i gaurenntee you has upgraded the frimware.
call comcast. ask a CAE. -5 to +5
1-888-comcast
i know my spelling sucks, please excuse me
His signals are absolutely fine. To a CAE -5 through +5 will look fine to them...as would -8 to +8...and so and and so forth, it wouldn't be considered "fringe" until it reached into the double digits.
So you are wrong about that.
You also state "i have seen no motorola modems needing to be upgraded, thinking that the 5120 is the newest mot single stream modem, comcast i gaurenntee you has upgraded the frimware"
Seeing as the user is in an ex-att area I can 100% guarantee you his firmware has indeed NOT been upgraded.
Although I don't believe a firmware upgrade would help in this situation either.
I recommend having a tech out and doing a modem swap with the tech there and then doing a speed test to rule out the possibility of it being the modem.
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Forum Posts:4326 |
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josheg
join:2004-06-10
Nottingham, MD | reply to josheg
downstream -15 to +15
upstream -5 to +5
signal to noise should be at least 32 |
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QumahlinNever Enough TimePremium,MVM
join:2001-10-05
united state | said by josheg:
downstream -15 to +15
upstream -5 to +5
signal to noise should be at least 32
You are correct about downstream being -15 to +15
You are correct about SNR being better then 32 is optimal
You are 100% INCORRECT about upstream. Upstream should be optimally 30-55
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Forum Posts:4326 |
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josheg
join:2004-06-10
Nottingham, MD | reply to Qumahlin
to a CAE a -5 or below signal would be a immidiate service call. call 1888 comcast. if a CAE see's his modem when he calls in, he will send out a tech for signal, if the tech comes out and fixes the signal and still see's poor preformance then he will exchange the modem |
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josheg
join:2004-06-10
Nottingham, MD | the transmitt upstream power should be between 30-55 not the upstream receive power, which is the more important to a CAE when talking about a service call and the preformance of the modem |
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josheg
join:2004-06-10
Nottingham, MD | the upstream RECIEVE POWER IS -5 to +5
so i am 100% right about that. |
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