bri5k
@charter.com
|  [cable] Low Bandwidth
I have 3Mb/s service from Charter. I'm renting a Motorola Surfboard SB4100 from them, which is connected to a DLink DI-524 wireless router.
Lately I've noticed web surfing getting noticeably slower. I came here and did a few speed tests, and I average 900 kb/s down. I tried the test on three different computers with the same result. For some reason, I thought to try powercycling the cable modem. Afterwards, I had speed tests of 2500 to 3000 kb/s (sometimes more), right where I'd expect them to be.
I've done this twice now on different days. The speed seems to hold up for awhile (days?), then drops down again.
Anyone have any thoughts on what is going on?
Thanks! |
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jamiers
join:2004-08-22
Ashford, CT | I had the same situation and they swapped out my modem for an ambit generic modem. Everything is fine now. |
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pbarrow
Premium
join:2003-09-16
Montgomery, AL
| reply to bri5k
I'm haing some similar type problems but it's my upload speeds that is the problem plus some modem disconnects every day or two.
And I think it's cable plant problems and intermittent noise.
I've been complaining for weeks and I'm trying to get a Coporate Escalation going since I'm not having much luck with the local people or the Plant Manager so far.
Most every tech I talk to here and a Tech Support Supervisor I talked to a couple hours ago about my disconnect then (who said he saw signal fluctuations in their logs) has said that my Upstream Pwr should not be jumping from like 41 to 48 to 50 and back and forth at times.
I personally think there is an Amplifier in my cable plant someplace that has a flaky Upstream channel since when I do lose connection and the mode cycles and tires to connect it does acquire the downstream but not the upstream and just keep cycling until it finally does connect.
Intermittent noise can affect your speeds.
Check your modem logs for No Ranging Response - T3 Timeout
a sure sign of noise or connection problems in the cable plant.
These are the kinds of log entries I get during the connection loss.
2008-02-09 17:38:00 3-Critical R02.0 No Ranging Response received - T3 time-out
2008-02-09 17:37:57 5-Warning SYNC: US Gain in cache is invalid: 0.00
2008-02-09 17:37:57 7-Information Starting Ranging On Channel 4
2008-02-09 17:37:53 7-Information Downstream Locked - Collecting Upstream Information
2008-02-09 17:37:50 7-Information Scanning frequency 597000000Hz
2008-02-09 17:37:50 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2008-02-09 17:37:50 7-Information Scanning frequency 591000000Hz
2008-02-09 17:37:50 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:49 7-Information Scanning frequency 585000000Hz
2008-02-09 17:37:49 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:48 7-Information Scanning frequency 579000000Hz
2008-02-09 17:37:48 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:47 7-Information Scanning frequency 573000000Hz
2008-02-09 17:37:47 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:46 7-Information Scanning frequency 567000000Hz
2008-02-09 17:37:46 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:45 7-Information Scanning frequency 561000000Hz
2008-02-09 17:37:45 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:44 7-Information Scanning frequency 555000000Hz
2008-02-09 17:37:44 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:43 7-Information Scanning frequency 549000000Hz
2008-02-09 17:37:43 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:42 7-Information Scanning frequency 543000000Hz
2008-02-09 17:37:39 3-Critical T04.0 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
2008-02-09 17:37:39 4-Error SYNC: Hardware didn't detect SYNC msg for 600ms during Initial Ranging
2008-02-09 17:37:39 7-Information Scanning frequency 501000000Hz
2008-02-09 17:37:39 3-Critical T01.0 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2008-02-09 17:37:38 7-Information Scanning frequency 603000000Hz
2008-02-09 17:37:38 3-Critical U02.0 UCD invalid or channel unusable
2008-02-09 17:37:38 3-Critical R03.0 Ranging Request Retries exhausted
2008-02-09 17:37:36 3-Critical R02.0 No Ranging Response received - T3 time-out
2008-02-09 17:36:59 5-Warning SYNC: US Gain in cache is invalid: 0.00
2008-02-09 17:36:58 7-Information Starting Ranging On Channel 2
2008-02-09 17:36:58 3-Critical R03.0 Ranging Request Retries exhausted
2008-02-09 17:36:55 3-Critical R02.0 No Ranging Response received - T3 time-out
2008-02-09 17:36:20 5-Warning SYNC: US Gain in cache is invalid: 0.00
2008-02-09 17:36:19 7-Information Starting Ranging On Channel 1
2008-02-09 17:36:19 3-Critical R03.0 Ranging Request Retries exhausted
2008-02-09 17:36:19 3-Critical R02.0 No Ranging Response received - T3 time-out
2008-02-09 17:35:42 5-Warning SYNC: US Gain in cache is invalid: 0.00
2008-02-09 17:35:41 7-Information Starting Ranging On Channel 4
2008-02-09 17:35:41 3-Critical R03.0 Ranging Request Retries exhausted
2008-02-09 17:35:40 3-Critical R02.0 No Ranging Response received - T3 time-out
2008-02-09 17:35:02 7-Information Starting Ranging On Channel 3
2008-02-09 17:34:58 7-Information Downstream Locked - Collecting Upstream Information
2008-02-09 17:34:56 7-Information Scanning frequency 597000000Hz
2008-02-09 17:34:56 7-Information Trying to synchronize ...
2008-02-09 17:34:56 7-Information Synchronization LOST
2008-02-09 17:34:56 3-Critical R03.0 Ranging Requests Retries exhausted
2008-02-09 17:34:55 3-Critical R02.0 No Ranging Response received - T3 time-out |
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bri5k
@charter.com
| Thanks for the pointer... I didn't know I could check the log for the modem.
When the modem, it seems to be having trouble downloading the cable modem configuration file ("Invalid Type"). Is this how it should go for Charter, or not?
080209112241 7-Information F502.1 Bridge Forwarding Enabled.
080209112241 7-Information F502.3 Bridge Learning Enabled.
080209112241 7-Information B518.0 Baseline Privacy is skipped
080209112240 7-Information I500.0 Registration Completed
080209112240 7-Information I0.0 REG-RSP Registration Response
080209112240 7-Information I0.0 REG-REQ Registration Request
080209112240 7-Information D509.0 Retrieved TFTP Config File SUCCESS
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 7-Information D507.0 Retrieved Time....... SUCCESS
************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS
************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1
************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day
************ 7-Information T500.0 Acquired Upstream .......... SUCCESS
************ 8-Debug T503.1 Acquire US with status OK, powerLevel 40, tempSid 104
************ 8-Debug T505.0 Acquired Upstream with status OK
************ 7-Information T501.0 Acquired Downstream (687000000 Hz)........ SUCCESS
************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 687000000, US Id 3
************ 7-Information I510.0 *** BOOTING *** SB4100-0.4.5.0-SCM00-NOSH |
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cork1958
Cork
join:2000-02-26
Fruitport, MI
 ·Charter Pipeline
| reply to bri5k
They still have the 3Mb in your area? Call and see if you can the "free" upgrade to 5/512.
Any quick power outages in your area lately causing the the modem/router to go off/on and lose sync, which a reboot of those would fix?
--
The Firefox alternative.
»www.mozilla.org/projects/seamonkey/ |
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bri5k
@charter.com | Yeah, last I checked they still had 3 Mb but its looking like that might be dropped in the near future.
No, haven't had any power outages here in awhile. |
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stivvy
Technonerd
join:2002-05-08
| reply to bri5k
said by bri5k :
Thanks for the pointer... I didn't know I could check the log for the modem.
When the modem, it seems to be having trouble downloading the cable modem configuration file ("Invalid Type"). Is this how it should go for Charter, or not?
080209112241 7-Information F502.1 Bridge Forwarding Enabled.
080209112241 7-Information F502.3 Bridge Learning Enabled.
080209112241 7-Information B518.0 Baseline Privacy is skipped
080209112240 7-Information I500.0 Registration Completed
080209112240 7-Information I0.0 REG-RSP Registration Response
080209112240 7-Information I0.0 REG-REQ Registration Request
080209112240 7-Information D509.0 Retrieved TFTP Config File SUCCESS
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 4-Error D503.0 TFTP, Invalid type, CONTINUE
080209112240 7-Information D507.0 Retrieved Time....... SUCCESS
************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS
************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1
************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day
************ 7-Information T500.0 Acquired Upstream .......... SUCCESS
************ 8-Debug T503.1 Acquire US with status OK, powerLevel 40, tempSid 104
************ 8-Debug T505.0 Acquired Upstream with status OK
************ 7-Information T501.0 Acquired Downstream (687000000 Hz)........ SUCCESS
************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 687000000, US Id 3
************ 7-Information I510.0 *** BOOTING *** SB4100-0.4.5.0-SCM00-NOSH
What you are seeing is not the download of the configuration file, but the time of day. This would not affect your bandwidth.
Could you post your signal levels from the modem? |
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CBN Tech
Premium
join:2006-11-10
Louisville, KY
·Insight Communicat..
| reply to bri5k
Try Hooking your PC directly to the modem (without your router) and see if the speed still declines the same as it does when your router is hooked up.
I'm not accusing your router but I had a DI-524 a few years ago and I know how old they are.
--
CBN TECH |
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bri5k
@charter.com
| reply to stivvy
Here's the info from the modem:
Downstream Value
Frequency 687000000 Hz Locked
Signal to Noise Ratio 37 dB
QAM 256
Network Access Control Object ON
Power Level -4 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
HFC MAC Address 00:20:40:A6:8E:30
Upstream Value
Channel ID 3
Frequency 21999868 Hz Ranged
Ranging Service ID 104
Symbol Rate 2.560 Msym/s
Power Level 39 dBmV |
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stivvy
Technonerd
join:2002-05-08
| Signal levels at least look OK. CBN tech already gave the next step in the troubleshooting, run a direct connection from your modem to one PC and test again (don't forget to power-cycle the modem).
Thos DI-524 aren't just old, they also can cause some issues with VPN connections because the firmware doesn't support some configurations. |
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