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Topic: Cable Modem Question (Read 4119 times) previous topic - next topic
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Cable Modem Question

I just got a cable modem installed today. I noticed in the day time about once every 5 minutes I will loose the single and the ready lite on the modem will go from steady to blinking(in which when it is working it stays on steady). I can't surf the internet or stream music until it comes back on. But at night(like 2 in the morning) the signal is constant with no breaks. Does this mean that in the daytime there are to many people using the same bandwidth(since cable modem lines have to share)? Would I have this problem with DSL?
Cowon Iaudio X5 30 gig. It rocks!

Cable Modem Question

Reply #1 –
Check the Receive Power Level in the modem's diagnostic page (it should not be lower than –15dBmV). Mine is –16 at the moment, but the connection is stable. I don't know which modem you have, for the WebSTAR models the diagnostic page is at the address 192.168.100.1

If it's low (or the Transmit Power Level is greater than 58dBmV for QPSK) there is a problem with your instalation (splitters, badly fixed connectors etc.)

Take a look here for more info.

Cheers
If age or weaknes doe prohibyte bloudletting you must use boxing

Cable Modem Question

Reply #2 –
At around 12 noon today it happened again! I went through the whole night last night from 2 am(in which is when I woke up) onward and had no problems untill 12 noon. Would that be a sign that it's not hardware but to many people in the area useing cable modems?
Cowon Iaudio X5 30 gig. It rocks!

Cable Modem Question

Reply #3 –
Your CM is communicating with CMTS even when your PC is turned off. If there were too many people you would experience a bandwidth reduction, but not the connection break. (Although the noise level in the upstream channel would be much higher)

The temperature drift can cause the changes in signal quality, so it's all ok during the nite, but when when the sun warms up, your signal deteriorates.

File a complain to your provider and check how the things are in your neighbourhood.
If age or weaknes doe prohibyte bloudletting you must use boxing

Cable Modem Question

Reply #4 –
Here's the info:

Login

Factory default username/password is"user"
   
Cable Modem Information
Cable Modem : DOCSIS 1.0/1.1/2.0 Compliant
MAC Address : 00:19:7d:b4:40:0e
Serial Number : 00197DB4400E
Boot Code Version : 2.1.6d
Software Version : 2.93.1008
Hardware Version : 1.20

If the problem is temperature changes and the line, would I have this same problem with DSL?
Cowon Iaudio X5 30 gig. It rocks!

Cable Modem Question

Reply #5 –
Ok, you just need to find the page which displays the signal quality.

I think that you wouldn't experience this kind of problems with DSL.
If age or weaknes doe prohibyte bloudletting you must use boxing

Cable Modem Question

Reply #6 –
Quote from: darin on
At around 12 noon today it happened again! I went through the whole night last night from 2 am(in which is when I woke up) onward and had no problems untill 12 noon. Would that be a sign that it's not hardware but to many people in the area useing cable modems?


Well, I have no idea if this reflects on your problem at all, but we had a problem every day with our modem in the summer, it turned out to be equipment out on the street that was overheating and shutting down during the hottest part of the day.

The cable company finally replaced it. Then our modem had to be replaced (the situation improved, but did not completely resolve), and now we only get momentary interruptions during the day. Still, of course, annoying.
-----
J. D. (jj) Johnston

Cable Modem Question

Reply #7 –
Here's the other info:

Cable Modem Status
Item       Status       Comments
Acquire a Downstream Channel       555000000 Hz       Locked
Connectivity State       OK       Operational
Boot State       OK       Operational
Security       Enabled       BPI+

==============================================================
CABLE MODEM

•Information

•Status

•Downstream

•Upstream

•Upstream Burst

•Operation Config.

•Event Log
   
Cable Modem Downstream
Downstream Lock :    Locked
Downstream Channel Id :    4
Downstream Frequency :    
Downstream Modulation :    QAM256
Downstream Symbol Rate :    5360537
Downstream Interleave Depth :    32
Downstream Receive Power Level :    -7.2 dBmV
Downstream SNR :    37.9 dB

========================================================

Cable Modem Upstream
Upstream Lock :    Locked
Upstream Channel ID :    2
Upstream Frequency :    
Upstream Modulation :    QAM16
Upstream Symbol Rate :    2560 Ksym/sec
Upstream transmit Power Level :    48.3 dBmV
Upstream Mini-Slot Size :    2

========================================================
Cable Modem Upstream Burst


   

Req
   

Init Maint
   

Per Maint
   

Short Data
   

Long Data
   

(1)
   

(3)
   

(4)
   

(5)
   

(6)
Modulation Type    16QAM    16QAM    16QAM    16QAM    16QAM
Differential Encoding    Off    Off    Off    Off    Off
Preamble Length    64    128    128    128    128
Preamble Value Offset    576    640    640    640    640
FEC Error Correction (T)    0    5    5    4    9
FEC Codeword Information Bytes (k)    16    34    34    76    232
Scrambler Seed    338    338    338    338    338
Maximum Burst Size    0    0    0    7    137
Guard Time Size    22    48    48    22    22
Last Codeword Length    Fixed    Fixed    Fixed    Short    Short
Scrambler on/off    On    On    On    On    On
==================================================================   
Operation Config:

Network Access :    Allowed
Maximum Downstream Data Rate :    0
Maximum Upstream Data Rate :    0
Maximum Upstream Channel Burst :    0
Maximum Number of CPEs :    1
Modem Capability :    Concatenation Enabled, Fragametation Enabled, PHS Enabled

================================================================
Cable Modem Event Log:

Mon Jul 09 16:21:33 2007    Mon Jul 09 16:21:33 2007    1    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Mon Jul 09 14:18:11 2007    Mon Jul 09 14:18:11 2007    4    Critical (3)    82000200    No Ranging Response received - T3 time-out
Mon Jul 09 14:18:00 2007    Mon Jul 09 14:18:00 2007    397    Critical (3)    84000100    SYNC Timing Synchronization failure - Failed to acquire QAM/Q...
Mon Jul 09 14:17:05 2007    Mon Jul 09 14:17:05 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Mon Jul 09 14:18:02 2007    Mon Jul 09 14:18:02 2007    69    Critical (3)    84000200    SYNC Timing Synchronization failure - Failed to acquire FEC f...
Mon Jul 09 05:55:02 2007    Mon Jul 09 05:55:02 2007    5    Critical (3)    82000200    No Ranging Response received - T3 time-out
Mon Jul 09 05:54:48 2007    Mon Jul 09 05:54:48 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Mon Jul 09 05:54:16 2007    Mon Jul 09 05:54:16 2007    17    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Mon Jul 09 01:24:41 2007    Mon Jul 09 01:24:41 2007    5    Critical (3)    82000200    No Ranging Response received - T3 time-out
Mon Jul 09 01:24:30 2007    Mon Jul 09 01:24:30 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Mon Jul 09 01:23:57 2007    Mon Jul 09 01:23:57 2007    16    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Mon Jul 09 01:06:26 2007    Mon Jul 09 01:06:26 2007    5    Critical (3)    82000200    No Ranging Response received - T3 time-out
Mon Jul 09 01:06:13 2007    Mon Jul 09 01:06:13 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Mon Jul 09 01:05:41 2007    Mon Jul 09 01:05:41 2007    59    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 08 22:12:19 2007    Sun Jul 08 22:12:19 2007    9    Critical (3)    82000200    No Ranging Response received - T3 time-out
Sun Jul 08 22:11:57 2007    Sun Jul 08 22:11:57 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 08 22:11:24 2007    Sun Jul 08 22:11:24 2007    18    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 08 21:50:01 2007    Sun Jul 08 21:50:01 2007    9    Critical (3)    82000200    No Ranging Response received - T3 time-out
Sun Jul 08 21:49:46 2007    Sun Jul 08 21:49:46 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 08 21:49:13 2007    Sun Jul 08 21:49:13 2007    16    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 08 21:36:59 2007    Sun Jul 08 21:36:59 2007    1    Critical (3)    82000300    Init RANGING Critical Ranging Request Retries exhausted
Sun Jul 08 21:36:59 2007    Sun Jul 08 21:36:59 2007    17    Critical (3)    82000200    No Ranging Response received - T3 time-out
Sun Jul 08 21:36:32 2007    Sun Jul 08 21:36:32 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 08 21:35:59 2007    Sun Jul 08 21:35:59 2007    16    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 08 21:18:46 2007    Sun Jul 08 21:18:46 2007    9    Critical (3)    82000200    No Ranging Response received - T3 time-out
Sun Jul 08 21:18:17 2007    Sun Jul 08 21:18:17 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 08 21:17:45 2007    Sun Jul 08 21:17:45 2007    16    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 08 21:12:42 2007    Sun Jul 08 21:12:42 2007    5    Critical (3)    82000200    No Ranging Response received - T3 time-out
Sun Jul 08 21:12:34 2007    Sun Jul 08 21:12:34 2007    1    Critical (3)    82000300    Init RANGING Critical Ranging Request Retries exhausted
Sun Jul 08 21:12:34 2007    Sun Jul 08 21:12:34 2007    17    Critical (3)    82000200    No Ranging Response received - T3 time-out
Sun Jul 08 21:12:01 2007    Sun Jul 08 21:12:01 2007    1    Critical (3)    82000400    Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 08 21:11:28 2007    Sun Jul 08 21:11:28 2007    16    Critical (3)    82000500    Started Unicast Maintenance Ranging - No Response received

How does it look?
Cowon Iaudio X5 30 gig. It rocks!

Cable Modem Question

Reply #8 –
Your signal quality is very good, so the problem is not at your side. But, try to monitor the power levels during one day (while you have a connection). They should not fluctuate more than 2–3dBmV. If the fluctuations are greater, that suggests cabling problems. Also, the Woodinville's case looks similar to yours...

Anyway, I think that you can't do anything about this, the cable company must trace the problem. It seems that your instalation is not the culprit.
If age or weaknes doe prohibyte bloudletting you must use boxing