Replacing WebStar cable Modem with Linksys CM100

I have a WebStar modem with RoadRunner service and the thing has been a royal PIB. At times it seems to stop and I have no internet service. have called RR and they say everything looks good and there is no problem. I have had enough. I have been complaining to RR for 3-4 years and they have replaced the modem and I still have the same problems. I have purchased a Linksys CM100 modem and may install that. I am not seeing that this modem has max sppeds of 100 MB but my computers have GB internet. I have a Dlink 655 router so will I receive GB speeds? Should I just scrap the CM100 and get something else?

You will have gigabit ethernet within your local wired network but you will be 100 MBps from the router to the modem and from the modem to the cable network. That modem definitely does not have gigabit ethernet for its sole ethernet port.

It's no big deal that your modem has a 100MB port because your downstream speed won't even come close to that.

OK thanks. I was just wondering if I should skip this and buy a motorola but sounds like this will work just as good.

sounds more like a line issue than a modem issue. you can loginto most modems and see a log/status. if you do this when you lose your connection, you can tell where the issue is.

Quote from dayv : sounds more like a line issue than a modem issue. you can loginto most modems and see a log/status. if you do this when you lose your connection, you can tell where the issue is.

yup, most modems, but not TW modems.This is what I get.

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Please contact your data services provider for more information about this feature and its availability on the network.

To exit this page, click on the "Back" button on your browser tool bar to return to the previous page or click on the "System" link above.

Quote from dayv : sounds more like a line issue than a modem issue. you can loginto most modems and see a log/status. if you do this when you lose your connection, you can tell where the issue is.

I was able to get in and here is the log. Can you help troubleshoot?
Tue Jul 31 12:42:16 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 29 20:19:39 2012 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Sun Jul 29 20:19:27 2012 Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 29 20:18:54 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Sun Jul 22 19:44:59 2012 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Sun Jul 22 19:44:47 2012 Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 22 19:44:15 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Sat Jul 21 12:33:59 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Tue Jul 17 13:02:11 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Sun Jul 15 08:38:00 2012 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Sun Jul 15 08:37:50 2012 Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Sun Jul 15 08:37:17 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Fri Jul 13 12:37:46 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response.
Fri Jun 15 13:46:10 2012 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC f...
Fri Jun 15 04:03:11 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Thu Jun 14 10:25:14 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Sun Jun 10 23:24:01 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Sat Jun 02 19:53:22 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Thu May 31 02:41:18 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Thu May 17 23:46:20 2012 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Thu May 17 23:46:08 2012 Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Thu May 17 23:45:35 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Mon May 14 09:18:41 2012 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...

Nothing out of the ordinary there. I have tons of those exact messages across my logs and I have no connectivity issues at all.

Quote from menace33 : Nothing out of the ordinary there. I have tons of those exact messages across my logs and I have no connectivity issues at all.

Really? No response received and critical errors are nothing?

What seems to happen is if I click to move to a web page and look at the modem the send and receive lights are not flashing as it did with my past modem. I then get a message that I have no internet.

Notice the time stamps. Those are spurts every week where the cable modem tries to renew its IP address from the DHCP server and hiccuped. It eventually went through and notice they are 1 week apart which is a typical DHCP renewal frame.

Quote from menace33 : Notice the time stamps. Those are spurts every week where the cable modem tries to renew its IP address from the DHCP server and hiccuped. It eventually went through and notice they are 1 week apart which is a typical DHCP renewal frame.

So my send and receive lights do not light up and I get a message that I have no connectivity and this is normal?

Quote from house kitten : So my send and receive lights do not light up and I get a message that I have no connectivity and this is normal?

I never said that it was normal. I said based on those log messages, there is nothing to see here that would warrant concern. with dayv that it reads more like an externa interference issue on your line.

What is your line configuration looking like?

What is the SNR?
What is the downstream power level?
What is the upstream power level?

I'm not accustomed to the Linksys CM100 to know what page that is on within its diagnostic pages.

Quote from menace33 : I never said that it was normal. I said based on those log messages, there is nothing to see here that would warrant concern. with dayv that it reads more like an externa interference issue on your line. What is your line configuration looking like? What is the SNR? What is the downstream power level? What is the upstream power level? I'm not accustomed to the Linksys CM100 to know what page that is on within its diagnostic pages.

not sure what SRN is but this is what I found on the Webstar: (signal noise ratio?)
Downstream Channel
The data shown in the table below provides information about the signal coming from the network to your cable modem.
Downstream Status Operational
Channel ID 3
Downstream Frequency 627000000 Hz
Modulation 256QAM
Bit Rate 10496000 bits/sec
Power Level 4.4 dBmV
Signal to Noise Ratio 37.8 dB
Upstream Channel
The data shown in the table below provides information about the signal being transmitted to the network from your cable modem.
Upstream Status Operational
Channel ID 4
Upstream Frequency 36000000 Hz
Modulation 16QAM
Bit Rate 2304000 bits/sec
Power Level 46.5 dBmV

Name: WebSTAR DPC2100R2
Hardware Version: 2.1
Software Version: v2.0.2r1256-060303
Receive Power Level: 4.4 dBmV
Transmit Power Level: 46.5 dBmV
Cable Modem Status: Operational

Quote from house kitten : not sure what SRN is but this is what I found on the Webstar: (signal noise ratio?) Downstream Channel The data shown in the table below provides information about the signal coming from the network to your cable modem. Downstream Status Operational Channel ID 3 Downstream Frequency 627000000 Hz Modulation 256QAM Bit Rate 10496000 bits/sec Power Level 4.4 dBmV Signal to Noise Ratio 37.8 dB Upstream Channel The data shown in the table below provides information about the signal being transmitted to the network from your cable modem. Upstream Status Operational Channel ID 4 Upstream Frequency 36000000 Hz Modulation 16QAM Bit Rate 2304000 bits/sec Power Level 46.5 dBmV Name: WebSTAR DPC2100R2 Hardware Version: 2.1 Software Version: v2.0.2r1256-060303 Receive Power Level: 4.4 dBmV Transmit Power Level: 46.5 dBmV Cable Modem Status: Operational

I had the exact same problem with Charter from the date of installation until 2 weeks ago. Line tech finally came out and changed the tap on the power pole and no problems since. Not one dropped connection since the new tap was installed.