Hi,Just activated CM1200 on Xfinity. I have 600MB download speed plan. 2 questions1. Comcast told me since I did not rent the Cable modem from them, they don't update the firmware. I have to ask Netgear for the latest version. Where can I install that from please? 2. I have Netgear C7000 WiFi Router connected. No matter what I do, my speedtest does not go beyond 200 MB even while standing next to the router! Router has the latest firmware. Also I get connection dropped frequently. Any suggestions on 1 and 2?Thanks

metasharma wrote:Hi,Just activated CM1200 on Xfinity. I have 600MB download speed plan. 2 questions1. Comcast told me since I did not rent the Cable modem from them, they don't update the firmware. I have to ask Netgear for the latest version. Where can I install that from please? ---You don't. The isp does. The use the firmware that they certify for the CM1200. Its not user updated. https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-modem-router2. I have Netgear C7000 WiFi Router connected. No matter what I do, my speedtest does not go beyond 200 MB even while standing next to the router! Router has the latest firmware. Also I get connection dropped frequently. ----I'm impressed you have both the cm1200 and the C7000 working together. The c7000 is a modem/router combo device and doesn't have a wan port. To get it working, you'd have to rig it up using some gimmicks to get it working. similar to here: https://community.netgear.com/t5/Cable-Modems-Routers/Can-I-use-a-C6300-cable-modem-without-cable-internet/m-p/1463500Do you actually have the C7000 or is it a router only device? and if so, which one? Any suggestions on 1 and 2?Thanks

Metasharma, you should automatically receive the latest CM1200 firmware (V2.02.05) from Comcast when you reboot the modem.

Netgear support is horrible. Now that that is out the way. Here is the real issue. Cable Modem = CM1200Router = RAX200 Cable Modem is connected to Router in network aggregated connected to give a maximum speed of 2000 Gpbs.Xfinity ISP has me connected up as 1.2Gbps. I was running fine for the past 6 months with a network speed of ~1.2 Gpbs using the Nighthawk app on my iphone connected to the router. At the turn of the year, Xfinity has new pricing plans and service and moves me to it without my knowledge. Great Business Ethics Xfinity. Also at the same time, my network speed drops to 600 Mbps. It has been like that for the past 3 weeks. I call Xfinity and they say I am still connected at 1.2 Gbps. They do some tests and suggest I call Netgear. Netgear goes through their idiot checks and automatically say it is something on my network causing the issue and wants to charge me $44 to have a look further. Nothing has changed on my network. So, I go with my own debugging. I disconnect my wire devices to the router and turn off all of my wifi devices. I do a power cycle of the CM1200 modem along with a power cycle of the RAX200 router. Run the Nighthawk speed test and still get 600 Mbps. So which company is the BS artist. Xfinity with their bait and switch connection service. Or Netgear? I bet if I get a lawyer involved I would get prompt resolution.

Would be and ISP issue if and when they changed somenthing. Post a copy and paste of the modems connection status page here in the forums.Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.Be sure there are no coax cable line splitters in the between the modem and ISP service box. Be sure your using good quality RG6 coax cable up to the modem. Be sure to power OFF the modem for 1 minute them back ON.https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853 Ask the ISP to ensure the modems FW is up to date:https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-modem-router FYI, as per DOCSIS specs, it's up to ALL cable ISP to update modem FW. Users are not allowed this. Some ISP will not update user owned modems. JoeMor wrote:Netgear support is horrible. Now that that is out the way. Here is the real issue. Cable Modem = CM1200Router = RAX200 Cable Modem is connected to Router in network aggregated connected to give a maximum speed of 2000 Gpbs.Xfinity ISP has me connected up as 1.2Gbps. I was running fine for the past 6 months with a network speed of ~1.2 Gpbs using the Nighthawk app on my iphone connected to the router. At the turn of the year, Xfinity has new pricing plans and service and moves me to it without my knowledge. Great Business Ethics Xfinity. Also at the same time, my network speed drops to 600 Mbps. It has been like that for the past 3 weeks. I call Xfinity and they say I am still connected at 1.2 Gbps. They do some tests and suggest I call Netgear. Netgear goes through their idiot checks and automatically say it is something on my network causing the issue and wants to charge me $44 to have a look further. Nothing has changed on my network. So, I go with my own debugging. I disconnect my wire devices to the router and turn off all of my wifi devices. I do a power cycle of the CM1200 modem along with a power cycle of the RAX200 router. Run the Nighthawk speed test and still get 600 Mbps. So which company is the BS artist. Xfinity with their bait and switch connection service. Or Netgear? I bet if I get a lawyer involved I would get prompt resolution.

Coax Cable Provided by Comcast Xfinity service. The cable wasn't an issue before. No coax splitter is being used now. I was using a splitter before and was receiving the 1.2 Gbps speed before I dropped the TV service and went to streaming with another provider. I also checked and made sure CM1200 was loaded with the latest firmware (V3.02.01). Lastly, I tried saving off my settings updating the RAX200 to the latest firmware update and then applying my saved settings back. No luck. CM1200 Event LogSun Jan 31 14:05:16 2021Warning (5)Dynamic Range Window violationSun Jan 31 14:05:16 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Sun Jan 31 10:51:34 2021Warning (5)Dynamic Range Window violationSun Jan 31 10:51:34 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Sat Jan 30 22:04:08 2021Warning (5)Dynamic Range Window violationSat Jan 30 22:04:08 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Fri Jan 29 10:01:56 2021Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 19:55:16 2021Warning (5)Dynamic Range Window violationWed Jan 27 19:55:16 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 19:54:44 2021Notice (6)CM-STATUS message sent. Event Type Code: 3; Chan ID: N/A; DSID: �; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 19:54:41 2021Warning (5)Unicast DSID PSN startup errorWed Jan 27 19:54:24 2021Notice (6)CM-STATUS message sent. Event Type Code: 5; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 19:54:15 2021Warning (5)REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 19:54:05 2021Notice (6)TLV-11 - unrecognized OID;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 18:55:18 2021Warning (5)REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 18:55:08 2021Notice (6)TLV-11 - unrecognized OID;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 18:53:43 2021Critical (3)Resetting the cable modem due to docsDevResetNowWed Jan 27 18:50:32 2021Notice (6)CM-STATUS message sent. Event Type Code: 5; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 18:50:24 2021Warning (5)REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 18:50:14 2021Notice (6)TLV-11 - unrecognized OID;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Wed Jan 27 15:58:05 2021Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Mon Jan 25 21:06:52 2021Warning (5)Dynamic Range Window violationMon Jan 25 21:06:52 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Mon Jan 25 20:16:37 2021Warning (5)Dynamic Range Window violationMon Jan 25 20:16:37 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Mon Jan 25 18:57:05 2021Warning (5)Dynamic Range Window violationMon Jan 25 18:57:05 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Sun Jan 24 04:10:28 2021Warning (5)Dynamic Range Window violationSun Jan 24 04:10:28 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Sat Jan 23 23:49:13 2021Warning (5)Dynamic Range Window violationSat Jan 23 23:49:13 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Sat Jan 23 18:53:42 2021Warning (5)Dynamic Range Window violationSat Jan 23 18:53:42 2021Warning (5)RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:41:34:58;CMTS-MAC=00:6c:bc:b9:a7:91;CM-QOS=1.1;CM-VER=3.1;Sat Jan 23 18:51:02 2021Warning (5)Dynamic Range Window violation

CM1200 Speed, firmware | NETGEAR Communities

13 Replies

plemans
Guru - Experienced User
Aug 25, 2020
metasharma wrote:
Hi,
Just activated CM1200 on Xfinity. I have 600MB download speed plan. 2 questions
1. Comcast told me since I did not rent the Cable modem from them, they don't update the firmware. I have to ask Netgear for the latest version. Where can I install that from please? ---You don't. The isp does. The use the firmware that they certify for the CM1200. Its not user updated.
https://kb.netgear.com/000036375/What-s-the-latest-firmware-version-of-my-NETGEAR-cable-modem-or-modem-router
2. I have Netgear C7000 WiFi Router connected. No matter what I do, my speedtest does not go beyond 200 MB even while standing next to the router! Router has the latest firmware. Also I get connection dropped frequently. ----I'm impressed you have both the cm1200 and the C7000 working together. The c7000 is a modem/router combo device and doesn't have a wan port. To get it working, you'd have to rig it up using some gimmicks to get it working. similar to here: https://community.netgear.com/t5/Cable-Modems-Routers/Can-I-use-a-C6300-cable-modem-without-cable-internet/m-p/1463500
Do you actually have the C7000 or is it a router only device? and if so, which one?
Any suggestions on 1 and 2?
Thanks
- Topology
  Virtuoso
  Aug 25, 2020
  Metasharma, you should automatically receive the latest CM1200 firmware (V2.02.05) from Comcast when you reboot the modem.
  - JoeMor
    Tutor
    Jan 30, 2021
    Netgear support is horrible. Now that that is out the way. Here is the real issue.
    
    Cable Modem = CM1200
    Router = RAX200
    
    Cable Modem is connected to Router in network aggregated connected to give a maximum speed of 2000 Gpbs.
    Xfinity ISP has me connected up as 1.2Gbps. I was running fine for the past 6 months with a network speed of ~1.2 Gpbs using the Nighthawk app on my iphone connected to the router.
    
    At the turn of the year, Xfinity has new pricing plans and service and moves me to it without my knowledge. Great Business Ethics Xfinity. Also at the same time, my network speed drops to 600 Mbps. It has been like that for the past 3 weeks. I call Xfinity and they say I am still connected at 1.2 Gbps. They do some tests and suggest I call Netgear. Netgear goes through their idiot checks and automatically say it is something on my network causing the issue and wants to charge me $44 to have a look further. Nothing has changed on my network.
    
    So, I go with my own debugging. I disconnect my wire devices to the router and turn off all of my wifi devices. I do a power cycle of the CM1200 modem along with a power cycle of the RAX200 router. Run the Nighthawk speed test and still get 600 Mbps.
    
    So which company is the BS artist. Xfinity with their bait and switch connection service. Or Netgear? I bet if I get a lawyer involved I would get prompt resolution.

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CM1200 Speed, firmware