No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx;CM-QOS=1.0;CM-VER=3.0;

Hello there @ossodiseppia thanks for using our Forums to bring this to our attention. We are happy to work together to see how we can help get this improved for you. Please send us a DM with your complete name and service address. Here's the detailed steps to direct message us:

• Click "Sign In" if necessary

• Click the "Peer to peer chat" icon (upper right corner of this page)

• Click the "New message" (pencil and paper) icon

• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list

• Type your message in the text area near the bottom of the window

• Press Enter to send your message

Thank you for the reply, Jorge. Thank you for showing me the easy way to contact support.  I find the Xfinity robot difficult to deal with.

I have a tech coming out tomorrow afternoon.  I would like to leave this thread open until after the tech comes out.

You are welcome @ossodiseppia and that sounds good! We will follow up with you tomorrow afternoon to see how the appointment well. We are looking forward to hearing from you and we are sure our techs will be able to help! 

@ossodiseppia out of curiosity, what model modem do you have?

Netgear C6900

I’ve had speeds in excess of 500Mbps in the past. Lately, the best I can get is 150. It dips as low as 50 at times. 

Tech arrived on time, yesterday and tested the line speed at 1300Mbps to the modem.  :-(  He got 1300Mbps and said it was my modem.  I showed him the speedtests I had performed shortly before his arrival.  They were all around 100Mbps.

I bought an Aris Surfboard S8200 and it has been delivered.  It sits unopened.

Just a few minutes ago I did the factory reset on the Netgear C6900.  I ran three speedtests:

After the factory reset and the three speed tests I posted above, I restored the backup file I made and ran the speed tests, again.  Please note, this is all done within minutes.

Frequency start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 567000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4)

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 24 567000000 Hz -1.3 dBmV 39.4 dB 0 0 2 Locked QAM256 25 573000000 Hz -1.5 dBmV 39.3 dB 0 0 3 Locked QAM256 26 579000000 Hz -1.5 dBmV 39.2 dB 0 0 4 Locked QAM256 27 585000000 Hz -1.6 dBmV 39.2 dB 0 0 5 Locked QAM256 28 591000000 Hz -1.6 dBmV 39.3 dB 0 0 6 Locked QAM256 29 597000000 Hz -1.5 dBmV 39.3 dB 0 0 7 Locked QAM256 30 603000000 Hz -1.6 dBmV 39.3 dB 0 0 8 Locked QAM256 31 609000000 Hz -1.7 dBmV 39.2 dB 0 0 9 Locked QAM256 32 615000000 Hz -1.7 dBmV 39.2 dB 0 0 10 Locked QAM256 33 621000000 Hz -1.4 dBmV 39.4 dB 0 0 11 Locked QAM256 34 627000000 Hz -1.3 dBmV 39.5 dB 0 0 12 Locked QAM256 35 633000000 Hz -1.5 dBmV 39.4 dB 0 0 13 Locked QAM256 36 639000000 Hz -1.6 dBmV 39.3 dB 0 0 14 Locked QAM256 37 645000000 Hz -1.5 dBmV 39.4 dB 0 0 15 Locked QAM256 38 651000000 Hz -1.4 dBmV 39.4 dB 0 0 16 Locked QAM256 39 657000000 Hz -1.2 dBmV 39.5 dB 0 0 17 Locked QAM256 40 663000000 Hz -1.6 dBmV 40.8 dB 0 0 18 Locked QAM256 41 669000000 Hz -2 dBmV 40.3 dB 0 0 19 Locked QAM256 42 675000000 Hz -2.3 dBmV 40 dB 0 0 20 Locked QAM256 43 681000000 Hz -2.3 dBmV 40.3 dB 0 0 21 Locked QAM256 44 687000000 Hz -2.4 dBmV 40.3 dB 0 0 22 Locked QAM256 45 693000000 Hz -2.1 dBmV 40.6 dB 0 0 23 Locked QAM256 46 699000000 Hz -2.3 dBmV 40.4 dB 0 0 24 Locked QAM256 47 705000000 Hz -2.2 dBmV 40.3 dB 0 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 2 5120 Ksym/sec 16400000 Hz 41.5 dBmV 2 Locked ATDMA 11 2560 Ksym/sec 40400000 Hz 41 dBmV 3 Locked ATDMA 5 5120 Ksym/sec 35600000 Hz 40.3 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 29200000 Hz 41 dBmV 5 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 41 dBmV 6 Locked ATDMA 1 2560 Ksym/sec 10400000 Hz 42 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

I've done this several times over the last 30 minutes, reset/restore reset/restore and the results are the same.  I have tested with and without the wireless on and it's the same each time.

If I restore the backup file, I get lousy speeds.  If I factory reset and change the wireless SSID to what I have had for many years, I get good download and upload speeds.

I'm stumped.

Not to b argumentative, but a factory reset is not a fix.  It's a band-aid.  Someone at Xfinity should look into this and see what's corrupting the configuration of my modem.  I'm not the first one to experience this issue as I've run into others while researching.

For anyone else that runs into this, here is what has worked for me.  Before doing a factory reset, make note of your Wi-Fi settings, blocked sites, and any reserved IP addresses, etc.  Do the factory reset, then update the Wi-Fi setting, blocked sites, etc.  After you have done all of this and tested your connections, run a backup of the configuration and save that to a location that can be easily found.  If you run into speed issues again, simply restore that backup file to your router.  It will only take a few minutes of your time.  It is the least time consuming test to see if your router configuration has been corrupted.

For the Xfinity folks who are monitoring this thread, please note.  This is a huge inconvenience for those of us that run into issues like this.  It consumes our time and creates a bad experience with the product supplied by Xfinity.  And then there are those of us that have been told our modems are bad and have replaced them unnecessarily.  That can often time be a great expense.  Where I live, Xfinity is the only ISP that offers a service over 100Mbps.  If I had other options, I would certainly explore them.

I messaged Xfinity Support my home address so they could run some diagnostics.  Since then, the internet speed at my home has plummeted.