Switched from MB8611 to Coda56 Modem - Experiencing Slower DL Speeds - Modem Provisioning Issue?

Hello, I recently installed a new Coda56 modem (previously using a Motorola MB8611) and connected to my Asus AX86U router. Everything is set up exactly the same as it was except the modem and one setting on the router- I enabled using the 2.5gb port to use for incoming WAN. As of today I also updated my router firmware.

I am measuring the DL/UL speeds via the router portal. Since the router is directly connected to the modem via cat6 cable, I would expect to see close to my advertised plan speed. I am currently on a 1Gbps plan and ever since swapping the modem, I have been getting 300-500Mbps download speeds, whereas I was getting 700-900 with the MB8611. The upload speed actually improved-- it went from 20-30 to 60-70Mbps.

I am wondering if this is a modem provisioning/firmware issue- I'm open to suggestions on things to check/try.

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XfinityKam

Official Employee

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104 Messages

1 month ago

@user_gi0xec Thank you for reaching out I'd like to try a bit of troubleshooting with you here in the thread. Could you help us with some more details please? What speeds are you seeing at the modem compared to the router? Have you tried sending a signal to the modem using the troubleshooting steps in the Xfinity app or My Account app? Have you attempted any other troubleshooting steps so far? Sharing this info will help us understand what’s going on and figure out the next best steps. Please also take a look at this for me please to help with troubleshooting your internet concern https://forums.xfinity.com/conversations/internet/answered-tips-for-troubleshooting-your-xfinity-internet-connection/602da481c5375f08cd7fbb7c

user_gi0xec

Visitor

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3 Messages

Hello Kam, yesterday evening my internet started repeatedly disconnecting, and has remained disconnected all day. I've scheduled a tech to come out on Wednesday. Whatever caused this is likely related to the internet speeds I was seeing but not exactly what I originally posted about...

However, thank you for the link! Some good information in there.

-I have of course tried turning it off and off again several times with no luck.

-Modem has flashing green lights for upstream/downstream that will occasionally go solid. I have seen the lights also go solid blue, only to walk away for 30 seconds and suddenly the internet is out and lights are flashing again.

-I rebooted the modem and plugged into the modem directly with my pc and observe the same behavior. Looking at the modem status page, the Coda56 has somewhat limited info.

The modem is not able to connect to any channels at all right now, but the "upstream overview" is showing a signal strength of 63.021dBmV. Not sure if this is the same thing as power level, but if so, looks like that is indicating an issue somewhere between my modem and Comcast. Downstream overview is showing a signal strength of -3.2dBmV.

I do not have any splitters installed, and the coax cable connected to the modem runs through a hole in the exterior wall (in my basement) straight to an f block that connects to the service drop cable- no intermediate connections in between. Cables do not have any kinks or bends that I can see. I have also tried disconnecting the coax cable and reconnecting at the modem side to ensure the cable is properly seated/tightened.

Seems like it's a good thing I scheduled a service appointment.

btw- prior to replacing modem, internet was occasionally dropping and reconnecting but way less frequently than right now. wondering if the download speed differences were not related to the modem swap at all..

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1 month ago

XfinityJeniece

Official Employee

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3.9K Messages

user_gi0xec Thanks for confirming those details, and I am happy to hear you got an appointment scheduled already. We would be happy to take a look at your signals on our end. Can you please send us a Direct Message with your full name and your full address?

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- As you are typing a drop-down list appears. Select "Xfinity Support" from that list

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

Press Enter to send it.

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1 month ago

user_gi0xec

Visitor

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3 Messages

Sure, that would be great if you can check signals on your end-- Just sent a DM with my information.

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1 month ago

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Switched from MB8611 to Coda56 Modem - Experiencing Slower DL Speeds - Modem Provisioning Issue?

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