Slow upload speed with Hitron CODA56

@XfinityMarshante​ I ran the speed test on both wired and wireless and the results are the same every time. It’s limited to 45 Mbps.

I ran the speed test on both wired and wireless. Every time I ran it I got the same results. Limited to 45 Mbps upload. I know my modem and router can handle way more than that so I’m thinking that’s not the issue here.

@user_oyx5jm, thank you for the details. If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, we'd be more than happy to look into this for you.

To send a Direct Message, please click on the “Direct Message” icon in the top-right corner of the screen, click the "New message" icon, then type or select "Xfinity Support". Type your message in the text area near the bottom of the window and press Enter to send your message and initiate a live session.

@user_oyx5jm​ Any resolution to this issue on your Hitron Coda56 ? I am having a similar issue with the Arris S33 - I have spend hours on the phone with support trying to diagnose why the modem is capped at 45 Mbps Upload. I just ordered a Hitron Code56 to replace the Arris, as I was told that its one of the only ones that Xfinity supports on the Next Gen platform, but now I am concerned I may be wasting my money and the Hitron will be  just as impacted by these issues.  

A summary of my similar issues to what you are describing:

I was on the 1.3 Gbps plan , but pulling down 1.63Gbps for over 2 years – no complaints.   They moved me to the 2.2 Gbps plan to give me a new 5 year price lock, so I figured, why not ?  Immediately after switching – like 2 mins,  seeing ~1.5 Gbps. My ARRIS S33 shows OFDM downstream channel 193 (~900 MHz) with ~39 dB SNR and 41,646,398 corrected errors / 0 uncorrectables. The OFDM channel is currently QAM256.  Verified the CMTS bootfile/modulation profile and confirmed it’s provisioned for the 2.2 Gbps tier.  I had them push another fresh provisioning image from their side. Do not a factory reset if they request it unless you confirm they have changed or can change parameters in the bootfile. The target OFDM modulation needs to be set to (QAM1024 or QAM2048) to utilize these new 2.0 Gbps plans on Next Gen.  The other option is they  add a second OFDM channel.  If the node outside that feeds your house is plant‑limited, schedule a field tech and provide the node’s max OFDM QAM and any planned plant upgrades. If provisioning policy blocks third‑party modems (like looks like my Arris S33 is impacted and they don’t have new config files for it that can support speeds over 2.0 Gbps) then get a technician to provision an Xfinity XB10 modem/gateway temporarily to test.  Then go into the portal and look at the configs to compare.  Save the screen shots and records.  There is ZERO reason why the Arris S33 or the Hitron CODA56 can't support these new speeds.  Even if your uploads are limited to 400 Mpbs - that is INSANELY fast for a home internet set up.   99% of people will never use load speeds in this range.  This is my current plan and I have probably just wasted money buyng a new modem to test my theories.   Good luck getting through the Xfinity App tier 1 support and wasting hours of your time before you get the technicians that can actually help you.......