CM600 WAN port will only negotiate 100M/Full

CM600

Hardware Version 1.01B
Firmware Version V1.01.18

Very recently I started getting slow download speeds (10MB/s vs 50MB/s on Steam). Opened a ticket with Comcast, they've had multiple techs here and resolved multiple feed line issues. Now after showing 1200Mbps on their test equipment at the line at the modem, I verified that the WAN port is only connecting at 100M/Full. I tried several cables that test successfully to 1000M/Full on other devices. I tried a factory reset from the admin console and I see no newer firmware. Any ideas what could have happened?

Edit: I see it didn't go into the correct forum, but I didn't see "cable modems" in the drop-down.

FURRYe38
Nov 21, 2019
IF the modems been reset and you've tired different cables. Sounds like the WAN port is faulty and the modem probably needs to be replaced.

6 Replies

erricz
Aspirant
Nov 19, 2019
Dustin_V DarrenM Can you help move this post to the correct Cable Modem forum?
FURRYe38
Guru - Experienced User
Nov 21, 2019
IF the modems been reset and you've tired different cables. Sounds like the WAN port is faulty and the modem probably needs to be replaced.
- erricz
  Aspirant
  Nov 21, 2019
  Agreed, the new CM700 is performing flawlessly so far and I'm getting 700+Mbps right now. My upstream is pretty crap though (18Mbps) so I'll still need another service call.
  - FURRYe38
    Guru - Experienced User
    Nov 21, 2019
    Good to hear the new modem is working.
    
    Ensure there are no cable line splitters in between the modem and ISP service box.
    Please mark your thread as solved so others will know.
    
    Enjoy. :smileywink:

Forum Discussion

CM600 WAN port will only negotiate 100M/Full