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Solved
CM1000 ethernet speed downgrades from gig to 100Mb
I have a CM1000 Modem going into a R6300 V2 Router on an XFinity 600 Mbps plan. Both devices have the latest firmware installed. After some random period of time (as short as 12 hours, as long as 6 days) I'll notice the Modem's ethernet light change from green to orange, and my internet only operates at 100 Mbps. Simply re-plugging the cable in usually fixes the issue, but I'm curious why it's happening in the first place, and if there's a way for me to fix it permanently. I've tried swapping out the ethernet cable (both are CAT 5e), and it still happens. No log lines are reported aside from the router re-connecting to the internet.
Are the ethernet ports on these known to go bad? I've noticed that it's super finicky, where if I plug it in wrong, the modem does not detect that it is plugged in at all.
Are the ethernet ports on these known to go bad? I've noticed that it's super finicky, where if I plug it in wrong, the modem does not detect that it is plugged in at all.
I believe I've resolved the issue - I took the modem to a friend who tinkers around with electronics, and he confirmed that most of the pins on the RJ45 jack were not soldered to the board from the factory. He soldered them all down, and ever since the port has worked without further issue.
7 Replies
Pault1984 wrote:
I have a CM1000 Modem going into a R6300 V2 Router on an XFinity 600 Mbps plan. Both devices have the latest firmware installed. After some random period of time (as short as 12 hours, as long as 6 days) I'll notice the Modem's ethernet light change from green to orange, and my internet only operates at 100 Mbps. Simply re-plugging the cable in usually fixes the issue, but I'm curious why it's happening in the first place, and if there's a way for me to fix it permanently. I've tried swapping out the ethernet cable (both are CAT 5e), and it still happens. No log lines are reported aside from the router re-connecting to the internet.
Are the ethernet ports on these known to go bad? I've noticed that it's super finicky, where if I plug it in wrong, the modem does not detect that it is plugged in at all.I've never had an issue. but maybe you have a sketchy port on the modem or on the router.
Or maybe even something got on the ethernet port connections thats causing the problem.
You could try powering off and unplugging the modem and router and cleaning the port connections with a little alcohol soaked into the tip of a q-tip. it wouldn't be the first time somethign was on the end of a cable when it got plugged in and it corroded or got the port fouled.
just make sure its fully dry before powering back on. And don't fully saturate the port. Just put the alcohol on the q-tip (not dripping) and gently clean it.
https://www.pcworld.com/article/170556/clean_clogged_port.html
plemans wrote:
Pault1984 wrote:
I have a CM1000 Modem going into a R6300 V2 Router on an XFinity 600 Mbps plan. Both devices have the latest firmware installed. After some random period of time (as short as 12 hours, as long as 6 days) I'll notice the Modem's ethernet light change from green to orange, and my internet only operates at 100 Mbps. Simply re-plugging the cable in usually fixes the issue, but I'm curious why it's happening in the first place, and if there's a way for me to fix it permanently. I've tried swapping out the ethernet cable (both are CAT 5e), and it still happens. No log lines are reported aside from the router re-connecting to the internet.
Are the ethernet ports on these known to go bad? I've noticed that it's super finicky, where if I plug it in wrong, the modem does not detect that it is plugged in at all.I've never had an issue. but maybe you have a sketchy port on the modem or on the router.
Or maybe even something got on the ethernet port connections thats causing the problem.
You could try powering off and unplugging the modem and router and cleaning the port connections with a little alcohol soaked into the tip of a q-tip. it wouldn't be the first time somethign was on the end of a cable when it got plugged in and it corroded or got the port fouled.
just make sure its fully dry before powering back on. And don't fully saturate the port. Just put the alcohol on the q-tip (not dripping) and gently clean it.
https://www.pcworld.com/article/170556/clean_clogged_port.html
Unfortunately, I already tried swabbing it out as described with no change.
Yeah, I'm guessing the port's solder connection to the board on the modem is coming loose. Since I'm well out of warranty I took apart the modem and it looks like only 2-3 of the RJ45 port's pins are soldered in place, the rest are just stuck through the board. I've managed to get the port into a position where the modem has been stable at 1 gig all night, but I'm going to have an electronically inclined friend reflow the pins and see if that makes it a permanent fix.
I'll check in after that's done and let ya'll know if that fixes my issue. I'm not sure if this is information anyone would actually have, but if there's a part number for the RJ45 PCB connector the CM1000 uses, and/or a supplier that sells repair parts, I'd love to know so I can try to find a new port in case it is busted.I believe I've resolved the issue - I took the modem to a friend who tinkers around with electronics, and he confirmed that most of the pins on the RJ45 jack were not soldered to the board from the factory. He soldered them all down, and ever since the port has worked without further issue.
