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CM700 Slow Download speeds
Hi, I have had a Netgear CM400 for several years. I upgraded my modem from CM400 to CM700 as my CM400 is older and occasionally resets/drops signal. My speed test of the CM400 prior to switching was 117mbs. Checking the new CM700 I have only been getting ~33mbs. I have done various troubleshooting and have gone as far as direct LAN connection to my laptop from the modem and direct coax line that comes into the house from outside, and factory reset of the modem to eliminate house lines and router and was still limited to ~33mbs on the CM700. I have XFINITY 100mbs plan. I have switched back to the CM400 twice now and consistently get ~112-117mbs on the older CM400. I had originally purchased a new Arris modem to replace the CM400 and was limited to the same ~33mbs, switched back to the CM400 and was back to >100mbs. I thought it was the Arris at the time and decided to return and purchase another Netgear and got the CM700. Based on another post I saw, I’m wondering if the coax line isn’t making a solid connection to the CM700, I can’t believe that two different new modems from different manufactures are limiting my speed similarly. I am noticing that the COAX connection post is longer on the CM700 than it is on the CM400. My next step will be to purchase a new RG6 Coax cable and swap modems again, but have to wait 48hours to switch modems. Any other thoughts? Thanks.
Have the ISP check the signal and line quality UP to the modem.
Be sure there are not coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.FYI, the CM700 is a puma chip set modem, has a known problem;
The CM1000,1100, and 1200 are broadcome based modems that you might concider over the CM700.
3 Replies
Have the ISP check the signal and line quality UP to the modem.
Be sure there are not coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.FYI, the CM700 is a puma chip set modem, has a known problem;
The CM1000,1100, and 1200 are broadcome based modems that you might concider over the CM700.
Thanks for the heads up on the CM700 chip set issues. Update. I decided to take the CM700 back and upgraded to a CM1000. I checked the CM400 before the swap today and was at 120mbs, when the CM1000 was connected, the speed read 33mbs again, the same as the three other previous new modems I tried to connect. I had the Xfinity tech re-enable the CM400 again until they can send a technician out to check the line coming to the house after this whole Covid thing settles down. I am reading 120mbs again with the CM400. The only thing I can think of is that there is something to do with the Coax line and the newer modems… it’s odd that I’m limited to 1/3rd of the speed I should be getting when using the newer modems, but the older modem works fine (for speed anyway). It still power cycles about 1x to 2x per day. The COAX input post is a little shorter on the CM400 than any of the other new modems I’ve tried … could the wire not be seating deep enough? I’ve tried a couple different cables, with the same result and plugging the modem directly to the line outside of the house so that there are no splitters with the same result.
Have the tech check everying when they get there.