I have voice/internet/TV with Comcast, had had their 300mbps service, getting about 115mbps download and 23mbps upload speed on wifi on a 2020 Macbook Pro (802.11n/ac and no ethernet port) running Monterey 12.2.1 and Safari 15.3. Hardware version 2.0, firmware v2.01.45. Purchased the c7100v from netgear.com two weeks ago, set it up this week. While getting a new plan witjh Comcast, I thought I'd try the 900 mbps for $10/mo more. My speeds have not changed. I called Netgear, was told to call Comcast and tell them that my downstream power should be higher and that they should lock all the upstream channels. I called Comcast, who said Netgear doesn't know what it's talking about. Despite the label saying "up to 960mbps" it can really only accommodate 800mbps, and the incompatibility will cause more and more problems, and I should return this one and purchase the CAX80 instead. Meanwhile I see others on this forum with Comcast and the same router who are getting 300-400mbps on 1000mbps plans, so where do I go from here? Call Comcast and ask about the power again? Call Comcast and tell them I want to return to the300mbps plan? Call Netgear and return this router for a different one? Call Verizon, return the Netgear and cancel Comcast?Advice appreciated! Here is the info on my connectionChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables1LockedQAM2565475750000 Hz2.7 dBmV39.8 dB002LockedQAM2561451750000 Hz2.5 dBmV39.8 dB003LockedQAM2562457750000 Hz2.6 dBmV39.8 dB004LockedQAM2563463750000 Hz2.7 dBmV39.7 dB005LockedQAM2564469750000 Hz2.7 dBmV39.8 dB006LockedQAM2566481750000 Hz2.6 dBmV39.7 dB007LockedQAM2567487750000 Hz2.6 dBmV39.7 dB008LockedQAM2568493750000 Hz2.7 dBmV39.8 dB009LockedQAM2569499750000 Hz2.5 dBmV39.7 dB0010LockedQAM25610505750000 Hz2.5 dBmV36.3 dB0011LockedQAM25611511750000 Hz2.7 dBmV39.8 dB0012LockedQAM25612517750000 Hz2.7 dBmV39.6 dB0013LockedQAM25613523750000 Hz2.7 dBmV39.6 dB0014LockedQAM25614529750000 Hz2.8 dBmV39.7 dB0015LockedQAM25615535750000 Hz2.8 dBmV39.6 dB0016LockedQAM25616541750000 Hz2.9 dBmV36.6 dB0017LockedQAM25617547750000 Hz3.0 dBmV40.3 dB0018LockedQAM25618553750000 Hz2.8 dBmV39.9 dB0019LockedQAM25619559750000 Hz2.9 dBmV39.9 dB0020LockedQAM25620565750000 Hz3.1 dBmV40.2 dB0021LockedQAM25621571750000 Hz3.1 dBmV40.2 dB0022LockedQAM25622577750000 Hz3.1 dBmV40.0 dB0023LockedQAM25623583750000 Hz3.2 dBmV40.1 dB0024LockedQAM25624589750000 Hz3.1 dBmV39.9 dB00<tabindex=-1>Upstream Bonded Channels</tabindex=-1>ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower1LockedATDMA45120 Ksym/sec29200000 Hz41.8 dBmV2LockedATDMA25120 Ksym/sec16400000 Hz41.8 dBmV3LockedATDMA35120 Ksym/sec22800000 Hz41.8 dBmV4LockedATDMA55120 Ksym/sec35600000 Hz41.8 dBmV5LockedATDMA62560 Ksym/sec40400000 Hz41.8 dBmV6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV

Your power levels look fine. But you probably bought the wrong device if you're wanting close to gigabit speeds. The C7100v isn't docsis 3.1 (only 3.0) compatible and xfinity's (and other isp's) have been pushing to require docsis 3.1 devices for lower and lower speed tiers. I'm impressed they even said they'd allow it for their 800mbps tier as ISP's like cox are requiring docsis 3.1 for anything 400+. Also, you won't hit 400+ over wireless on that device. Only on wired. One thing you can do is power off the modem and disconnect it from the coax. Give it a couple minutes and then reconnect the coax and boot it back up. Maybe xfinity didn't push the correct provisioning to it (or push it at all). Something to check on.

RIRed

Tutor

Apr 16, 2022

Solved

C7100v compatible with Comcast 900mbps

I have voice/internet/TV with Comcast, had had their 300mbps service, getting about 115mbps download and 23mbps upload speed on wifi on a 2020 Macbook Pro (802.11n/ac and no ethernet port) running Monterey 12.2.1 and Safari 15.3. Hardware version 2.0, firmware v2.01.45. Purchased the c7100v from netgear.com two weeks ago, set it up this week. While getting a new plan witjh Comcast, I thought I'd try the 900 mbps for $10/mo more. My speeds have not changed. I called Netgear, was told to call Comcast and tell them that my downstream power should be higher and that they should lock all the upstream channels.

I called Comcast, who said Netgear doesn't know what it's talking about. Despite the label saying "up to 960mbps" it can really only accommodate 800mbps, and the incompatibility will cause more and more problems, and I should return this one and purchase the CAX80 instead.

Meanwhile I see others on this forum with Comcast and the same router who are getting 300-400mbps on 1000mbps plans, so where do I go from here? Call Comcast and ask about the power again? Call Comcast and tell them I want to return to the300mbps plan? Call Netgear and return this router for a different one? Call Verizon, return the Netgear and cancel Comcast?

Advice appreciated!

Here is the info on my connection

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	5	475750000 Hz	2.7 dBmV	39.8 dB	0	0
2	Locked	QAM256	1	451750000 Hz	2.5 dBmV	39.8 dB	0	0
3	Locked	QAM256	2	457750000 Hz	2.6 dBmV	39.8 dB	0	0
4	Locked	QAM256	3	463750000 Hz	2.7 dBmV	39.7 dB	0	0
5	Locked	QAM256	4	469750000 Hz	2.7 dBmV	39.8 dB	0	0
6	Locked	QAM256	6	481750000 Hz	2.6 dBmV	39.7 dB	0	0
7	Locked	QAM256	7	487750000 Hz	2.6 dBmV	39.7 dB	0	0
8	Locked	QAM256	8	493750000 Hz	2.7 dBmV	39.8 dB	0	0
9	Locked	QAM256	9	499750000 Hz	2.5 dBmV	39.7 dB	0	0
10	Locked	QAM256	10	505750000 Hz	2.5 dBmV	36.3 dB	0	0
11	Locked	QAM256	11	511750000 Hz	2.7 dBmV	39.8 dB	0	0
12	Locked	QAM256	12	517750000 Hz	2.7 dBmV	39.6 dB	0	0
13	Locked	QAM256	13	523750000 Hz	2.7 dBmV	39.6 dB	0	0
14	Locked	QAM256	14	529750000 Hz	2.8 dBmV	39.7 dB	0	0
15	Locked	QAM256	15	535750000 Hz	2.8 dBmV	39.6 dB	0	0
16	Locked	QAM256	16	541750000 Hz	2.9 dBmV	36.6 dB	0	0
17	Locked	QAM256	17	547750000 Hz	3.0 dBmV	40.3 dB	0	0
18	Locked	QAM256	18	553750000 Hz	2.8 dBmV	39.9 dB	0	0
19	Locked	QAM256	19	559750000 Hz	2.9 dBmV	39.9 dB	0	0
20	Locked	QAM256	20	565750000 Hz	3.1 dBmV	40.2 dB	0	0
21	Locked	QAM256	21	571750000 Hz	3.1 dBmV	40.2 dB	0	0
22	Locked	QAM256	22	577750000 Hz	3.1 dBmV	40.0 dB	0	0
23	Locked	QAM256	23	583750000 Hz	3.2 dBmV	40.1 dB	0	0
24	Locked	QAM256	24	589750000 Hz	3.1 dBmV	39.9 dB	0	0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	4	5120 Ksym/sec	29200000 Hz	41.8 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	16400000 Hz	41.8 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	22800000 Hz	41.8 dBmV
4	Locked	ATDMA	5	5120 Ksym/sec	35600000 Hz	41.8 dBmV
5	Locked	ATDMA	6	2560 Ksym/sec	40400000 Hz	41.8 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

plemans
Apr 17, 2022
Your power levels look fine.

But you probably bought the wrong device if you're wanting close to gigabit speeds.

The C7100v isn't docsis 3.1 (only 3.0) compatible and xfinity's (and other isp's) have been pushing to require docsis 3.1 devices for lower and lower speed tiers. I'm impressed they even said they'd allow it for their 800mbps tier as ISP's like cox are requiring docsis 3.1 for anything 400+.

Also, you won't hit 400+ over wireless on that device. Only on wired.

One thing you can do is power off the modem and disconnect it from the coax. Give it a couple minutes and then reconnect the coax and boot it back up. Maybe xfinity didn't push the correct provisioning to it (or push it at all). Something to check on.

9 Replies

FURRYe38
Guru - Experienced User
Apr 16, 2022
You need to connect your mac book via ethernet to the modem to test higher speeds. They have inexpensive USB to ethernet adapters out there. I use one on mine.

You'll not see anything near 900Mpbs on 5Ghz Wifi. Due to limitations on 5Ghz and AC mode and device support and design, most max top out at around 300-500Mpbs.
- RIRed
  Tutor
  Apr 17, 2022
  Thank you Furry.
  I was hoping to see a difference from the 300mbps service(actual download speed on mine of 120mbps). I was surprised to have minimal change. Spouse's work laptop (Windows) does have ethernet, got a speed of 250mbps wired. 50 on Wifi, on the alleged 900mbps plan.
  - plemans
    Guru - Experienced User
    Apr 17, 2022
    How are you testing the speed?
    
    On the hardwired computer, try using xfinity's speedtest site.
    
    And if you have more than 1 computer you can hardwire in, try that one as well in case its a computer issue.
ko0jay
Aspirant
Apr 17, 2022
Exactly what I just did. Sold my C7100V and purchased a AX6000 to handle the speeds I wanted.
plemans
Guru - Experienced User
Apr 17, 2022
Your power levels look fine.

But you probably bought the wrong device if you're wanting close to gigabit speeds.

The C7100v isn't docsis 3.1 (only 3.0) compatible and xfinity's (and other isp's) have been pushing to require docsis 3.1 devices for lower and lower speed tiers. I'm impressed they even said they'd allow it for their 800mbps tier as ISP's like cox are requiring docsis 3.1 for anything 400+.

Also, you won't hit 400+ over wireless on that device. Only on wired.

One thing you can do is power off the modem and disconnect it from the coax. Give it a couple minutes and then reconnect the coax and boot it back up. Maybe xfinity didn't push the correct provisioning to it (or push it at all). Something to check on.
- RIRed
  Tutor
  Apr 17, 2022
  Thank you Plemans, I will try this.
  I had spoken with Xfinity several times since the upgrade; they reset my modem twice. Hopefully they would have noticed if the upgrade hadn't actually gone through?? OTOH my spouse's laptop got a speed test result of 250mbps over ethernet. Hmmm..... I may make another call today

Forum Discussion

C7100v compatible with Comcast 900mbps