MOTOROLA MB7621 Approved Spectrum Downloads

My Fellow PG experience Gives me the speed I am paying for and can go beyond, easy setup too..

I have xfinity performance pro which is rated for 150 mb/s down and 5 mb/s up. I've been using the Arris SB6141 modem which is 8 channel down x 4 channel up, great modem, no issues but it's speed maxed out at 120 mb/s down and 5 mb/s up. I figured what the heck might as well get the speed i'm paying for, so I purchased the Motorola SB7621 which is 24 channel down x 8 channel up. Internet speed is now 180mb/s down and 6mb/s up with a ping of 19ms. I am happy that I am now getting the speed I am paying for. Yes the upload speed didn't change much but that is because xfinity does not support 8 channel up in my area. This means even though this modem supports 8 channel up it only shows 4 active up channels when you log into it, this is not the modems fault, this is xfinity's doing. The download channels are fine, all 24 channels show up and are active. Yes, I could have purchased a 16 channel down and 4 channel up modem and received the same current speeds but at the time of purchase this modem was less than or the same amount as all the 16 x 4 modems. By buying this Motorola I can upgrade my internet speed down the road and still be covered. Another good thing is that this modem has the Broadcom chipset not the Intel puma.

The modem comes with good instructions and is well packaged. Setup was a breeze. I didn't have to call xfinity. All I did after I hooked up just the modem to my PC was navigate to motorola.com which brought up the xfinity activation page. Then just log in with your xfinity credentials and follow the prompts. Very easy and welcomed as I didn't want to sit on the phone talking to xfinity support.

I never do reviews but I figured this little box deserved one and hopefully this helps someone.

My Fellow Audiophile Headcase tell us Big Dissappointment -- Download Speed Dropped by 66% !!!.

This Motorola MB7621 cable modem was a huge disappointment. I bought it to replace my four year old Arris SB6141 which is a 8x4 modem. The MB7621 is 24x8 so in theory it should give better performance. However, the performance I saw was much worse than the older SB6141 with download speeds. I have Comcast Performance Pro 150mb service and was routinely seeing about 100mb in real life with the old modem. When I put this new cable modem on the coax the download speed consistently dropped to about 32mb. The signal levels all looked good and there weren't any uncorrected codewords. It appeared that 23 of the 24 available download channels achieved a lock. After spending several hours playing around with settings, etc, and chatting with Comcast "support" (useless) I had to assume that it was somehow defective. Back to using my trusty old Arris SB6141, hopefully for a few more years. I noted another reviewer also saw speed slowdowns on this modem. Even though it is listed as being Comcast Xfinity compatible it certainly did not work for me.

My Old Chap Paul S Talk If you're OK with Docsis 3.0 ... then this cable modem is fantastic and fast!.

This cable modem is a beast (in a good way)! A little over 7 years ago, I bought the Motorola SB6120 to replace the crummy cable modem that Comcast charged me monthly to use. I had no problems with the SB6120, but got an email from Xfinity saying I needed to upgrade my equipment. I guess because they have increased the speed on my service and the SB6120 is so old it may not be supported with updates from Motorola. OK...I paid $75 for the SB6120 and it probably saved me over $750 in monthly rental for 7+ years.
Decide first if you want DOCSIS 3.0 or 3.1 because the Docsis 3.1 is new and will probably be usable for years to come. Motorola only has 1 Docsis 3.1 cable modem available today which is the MB8600 and is almost twice the price of the Docsis 3.0 MB7621. If you compare the specs, the MB8600 is faster but at nominal 1000 Mbps and Comcast certified 400 Mbps, the MB7621 is way faster than my 150 Mbps service.
I got it today and got it activated and hooked up to my new Motorola MR1700 router. The process was fast and easy if you can figure what they are trying to say in the quick start guide. I activated with my notebook directly connected to the cable modem and the speed exceeded my 150 Mbps service by almost 30%. After direct wire of my notebook through the router, my speed was also exceeding my service speed at the same level.
The only way I can lose on this purchase is if Docsis 3.0 becomes obsolete in less than 8 months and I'll bet that is unlikely.

My Fellow Kristi Talk WARNING: buy at your own risk!.

I purchased two Motorola modems. One at a higher price for myself (MB8600), then this one (MB7621) for my sister. Mine went out for no apparent reason within 6 months. No storms, no lightning, no power surge, just surfing the web one minute, the next it's a brick. Had to go through such a pain to return mine for a replacement. A hold on my credit card until they received the fried one, had to wrangle with the warranty department since I didn't use it as a basketball, or mistreat it in any way. It just sits there on a desk.. really Motorola? I don't think it's just a freak thing that my sister's modem did the same exact thing within 3 months! Needless to say I was furious when told we would have to de-activate the borrowed modem from Xfinity, re-activate their modem so they could deem it useless, then re-activate the borrowed modem again.. then send the friend one back for a replacement.. so another de-activation and re-activation for a product that will probably fry again within a few months.. NOOOO! The most appalling thing was being laughed at while being told this by the customer service/warranty representative of Motorola when I called in, like it was completely thrilling for him to to be such a pain. Then his laughter got even louder and his tone changed to very condescending when I told him I would call Amazon and just get my money back for this defective item. He guaranteed me that I best do as he said because I would never get my money returned after having the item for that amount of time. Long story short.. THANKS AMAZON.. love y'all for refunding my hard earned cash so I can get away from this Motorola modem! I will NEVER own another Motorola product as long as I live!

My Old Fellow Charles Carr say Lightening Fast!.

I recently (about a month ago) purchased this modem to replace the 100mbps modem provided by Spectrum. We upgraded our service to a 400mbps because we have a gamer in the house plus about 14 connected devices on our wi-if. The MB7621 is rated to provide up to 1000mbps as oppposed to 100mbps that the Motorola SB6141 tops out at. Every speed test I have performed since activating has delivered 375-395mbps. The difference is remarkable! Note: With Spectrum, I had to call them up and lt them activate and register the MB7621. It took maybe 5 minutes.

My Old Chap Amazon Customer say setup was easy, and over the last few weeks its been ....

I'm using the MB7621 on an Xfinity Extreme 250 plan (250Mbps down/10Mbps up) as an upgrade from a SB6141.  I've consistently seen advertised speeds since installing this modem, setup was easy, and over the last few weeks its been completely reliable with no downtime.

My Old Neighbor Eric C. experience Defective unit.

First of all the unit looked like it was a return and I'm funny about that. But I hooked it up anyway. First two days I was raving about how easy the setup was and how much faster my Xfinity internet service was. And then on the third day we couldn't connect to the internet. Looked at the modem and all the lights were on solid which is never the case, even after I unplugged all wires but the power supply. Tried to reboot, reset, unplug and plug in again...to no avail. It just stayed lit and no service. Went to Walmart and purchased a different modem altogether and it's even faster, setup even easier, and it has not crashed at all. Don't know who should receive the blame, the manufacturer or the seller. But Amazon made the return easy so I appreciate that!

My Buddy Todd say I will recommend any Motorola Cable Modem after 17 years expieriance..

This is my second Motorola Cable Modem. My broadband internet provider, Charter at the time which I have been with for about 17 years now, provides a free of lease modem. I still have the one they issued me for my broadband telephone landline. But the one for internet didn't perform well and looked like junk so I purchased my first Motorola Surfboard because it had DOCSIS 3.0 and turned in the modem Charter issued me. Over the years my provider has upped their internet speeds and my first Motorola Modem always performed well. last year Charter became Spectrum and just recently my Spectrum upped my speed from 100mbs to 200mps free of charge, but I couldn't get the speed. I looked at the specs on my first Motorola and found it didn't have enough channels to go up to 200mps. I still have the old one and it still works great, but I purchased this one which does get over 200mps and will go up another 100 I believe. So long story short. Motorola has always been a great brand and having a higher DOCSIS and more frequency channels will get you all the speed your internet provider will supply.

My Fellow v2005t tell us Had to return..

This modem (MOTOROLA MB7621) drops the Internet connection periodically - between several times per day and once per a couple of days days. Don't know what causes this. When it happens, I have to reboot the modem - it does not recover by itself. Contacting my ISP and Motorola Technical support did not help to resolve the problem. The problem was resolved by replacing this modem with ARRIS SURFboard SB6183. No problems with ARRIS so far (after three weeks). Don't know if I got a faulty modem, or it is a firmware bug, or compatibility with my ISP (Optimum). Had to return it.

My Old Chap KMF said Excellent modem! Upgraded from the SB6120 after it started ....

Excellent modem! Upgraded from the SB6120 after it started dropping connections after 7+ years of use. Quick to get it up and running with Comcast's online activation. The bump in downstream channels was evident from the start, sites (appeared to) load more quickly and Speedtest noted a decent bump in download speed vs. the 6120. Upload is about the same, but that's to be expected. So far no complaints.