MOTOROLA SB6121 SURFboard Cable Modem RJ-45

I was thinking of exchanging this one, maybe just hoping that it was a bad batch or something but the installer said that he'd had problems with this model before. Never with it dropping the connection like it did, but taking forever during the initial...

The reviews from other users. Delivery from Newegg

This modem could not maintain its connection. When setting up the internet the modem would establish a connection (with all connection parameters within spec and looking really good), keep it for about 20 seconds and then drop it. My old modem worked...

I don't usually like Motorola, but I've got to hand it to them on this unit. I don't recommend the "upgrade" with the wireless router. Motorola should not be allowed to do WiFi. Instead I would recommend the TP-Link TL-WR1043ND (N82E16833704038)...

This is the best cable modem on the market. It just works, without trying to do anything else fancy

None

Make sure to check with your cable provider for a list of compatible modems, and then try to get the best modem from that list.

I upgraded from a Motorola I bought in 2003. For some reason, a couple years ago, my Internet slowed down considerably. I should have done something about it much sooner, but I was very busy and I wasn't sure what the problem was. At first I assumed it...

Nothing yet

Make sure its compatible with your internet service. If it is this is a great buy. Future capable with fast speeds and all the other details in the product spec.

Called Charter to make sure it works with their services and it does. So I bought it ; Future capable with Network Management: SNMP v2 & v3 ; Don't know if speed boost it advertises is true. My internet is 15 Mbps ; appears to run very stably and...

none so far. I keep mine in my tv cabinet so the lights dont bother me

It works ( was a bit worried there due to all the negative reviews) ; Does DOCSIS 3.0 + channel bonding ; Solid, reliable connection

No speed increases with DOCSIS 3 on CUMCAST

Quick and easy setup. The manual was clear and Comcast had no problem provisioning the modem to work with their service. Very happy that I no-longer need to pay the cable provider a monthly rental fee. My internet speeds have roughly doubled. I am...

No telephone port or Wifi. Not a problem with Motorola though; I chose the cheaper model and it lacked those ports. That is fine however

During heat tests (put it in direct sunlight) outside temperatures were 85F, but the speeds did not get affected nor did the stability. I ran this test for 30 days. The modem does get warm, but maybe an indicator. One day there was a connection issue....

So after purchasing this modem and running some tests, it appears that this is a great buy and safe guard for the future ; First, speed tests - using different servers around the country, this modem comes in around 23-25Mbps where I live. This is not...

The Surfboard 5100 I had; on top was a "standby" button which was a good feature. Now this SB6121 also stated that it had one on the front just below all the lights. Not anymore, the new revamped models being sold do not have a "standby" button. Not a...

Although the U.S. is far behind our over seas competitors (Korea/japan) in ISP Speeds this modem will allow us to be prepared for the higher tiered Docsis 3.0 channel bonding technologies we will see become revealed in the near future. Although I'd...

Hardware performing as needed; only limited by the ISP (comcast) ; Runs cool ; pretty lights ; will allow for future growth up to 171Mbps which will hopefully become a standard within the next few years which will leave us at 1/4 of what Foreign ISP's...

Doesn't serve pizza

There are other places that are cheaper then newegg but they have such a good turn out time.

Fast ; Stable connection ; Small size ; gives me the best speeds I have seen

None that comes to mind

Love it, i have CHarter 30mb service and speed test usually runs between 30-45mb ; there has in the past 2months only been 1 time iv had to do a "reset" of my router and modem, unlike when i had Comcast and their "rent-a-modem" which had to be reset...

it doesnt sing and make me waffels