1) It's Comcast, hard telling what they are doing. The SB6120 is up to 4 times faster than DOCSIS 2.0 broadband cable modems making it capable of reaching data rates up to 150 Mbps. I'm connecting using dhcp. Seller 100% positive. Condition is "Used". Unlocked. The modem has a built in DHCP server. Device and power adapter only. I was getting downloads of 19 Mbps and uploads of 3.1 Mbps. … The SB6121’s higher-speed services enable operators to: • Protect their installed base of high-speed data customers • Deliver high-bandwidth, multimedia services • Deliver competitive, high-capacity commercial services to their business customers. Page 1 Once consumers have experienced broadband powered by the Motorola SB5101 cable modem, they’ll never want to go back to dial up again! Is this something that needs to be pushed from Comcast themselves? I had the same modem for 5 years (Motorola SB5101). Motorola Arris Surfboard Sb6121 Cable Modem. I was stuck at 0.54Mbps (no not a typo). However, I can't modify it and I don't like the ip configuration it uses. I consistently pull around 80 mbps down and 25ish up. Motorola sb6141 slow speeds ultimate tier. It harnesses the power of DOCSIS 3.0 technology to bond up to four downstream channels and four upstream channels— providing you advanced multimedia services with download speeds up to 172 Mbps in each direction. 4 user comments. Many of today’s devices such as the smartphone, security cameras, tablets, computers, game console and HDTVs uses the n, g and ac wireless standards for internet and wireless access. I have that Motorola SB6121 modem which was on their approved list, and the technician isolated the problem to the modem. I had Blast Pro for a while, and was maxing out my old Motorola SB6121 at ~170mbps. It also Still same very slow 2.4 ghz speeds happens intermittently. These values are absolutes. Page 2 Motorola, Inc. 101 Tournament Drive, Horsham, Pennsylvania 19044 U.S.A. www.motorola.com MOTOROLA and the Stylized M … My next step will be to swap out my neighbor's cable modem with my own to see if that makes any difference. To do so you you will need to Access the Cable Modems Administration page please use the User Guide {Here} for any questions regarding this. Again, you want to eliminate everything but the Modem. $8.00 0 bids + shipping . Hello everyone, I have the starter tier business service. Either way these lights need to be blue to get the speeds being advertised by the provider. This guide provides product overview and setup information for the SB6121. We replaced it for a new one and the speeds increased dramatically to ~55 Mb/s down and 6-7 Mb/s up. Does anyone know if they normally push updates? It depends on what speed your provider gives you. You need a Spiceworks account to {{action}}. It has often been tied to negotiations (duplex and speeds) or quality of equipment. n%ƒçoŠÑè^G2ø‡²îigÍ¡¼¨{ c8ÛTåž40ùtM ‹|u³3æùjyG뼂eQ”´l÷i³¿‚ͪ©ÒÁÉ. The SB6121 delivers your complete personal media experience, at incredible broadband speeds. Either way these lights need to be blue to get the speeds being advertised by the provider. With the power and speed of the Motorola SB5101 cable modem, consumers will be surfing the web like never before. With that said you should perform speed tests while directly connected to the lan port of the modem itself - that is, do not test while connected to a router that sits behind the modem doing so you eliminate all possibilities of anything else but the modem and perhaps the pc that is doing the testing. Has anyone ever heard of Motorola cable modems having these kinds of issues? ... Motorola Arris Surfboard Sb6121 Cable Modem. Given the above, would a new modem achieve faster download speed ? I'm trying to troubleshoot slow cable modem speeds, Getting 25mbps out of the advertised 100mbps on a  regular basis, Comcast has arrived and tested out the line only to tell us that the line is working perfectly fine. The Motorola SURFboard SB6120 extreme Cable Modem unleashes the next wave of broadband technology at exceptional speed. I tested both modems today and I got 60 down on the 6120 and I only get 27 down on the 6141. Motorola Surfboard Modem Suddenly Can't Use With Wireless Router? When I do "speed tests", depending upon the server (I tested 7 servers), my download speeds range from 75 to 95. I know this thread is pretty old, but after a weekend of banging my head trying to get this resolved. $14.00 + shipping. I purchased a Motorola SB6141 on Amazon to replace my SB6120, however I'm getting slower speeds on the 6141. I just switched from dsl to cable modem using motorola 2b6141 and my 4th generation time capsule as my wireless router. The SB6120 is the ideal competitive solution for the high-end residential user, the small home office owner, as well as the medium to large business enterprise. Are you directly connected to the modem itself? I ended logging into the modem and hitting "Restore Defaults" and then "Restart Modem" and I've had lightening fast speeds ever since. Seller 100% positive. Dread Prime over 7 years ago. Power cycle the unit by disconnecting the power cord for 10 seconds, then reconnect the power cord. Changing duplex settings on the routers did not improve his performance, but replacing the modem did. I have tried all of the attached steps and the problem continues. If the cable modem is experiencing levels that approach the minimum or maximum acceptable levels, then it is a warning sign that there is a possible cable plant issue. ISP kept blaming the router, but I gave him the testing info I actually did so he had leverage to replace his modem. I also have a new Windows 10 laptop. Another example I worked on: Friend of mine has 20 Mbps/1Mbps through cable provider, 1) His router on his modem gave 1 Mbps/.5 Mbps2)  His router at my house was 20 Mbps/1Mbps (same ISP and service as he has, just at my house instead) 3)  My router as his house gave 1 Mbps/.5 Mbps. I recently purchased the WRT 1200 AC wireless router to complete my in-home wifi. Both of these lights should be BLUE in your case, if not something isn't configured right - either the cable modem doesn't have the correct DOCSIS 3.0 configuration file loaded which is sent from the provider itself. Both of these lights should be BLUE in your case, if not something isn't configured right - either the cable modem doesn't have the correct DOCSIS 3.0. file loaded which is sent from the provider itself. $8.00 + shipping . FOR SALE - San Francisco and Bay Area, CA - Motorola SB6121 SURFboard High Speed Cable Modem DOCSIS 3.0 Location: mountain view Price: $10 Motorola SB5100 Modem / Linksys WRT54G2 Router - Internet Speed Slow? I have Comcast Xfinity blast cable internet service and am supposed to … I just got set up the other day (also have SB6121) and I was barely able to load this forum page and like many other's experience, Comcast is near useless.. They could be throttling your connection because of non-standard equipment. Motorola SURFboard SB6121 DOCSIS 3.0 High-Speed Cable Modem. Hi I recently upgraded to the ultimate tier but have only been getting roughly half the advertised speed. The Very top Light on the modem is the Power State (green is on) The next 2 lights are your receive downstream, send upstream lights respectively. Motorola Inc, 101 Tournament Drive, Horsham, PA 19044, 1-215-323-1000, declares that the SURFboard® SB6180 DOCSIS® 3.0 Cable Modem complies with 47 CFR Parts 2 and 15 of the FCC rules as a Class B digital device. Why do you need the Motorola MG7550 High-Speed Cable Gateway? The firmware is a couple years old now and I have been unable to find any form of updates off of Motorola's web site. We have this issue at various Comcast Business-Class sites. He said a discussion forum he reads shows a lot of people reporting slow speeds with this modem (and some of it's sister models) after 1-2 years of use. For example, I was looking at the ARRIS/Motorola SB6121 model, which is rated by the manufacturer for download speeds up to 172Mbps , whereas it's only rated 50Mbps by TWC . When I plug my laptop directly into the cable modem, the speed is ~30mbps. With a PC connected directly to the Cable Modem you can access the administration page at http://192.168.100.1. It wasn't failed, but just very slow. You can use your high-speed cable modem to directly connect one computer in your home or business to the Internet. The next door neighbor's connection is getting 60mbps+ out of the advertised 100mbps. Is there a setting that may need to be configured on the cable modem? Consistent but slow speeds since upgrading to Gigabit. One Easy Check is to see if the Modem has established Bonded Upstream and Downstream Channels - with the providers CMTS (Cable Modem Termination System). The Motorola ® SURFboard SB6121 DOCSIS® 3.0 Cable Modem provides high-speed Internet access to the Internet and other online services. It has no options that I can modify. We are using the Comcast provided modem. The Moto x4 does not display these intermittent issues and it also has 2 to 3 x times the wifi downlaod speeds of the G6 all the time, I do not think this is normal or expected that G6 has these issues. Economic and Flexible. Next check your cable modems signal/power levels. Only a few times have I gotten a speed test over 100. Motorola SB6121 Surfboard Cable Modem Black. ISP got it fixed, but based on the way he talked, he just had to argue enough for them to realize there was some config problem on their DSLAM. All DOCSIS cable modems require that the RF signals fall within a very specific range to be an acceptable level for the modem to operate properly. All DOCSIS cable modems require that the RF signals fall within a very specific range to be an acceptable level for the modem to operate properly. I am not getting the speeds that I signed up for (25)..getting more like 4-5 dowload even if I turn the time machine off. Strange speed test results with Motorola SURFboard SB6121 DOCSIS 3.0 cable modem. After having my new Moto SB6121 provisioned yesterday, I only get 24.08/1.37Mbps. Free shipping for many products! Launch a web browser, such as Internet Explorer, Firefox, or Safari. $25.00 + shipping. However, since upgrading and installing the new modem, I am consistently getting a steady 95mbps. Or something isn't configured properly on the CMTS. We have a  Motorola SB6121 Cable Modem  - which we purchased off of Amazon and is relatively new. I tried changing duplex and speeds on this scenario and couldn't get much different results. But with the WRT 1200AC attached, I'm lucky to … Cable Modems Administration page please use the User Guide {, With a PC connected directly to the Cable Modem you can access the administration page at. With Green indicating a NON-Bonded Channel and Blue indicating High-Speed Bonded. Shipped with USPS Priority Mail. Motorola SURFboard SB5101U Cable Modem + Cisco Linksys E2500 N600 WiFi Router. Any suggestions? The Motorola MG7550 is a combination of a high speed wireless router with AC1900 WiFi and Power Boost. If motorola usb cable modem drivers sbv5121 turns bad a large number of side effects can become evident, not the smallest of which can be a slow or faltering net relationship. In short, unless you are a power user that pulls one of your providers top-tier internet speeds (Over 160 Mbps down), you won't notice the difference. NOTE: If the SB6121 is connected to a router, it is recommended to disconnect the router and connect the SB6121 directly to a computer with an Ethernet cable. He said a discussion forum he reads shows a lot of people reporting slow speeds with this modem (and some of it's sister models) after … I have a number of examples, but here's two: One example I personally have worked with: Customer pays for 80 Mbps/80Mbps: 1) My laptop connected directly gave 80/802) ASA 5505 connected directly gave 60/103) Netgear $30 switch Gigabit from Walmart between my laptop and ISP gave 15/104) Netgear Business Switch Gigabit between my laptop and ISP gave 80/80. Granted, I didn't contact the ISP to have them make setting changes on their end. Now I'm up to 40-50Mbps. I don’t know that particular modem or Comcast’s connection specification, but there are several different signalling standards used for ISP connections, and several different protocols used over the ISP connections. Or something isn't configured properly on the CMTS. Find many great new & used options and get the best deals for Motorola Arris SURFboard Cable Modem SB6121 Broadband Speed Modem at the best online prices at eBay! Motorola SB6121 SURFboard High Speed Cable Modem DOCSIS 3.0 CHARTER WOW WAVE. 2) You aren't using their equipment, which you probably will want to try first. Jefffinn - Which modem did you end up replacing your SB6121 with? We have tried two different wireless routers to see if that could be the issue , but didn't have any luck. I am still convinced the modem had some kind of port issue going on. The Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem provides operators with an economic option for providing … One day this issue just started out of the blue. The modem I have is a Motorola Surfboard SB6121. You should take that and test it as well on a known working network which runs close or near it's advertised speeds. Nov 15, 2019 - Arris Motorola SB6121 SURFboard DOCSIS 3.0 High-Speed Cable Modem Comcast Xfinit In many cases, rebooting the modem brings the service back to our subscribed rate. First make sure you have an approved device: That Motorola SB6121 (retail version) is on their approved list. Motorola SURFboard SB6121 overview and full product specs on CNET. These levels apply to all Motorola cable modems and cable modem/gateways. In addition, the ARRIS/Motorola SB 6141 model is rated by the manufacturer for download speeds up to 343 mbps , whereas TWC rates it at 100 mbps . Motorola usb cable modem drivers sbv5121 driver Comments: 5 out of 5 based on 1 ratings. I hope that we’ve been able to help you fix your Motorola Moto G7 that’s running slow. Downstream Power Level (DPL): +15 to -15dBmV. I had TWC come out and check everything and it's up to spec. I'd like to know why this has been occurring a lot lately. I have an airport extreme and apple tv on the network. With Green indicating a NON-Bonded Channel and Blue indicating High-Speed Bonded. If the cable connection at the modem is OK, then it is advised to contact the cable operator to address the issue. After installing the new modem (SB6121), I am getting downloads of 30 Mbps (a 50% improvement) and uploads of 3.7 (not as much, but still an improvement). With the rental SMCD3G, I got around 30 Mbps download and 3Mbps upload. The next 2 lights are your receive downstream, send upstream lights respectively. I recently upgraded to Gigabit and got a new Motorola MB8600 for it (purchased on my own). These values are, 30 dB or greater (if 256 QAM and DPL = -5 to +15 dB), 33 dB or greater (if 256 QAM and DPL = -6 to -15 dB), 51dBmV or less (3 or more downstream channels). With Motorola’s cable modems, high-speed Internet access has always been at your fingertips – always on and always connected. I have not seen these type of wifi speed issues on the g5+ , g5s+ or moto x4. I was getting very slow internet speeds of ~5 Mb/s down and ~ 1 up on a 50 Mb/s. These levels apply to all Motorola cable modems and cable modem/gateways. I highly recommed this product. I have seen this a number of times with ISPs providing higher speeds. I actually did about 15 to 20 tests, and it all boiled down to the equipment I had connected. I don't normally post a lot to forums but I wanted to share our story so it may help others. Even though everyone at the provider said he should get 12 Mbps he was getting terrible and inconsistent performance. The 121 can only support speeds up to 161 Mbps down, while the 141 will support up to 300 Mbps down. My current modem is a Motorola SB6121, specs say it can handle maximum of 195Mbs for downloads. I have that Motorola SB6121 modem which was on their approved list, and the technician isolated the problem to the modem. While wirelessly connected to the network I have run the Comcast Speed test. Also, a buddy of mine had some problems like this with his DSL service.