I have been doing some research but its impossible to find out a straight answer.
I am having an issue with speeds on my new SB6121 modem. I purchased it and hooked it yesterday; I called Comcast to activate it. Once they activated it I ran speed tests but I can never get anything higer than 25 Mbs. That is the exact same speed I was getting with the rented modem from Comcast which is DOCSIS 2.0. The modem is showing that it is bonded with upstream and downstream (the lights are blue)
My father who lives in the same area as me has the SB6121 and is pulling 50Mbs with no issues at all. I also made sure I have the BLAST! internet service which I do and in my area is rated at 50MBs download.
I have a trouble ticket in and someone should be calling me tonight around 7PM but I have a feeling they won't be able to get it working. I was on the phone last night for over an hour with two different people who said "give it time".
Well I "gave it time" and ran a test this morning on speedtest.net and still I still am not getting anything above 25 Mbs. Now I am thinking maybe since I have not yet returned the old modem, when I look in 'My Account' > 'My Devices', I see both the Arris rented modem and my Motorola SB6121 that there is a conflict? Maybe they didn't set it up properly?
Just curious.... Are you using a router with that? if so, which one?
I have the same modem, but have not finished my set up yet as I need a new router. Just ordered a cisco 4500. I tried is with my older trendnet, but the trendnet was not up to the task and was having hardware issues. In the meantime I put in the comcast arris modem/router last night and am getting the speed I am supposed to. I only signed up for the 20MB package and am getting 20-30 down and about 5 up.
The tech said the motorola was fine when he was here.
Remember cable speed also depends who is on the cable line with you too - your neighbors, etc. and how far down towards the end you are. (or at least it used too).
When you look at your account are both modems activated? I show two as well, but only one is active - the other is grayed out. I talked to the tech this AM and he said each active modem is associated with a separate account. One modem per account.
I initially had the modem plugged directly in to the computer because I thought "maybe my router is causing a bottleneck." But it makes no difference in speed when it is plugged in to the router or directly in to my computer.
Just a note I hard wire my computer to my wireless router. Which is a Linksys E2000.
I took a screen shot of my devices. Does anything look off here? It looks like neither one is grayed out:
Thats weird because the Motorola is hooked up currently and I have access to the internet which means that the Motorola is active right? I thought the question mark meant there was no picture associated with that device.
Just got off the phone. The lady yesterday did not set it up properly. She added a speed boost for 10 dollars extra to my account. The guy I spoke with was like "oh no wonder why" 5 minutes later I am hitting 52MBs on speedtest.net.
I don't know why but it's like sales doesn't talk to the people who implement upgrades. Every time I've upgraded I've had to spend about an hour on chat with tech support who eventually figures out that their settings were not configured correctly. Seems horribly ineficient.