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The upload speed is correct for the Blast 250/10 speedtier. When you only get around 90 down on the faster speed-tiers it sometimes means that the port negotiation is only 10/100 rather than a 10/100/1000 (gigabit) negotiation. Is there a router in the mix here or is this with a computer connected directly to the modem ? Is that a cat5 or a cat5e ethernet cable ? Does the computers NIC / network adapter card have a gigabit capable port ?
I don't see your modem on the list of Comcast approved devices - how long have you had it, and is this a rental, or do you own it?
If using windows what does it say in the Network and Sharing screen when you click on ethernet for the link speed? You could try changing the properties from auto negotiation to 1 Gb, just a thought...
I appreciate all the help!!! The only reason I purchased it, was knowing it was on the approved list. It was on this list, at one time for sure. I purchased it about 3 years ago... I think. I have tested with with 2 laptops and 2 desktops. All plugged straight into the modem. My personal pc’s motherboard is a MSI z87m. It has 1 port 10/100/1000. I’m using cat 5. If anything on my end, I feel this could be the problem... thoughts?
It could have been on the approved list at one point, but I don't see it on the legacy site either, and that even includes ancient DOCSIS 2.0 modems. This product page on Amazon not only doesn't show Comcast as an approved ISP, but reviews show inconsistent, mixed results with Comcast. If it's not on the supported list, it's going to be hit and miss as you may not get a proper modem configuration file, for one.
If the new CAT 6 cable doesn't solve the problem, you may be better off investing in a new modem. But hopefully, the cheaper fix wins out.
That's a long time for a modem to be around, time to put that old racehorse out to pasture
There's a lot of good modems out there (and sadly some pretty awful ones), but for your speed tier, I would absolutely go with an ARRIS SB6183, : Comcast supported, rock solid, dependable, plus a two year warranty.
You're on the wrong track there, the device is still very much approved and on the list, good for Extreme 300.
It's a D3 16x4 modem.
Similar to the 6183 and came out around the same time if I remember correctly and slightly cheaper.. May not be as popular.
If it's not on the supported list, it's going to be hit and miss as you may not get a proper modem configuration file, for one.
FWIW, the config file seems to be correct since the upload speed is correct (why I asked). But there still could be a provisioning / database issue in the back end system that may only affect the download speed. These days, the config file doesn't directly control the end speeds at the modem like it used to. It now points the modem to different service flows on the CMTS configuration.
I just tried my new cat6 cables.... same result.... on both laptops and my desktop. I am at a total loss... suggestions?
Version:1.0 StartHTML:000000184 EndHTML:000005290 StartFragment:000000672 EndFragment:000005219 StartSelection:000000679 EndSelection:000005219 SourceURL:http://192.168.100.1/ Modem Login
Those stats are in spec. Try calling 1-800-comcast and ask a rep to *roll and re-provision* the modem. Also ask them to confirm that the provisioning and account data in their database is correct and complete and that the correct configuration / bootfile for your subscribed to speed tier is being pushed to the modem.
You may have to ask for a "Tier 2" rep.
I did notice that Its still running firmware v1.0 I looked for an update on smc website... couldn’t find anything
Firmware does not control the speeds.
Only Comcast can update a modem's firmware.
Forgive me, it was hardware v1.0 So I did a hard reset. Same results. Looks like a call to comcast with your info/suggestions is in order. TY all for all of your helpful suggestions!!!!
Good luck ! If you don't get any satisfaction from a Tier 2 phone rep, I will escalate your issue to one of the Comcast corporate employees that are available to these boards.
got a new modem... 6183
on ookla 300/12
on all other speed test sites 220+/11
but on xfinity speedtest... im still the same speeds... the old 90/12
all tests were run thru my new modem and same old router.
Looks like it was my old modem... wonder why testing on Xfinity site is soooo much slower?
Good to see you got a new 6183 - have you tried checking the Xfinity Speed test server under Advanced Settings to make sure it's reasonably close to you?
Sure, I test Pittsburgh which is the closest and then I tested two different servers in Virginia and they’re all relatively about the same speed
Sounds like a local issue. I am in the Houjston area and my Xfinity speed test is almost the same whether I use my nearest location or Seattle.
Did you do both IPv4 and IPv6? There was some difference using Seattle.
so... my internet connection is back to about 290/12 everywhere except comcast's own speed test site... its about 100/12. My Tv is all fixed too. They replaced line from pole to house on monday, then today, replaced all wires inside the house and installed a new set-top box. All tv functions are as should be. Pings are good for gaming, as they were before any problems, with 0 packet loss. I fully believe that no lines needed replaced, outside or inside. Just my tv box... I think it was cooked or out dated.
Heres my modems readings:
Version:1.0 StartHTML:000000184 EndHTML:000005883 StartFragment:000001304 EndFragment:000005784 StartSelection:000001331 EndSelection:000005780 SourceURL:http://192.168.100.1/Status