SB6141 modem speeds slow than expected (May 2022)

My customer owned SB6141 is no longer on the supported equipment list but it seems to me my bandwidth was much higher back in the day now I only get 120 Mbps speed tests on a desktop computer connected via Cat5 Ethernet cable. I have 300 Mbps service and Xfinity says my modem is capable of 284 Mbps. Modem signal page shows 35-38 for all downstream and upstream channels. I'm obviously not expecting gigabit bandwidth but I think I should be able to get better speeds with my existing equipment. Any suggestions would be very much appreciated.

Responses

BruceW

Gold Problem Solver

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26.3K Messages

3 years ago

... SB6141 ... I only get 120 Mbps ... 300 Mbps service ...

Using devices on speed tiers for which they are not approved, and using devices that are no longer approved, tends to produce unexpected results, often speeds well below the manufacturer's rating. You need to pick one of the modems on the "Devices" page that is approved for the 300 Mbps speed tier or drop back to a lower tier.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

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user_f32d9c

Visitor

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5 Messages

3 years ago

Thank you for the reply. I should have stated my question better. Did Xfinity throttle DOCSIS 3.0 modems after they became no longer approved so they operate a slower speed than they are capable of? The only reason I'm even investigating this issue is my family members have been complaining where they never had before.

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XfinityBradM

Official Employee

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915 Messages

Hey there @user_f32d9c. We can definitely understand how stressful and irritating it is to have issues with your internet connection. We all work from home on this end of the screen so we can completely relate to how it causes you to make arrangements that you didn't expect. You mentioned you were using Cat5 ethernet cable and wanted to point out if it is not Cat5e (enhanced) the maximum theoretical speeds that kind of cable can handle is around 100 Mbps. In no way do we throttle speeds for modems that make it to our end-of-life list, however, the previous user's comment was spot on when they mentioned if you're not using an approved device, results will vary as to what you receive.

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3 years ago

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user_f32d9c

Visitor

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5 Messages

Based on the spot-on advice I was given initially, I purchased a new approved DOCSIS 3.1 modem and my speeds stayed exactly the same. I then purchased a new WiFi6 router and am now getting 340Mbps over my existing Cat5e cabling. I would have expected a "just get an approved modem" response if I had opened a support ticket with Xfinity, so I was hoping for some real troubleshooting advice from a community member. For 300Mbps service, I probably could have used my existing DOCSIS 3.0 modem and saved the $150 that I spent on the modem.

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3 years ago

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CCMiguel

Gold Problem Solver

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358 Messages

Hi! Thank you for taking the time to send your concerns on this platform about your speed and equipment concerns. I know how important it is to have a consistent connection. Have you checked to see if you have any splitters connected to the coax cable line? Do you always have these concerns on a hardwired or wireless connection?

I no longer actively support the Xfinity Forum or work for Comcast.

3 years ago

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Your Home Network

user_f32d9c

SB6141 modem speeds slow than expected (May 2022)

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

user_f32d9c

XfinityBradM

user_f32d9c

CCMiguel

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