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Modem Connection Issues

chuglyfe
Regular Visitor

Modem Connection Issues

Hi all,

I am having a lot of brief connections drops from my modem throughout the day. I have a MOTOROLA 8x4 Cable Modem, Model MB7220, 343 Mbps DOCSIS 3.0 and experience the issues we wired into my router or the modem. The event log is full of " Unicast Ranging Received Abort Response " and " 6 consecutive T3 timeouts while trying to range on upstream channel " errors of the like.

My downstream power is 2.2-2.4 dBmV, SNR 42.5-42.6 dB with many uncorrected packets. The upstream is 39.5-40.7 dBmV. It's my understanding that the upstream could be a bit low and causing the problem. The line from the pole comes to the house and only has one splitter before coming to the modem. It's a GE Digital 2-Way Coaxial Cable Splitter, 2.5 GHz 5-2500 MHz.

Here are some images of what the modem status page looks like. Any ideas? I've tried the usual restating/checking cables/replacing splitter.

https://imgur.com/a/79k7AgH

EG
Expert

Re: Modem Connection Issues

The signal stats are good. The first thing to try is swapping out that splitter. It is engineered for satellite systems, not cable systems.  It can actually make performance worse by allowing line noise ingress at those higher frequencies that cable systems do not operate on.

 

Here are some quality brand splitters that Comcast actually uses in different market areas;

Antronix CMC2002H 2-Way Splitter: http://www.amazon.com/Antronix-CMC2002H-2-Way-Splitter/dp/B001E4OH1E

Regal 2 WAY 1 GHZ Splitter: http://www.amazon.com/DIG702867-Regal-WAY-GHZ-SPLITTER/dp/B0018BQMUM/ref=sr_1_2?s=electronics&ie=UTF...

Extreme Broadband BDS102H 2-Way Digital Coax Splitter: http://www.amazon.com/EXTREME-DIGITAL-PERFORMANCE-CABLE-SPLITTER/dp/B007YV0UQW

Holland 2-way horizontal splitter 5-1000 MHz with ground.http://www.3starinc.com/holland_2-way_horizontal_splitter_5-1000_mhz-w-ground.html

Sv-2g 2-way Splitter 5-1000mhz: http://www.amazon.com/Sv-2g-2-way-Splitter-5-1000mhz-Sv2g/dp/B003TH36CK





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chuglyfe
Regular Visitor

Re: Modem Connection Issues

Hi EG,


Thanks for the advice, I went ahead an ordered one should be here today, I will update after installed to see if there are still errors.

EG
Expert

Re: Modem Connection Issues

Bear in mind, I mentioned that *as a place to start*. No guarantees. YMMV. The problem may very well lie somewhere else. Good luck !



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
chuglyfe
Regular Visitor

Re: Modem Connection Issues

It seemed to have made the problem worse. Only installed for a few hours and I have many more errors.