troutt's profile

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Sun, Dec 20, 2020 7:00 PM

Upstream bonded channels unlocked

We just switched from the rentable Comcast modem to the Motorola MT7711 modem router combo. Paying for gigabit download and 35 Mbps upload speeds. The new modem is compatible with Xfinity and has gigabit download speeds and up to ~250 Mbps upload speeds. Our down is averaging ~400 Mbps on ethernet. Upload is averaging 4 Mbps on both ethernet and wireless.


The Xfinity brand rentable modem had the same download speeds but reached an average of 40 Mbps upload.


I was checking the connection and all downstream channels were locked (24 total). Upstream channels only had 5 locked and 3 unlocked, completely unused (8 total).


Is there a reason three upstream channels are unlocked? Is the new modem/router the reason there is a discrepancy between what we are paying for in upload speed and what we are getting?



Upstream Channels

 ChannelLock StatusChannel TypeChannel IDSymb. Rate (Ksym/sec)Freq. (MHz)Pwr (dBmV)
6Not LockedUnknown0000.0
7Not LockedUnknown0000.0
8Not LockedUnknown0000.0





86.6K Messages

5 m ago

That's all they offer is 3 to 5 upstream channels..


The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.


And you'll never get gig speed with that device. It only supports DOCSIS 3.0. A DOCSIS 3.1 device is required.

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