New 1 Gb install - upload limited to ~85 Mbps

[ChrisFD2]

I had 1 Gb installed last week in an area new to VM. Regardless of whether in router or modem mode, upload very rarely moves past 85 Mbps. I've seen 90 Mbps occasion, but it's usually 75 -85 Mbps.

Tests conducted with cat6 cable directly into the hub if in router mode, or to my UniFi UDM if in modem mode. I've tried restarting, and I've tried a factory reset.

If I switch the WAN connection to use my Openreach FTTP 900/100 connection, using the same devices, cable, and NIC, I get 100+ Mbps upload every time.

The Samknows real speed also shows this behaviour.

I know ~20 Mbps upload 'missing' might seem petty, but I want to use VM as my main line and downgrade my FTTP to a slower package as a backup line. I run a fair amount of cloud backups, a site to site VPN etc, so the quicker the upload the better, and I signed up recently with the news that VM had bumped speeds to 110 Mbps.

As you can expect, trying to report this as a fault has been... challenging. Is there a mod who could look into this please? 

Thanks

[ChrisFD2]

It’s showing 104 Mbps, as does my VM account. 

[ChrisFD2]

[Client62]

Check the Hub's Upstream tab too please.  The limitation is the 87.7 Mb/s to the Hub, until this figure improves the questions about types of network cables or other IT kit are not at all important.

Take a look at the Upstream tab of the Hub, what does the Hub have connected as Upstream channels ?

To support the advertised 104Mb/s we might expect to see either :

1) 4x DOCSIS 3.0 channels at QAM 64 + 1x DOCSIS 3.1 channel
2) or 5x or 6x DOCSIS 3.0 channels at QAM 64 ( perhaps with out a DOCSIS 3.1 channel ) 

[ChrisFD2]

Thanks for your reply, this is what I see on the upstream tab. I'm guessing the hub doesn't have what it should have to support the full upload speed? 

[Client62]

So that is 4 DOCSIS 3.0 channels with about 27 Mb/s bandwidth each total to 108Mb/s, less in practice as we use a shared network..

If this is a Hub 5, they do not detail the DOCSIS 3.1 channel specs, VM forgot or omitted that in the current firmware.

On the Status tab is there an indication of number of DOCSIS 3.1 connected channels ? 
It might be a very simple grid that indicates 1x 3.1 Downstream and 0 or 1x Upstream DOCSIS 3.1 channel.

[ChrisFD2]

It's a Hub 5. When it was first installed the guy had a Hub 4 in the box even though Hub 5 was in the contract documents. I wanted the Hub 5 as I have 10 Gb capable network, and wanted the 2.5 Gbps port. So he swapped it out before connecting.

Not sure how this will format, this is the status page:

Cable Modem Status

Item Status Comments

Acquired Downstream Channel(Hz) 171000000 Locked

Ranged Upstream Channel(Hz) 46200000 Ranged

Provisioning State Online Operational

[Client62]

Looks like the presence of the 3.1 channels is buried in the Logs of a Hub 5.   

Below is clip from an earlier Hub 5 post ... thank you to chrcoluk for spotting this.

Open network log page.

For downstream

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;

For upstream

US profile assignment change. US Chan ID: 10; Previous Profile: 13; New Profile: 11 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;

[ChrisFD2]

I only see an entry for DS, no US entry. I've just done another factory reset, still no US in the log.

[ChrisFD2]

[Jonny-M]

I don't think you have enough upstream channels to ever give you the speed that VM have said your service tier is provisioned at.