Rookie

Upload not Reaching Expectations (200/20)

Hi,

 

I recently moved to Raleigh and purchased the Extreme 200 plan in hopes of obtaining a 20Mbit peak upload speed as advertised as I use a lot of cloud backup software.

 

I have been unable to get over 6Mbit upload speeds which is a bit disappointing and I am trying to understand why.

 

Here is my speed test: http://www.speedtest.net/my-result/5489520506

 

Here is a dump of the Status from my new Surfboard 6183:

 

Status

The statuses listed show the connection state of the cable modem. They are used by your service provider to evaluate the operation of the cable modem.

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel Locked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+
DOCSIS Network Access EnabledAllowed 

 
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1LockedQAM25617555000000 Hz-1.3 dBmV39.9 dB160
2LockedQAM25618561000000 Hz-1.3 dBmV39.9 dB110
3LockedQAM25619567000000 Hz-1.1 dBmV39.8 dB140
4LockedQAM25620573000000 Hz-1.3 dBmV39.7 dB190
5LockedQAM25621579000000 Hz-1.1 dBmV39.8 dB130
6LockedQAM25622585000000 Hz-1.2 dBmV39.6 dB110
7LockedQAM25623591000000 Hz-0.8 dBmV39.7 dB70
8LockedQAM25624597000000 Hz-0.8 dBmV39.7 dB110
9LockedQAM25625603000000 Hz-0.4 dBmV39.8 dB80
10LockedQAM25626609000000 Hz-0.1 dBmV39.9 dB80
11LockedQAM25627615000000 Hz0.3 dBmV39.9 dB100
12LockedQAM25628621000000 Hz1.0 dBmV40.1 dB170
13LockedQAM25629627000000 Hz0.9 dBmV40.0 dB190
14LockedQAM25630633000000 Hz1.0 dBmV40.1 dB150
15LockedQAM25631639000000 Hz1.1 dBmV40.0 dB200
16LockedQAM25632645000000 Hz1.1 dBmV39.9 dB130

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedTDMA12560 Ksym/sec19400000 Hz50.8 dBmV
2LockedATDMA25120 Ksym/sec24200000 Hz52.0 dBmV
3LockedATDMA35120 Ksym/sec30600000 Hz53.3 dBmV
4LockedATDMA42560 Ksym/sec37000000 Hz53.3 dBmV


 

Current System Time: Tue Jul 19 19:44:45 2016

 

 

From what I saw elsewhere it seems like my upload powers may be high. I tried tracing back the cables in my apartment and it appears they likely branch off somewhere in my attic, possibly through a splitter.

 

Does anyone have any ideas what may be causing this?

 

Thanks,

Trent

7 REPLIES 7
Spectrum Employee

Re: Upload not Reaching Expectations (200/20)

Are you measuring this on wired or wireless?

 

Wireless can have a lot of extra varibles, need to try to measured wired and directly connect to the modem, if possible.  I discovered what I though was an upload issue on my own system once and then realized it was actually an upload QoS rule I had set in my Nighthawk router that was throttling my upload.

 

Step one is to measure right from the source, the modem.  Need to use a gigabit ethernet jack as well, as ol' school 100 Mbps "fast ethernet" NICs can only go... well... up to 100 Mbps.

Same is true for WiFi, but that is more much more complicated (start simple, with the basics)

Spoiler
(usage %, co-interference, neighboring-interference, non-802.11 interference, and most importantly for WiFi, the protocol max speed each wireless NIC is capable of in each device connected to that 2.4 GHz or 5.0 GHz network)

 

  • If  you could share make(s) & model(s) of your router & modem, or router-modem combo (called a "gateway modem" technically) that would help this discussion tremendously.
  • If you could share the error logs that would also help the community discussion tremendously.

 

This I can say from what you've already shared:

  • Your voltage levels are just fine on the downstream/forward.  You don't have an issue.
  • Your upstream/return power levels are too high for my liking, >52 dBmV can certainly start to see issues.

    This could be a combination of two issues, but I would help to examine the LAN very carefully first, because that's the probably the bigger issue, and one you can control. The upstream being too high could easily be a maintenance issue for you and your neighbors, but it's no so far out of range as to be explaining everything you're describing as an issue (there's likely more to this than that), so it's imperative the LAN is troubleshooted as much as possible first, agreed?

 PS:  I personally also have a SB6183, it's a rather reliable modem model #.  You can see the error logs under the "event log" tab at the top, in the same 192.168.100.1 location as where you found the signal levels.

My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Rookie

Re: Upload not Reaching Expectations (200/20)

agentx5

 

Thank you so much. I did not realize that the R7000 Nighthawk would throttle the upload to exactly whatever the upload speed was set to even when the actual peak was higher. My old place I had 6Mbit up so my QoS was set for 6Mbit up which is conveniently the exact amount I was getting in my speed tests.

 

To my uneducated on how QoS actually functions mind that seems a little silly to forcibly throttle something to that peak at all times even when it is on the device set to the highest priority but I guess that was the issue.

 

Thanks!

Spectrum Employee

Re: Upload not Reaching Expectations (200/20)

Is it solved then?  You literally have a R7000 Nighthawk like me? No joke? Smiley Very Happy

 

If you solved the primary issue with upload speed, can you also re-share your upsteam/return power levels?

Spoiler
Note:  It's harder in the summer for signal levels because of the heat can raise the resistivity of the wiring up a few ohms, which means the attenuation (signal loss per distance) goes up and you modem has to "push" harder to get its transmission back upstream.  Hopefully that makes sense.
My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Expert

Re: Upload not Reaching Expectations (200/20)

Your upstream is above +52 dBmv and

is out of range/ out of spec and won't work.

You have either too many splitters or corroded connections or open splitter ports.

 If you're internet only, the modem must be direct connected to the outside grounding block.

.

 

Spectrum Employee

Re: Upload not Reaching Expectations (200/20)

The +53.3 dBmV is indeed out of spec, yes; but it should work on a SB6183.
It's just not ok to leave it like that (too high, needs some fixing)

Bear in mind this is also a peak time of the year for higher return and low forward signal levels, because of temperatures outside (that said, also a good time for getting repairs done, if needed)

My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Helper

Re: Upload not Reaching Expectations (200/20)


@agentx5 wrote:

The +53.3 dBmV is indeed out of spec, yes; but it should work on a SB6183.
It's just not ok to leave it like that (too high, needs some fixing)

Bear in mind this is also a peak time of the year for higher return and low forward signal levels, because of temperatures outside (that said, also a good time for getting repairs done, if needed)


I go with if it's working, leave it be, I am surprised it even plays.

Highlighted
Expert

Re: Upload not Reaching Expectations (200/20)

take splitters out of the line, get upstream below + 50 dBmv and see if that corrects upstream rate.