Think broadband monitor - Page 2

qasdfdsaq · 11-01-2012, 13:30

Quote:

Originally Posted by kwikbreaks

Doing it your way and running throttled back downloads for long periods makes your charts meaningless to everybody including you as have no idea what it may look like if you weren't downloading at all and it's only when your connection is idle that the chart throws any light on just the connection.

I don't use any QoS or throttling on my downloads. They just don't affect my chart for some reason, allowing my chart to be meaningful since it looks pretty much the same as it would have if my connection was idle.

To be absolutely precise scientifically speaking your connection would be affected simply by the fact that you're pinging it, so you'd never know what it would *actually* look like in truth as the creation of the chart itself modifies the outcome of the chart. The effect might be microscopic, but then again so is the effect of my downloads, even at full speed.

---------- Post added at 13:30 ---------- Previous post was at 13:26 ----------

Quote:

Originally Posted by Chrysalis

yes the vmng300 wont ever cycle the upstream channels.

Ah, now I understand your other post.

Sephiroth · 11-01-2012, 13:33

Quote:

Originally Posted by Chrysalis

yes the vmng300 wont ever cycle the upstream channels.
......

I don't think any CM cycles the upstream channel. The channel is offered in a UCD by the CMTS.

kwikbreaks · 11-01-2012, 14:03

Quote:

Originally Posted by qasdfdsaq

..downloads ... just don't affect my chart for some reason, allowing my chart to be meaningful since it looks pretty much the same as it would have if my connection was idle.

Strange. Even single thread downloads show up obviously on mine. Balls out multi-thread is usually the rule with the big ones and they just obliterate any blank space in the chart for their duration.

Quote:

Originally Posted by qasdfdsaq

To be absolutely precise scientifically speaking your connection would be affected simply by the fact that you're pinging it, so you'd never know what it would *actually* look like in truth

Well my area is pretty borked but I doubt that pinging my modem is going to have a significant impact even here. Looking at the chart might

....

Chrysalis · 11-01-2012, 14:39

actually scrap what I said, I noticed that reboot was around 5pm when shaping is activated, so was probably coincidence. Sad that even with the shaping the graph was a mess tho.

---------- Post added at 14:39 ---------- Previous post was at 14:35 ----------

Quote:

Originally Posted by Sephiroth

I don't think any CM cycles the upstream channel. The channel is offered in a UCD by the CMTS.

Whatever cycles it, it doesnt happen on the vmng300, craig confirmed this as well.

Sephiroth · 11-01-2012, 19:33

[QUOTE=Chrysalis;35359366]actually scrap what I said, I noticed that reboot was around 5pm when shaping is activated, so was probably coincidence. Sad that even with the shaping the graph was a mess tho.

---------- Post added at 14:39 ---------- Previous post was at 14:35 ----------

Whatever cycles it, it doesnt happen on the vmng300, craig confirmed this as well.[/QUOTE]

... and I reported in the other thread that my VMNG did swap upstream channels. Several times - as it would if the CMTS is sending UCDs according to whichever upstream channel is least busy at the moment (or something like that).

craigj2k12 · 12-01-2012, 04:03

both the VMNG and the superhub 'remeber' the channels and order of channels they were connected to previously, and will not change unless told to by the CMTS, although with the superhub, a factory reset erases the firmware and loses this memory, so by factory resetting you are able to swap channels, by keeping re-setting until it changes

Sephiroth · 12-01-2012, 10:23

The modems are dumb in this respect. The allocation of upstream channels at reboot time depends on load balancing considerations as reported by the CMTS during registration.

kwikbreaks · 12-01-2012, 10:25

Does the VMNG300 have a reset button? If so did you try it?

I'm pretty much 100% certain that I've seen different channels on my VMNG300 but I'm not 100% sure that it wasn't just after some network change or other (I've had a couple of IP changes since I had it). At the time I had no congestion issues so wasn't overly fussed. Now I do so being able to sample the grass on the other side of the fence would be nice.

Sephiroth · 12-01-2012, 10:48

The 300 has an on/off switch at the back.

kwikbreaks · 12-01-2012, 11:07

I'm pretty sure that at least some of the memory in it is non-volatile - e.g. the log survives a power cycle so if it "remembers" which upstream was used it's quite likely it will use that first to see if it can negotiate the same connection.

I can probably take a look to see if there's a pinhole but I've got it behind the settee (where the Superhub had to go to hide the light show)

Chrysalis · 12-01-2012, 12:09

Quote:

Originally Posted by kwikbreaks

Does the VMNG300 have a reset button? If so did you try it?

I'm pretty much 100% certain that I've seen different channels on my VMNG300 but I'm not 100% sure that it wasn't just after some network change or other (I've had a couple of IP changes since I had it). At the time I had no congestion issues so wasn't overly fussed. Now I do so being able to sample the grass on the other side of the fence would be nice.

it has no reset button, pinhole etc. there is no way to reset to factory defaults on it, at least no published way.

Also it seems seph had a diff version of the vmng300 to me, as I have no power on/off either. To turn mine off is just removing its power source.

Sephiroth · 12-01-2012, 12:18

The upstream is offered by the CMTS on criteria determined by the CMTS. From BradyVolpe:

Once a cable modem is powered on and connected to the RF cable of a CATV network, it will begin a “hunt” for a valid downstream DOCSIS channel. First the cable modem looks for and locks to any 64- or 256-QAM digital channel. Fortunately for the modem, the CMTS is sending out a “Sync” broadcast at least every 200 msec, which is used for system timing. In addition, the CMTS sends out an Upstream Channel Descriptor (UCD) every two seconds, which tells modems the upstream frequency to transmit on, symbol rate, modulation profile, and other parameters necessary to communicate on the network. Finally the CMTS is sending out Media Access Protocol (MAP) messages to allocate “talk time” to each cable modem. You see, since there are many cable modems and only one upstream frequency, the cable modems must “time-share” the upstream channel, which is called Time Division Multiple Access (TDMA). Now, when the cable modem successfully locks to a QAM channel, it looks for the Sync, UCD and MAP messages from the CMTS. If it finds these it knows it is on an active DOCSIS channel. If they are not present, the cable modem assumes the DOCSIS channel is offline or it is on a video QAM channel and continues its search.

qasdfdsaq · 12-01-2012, 13:28

Quote:

Originally Posted by Chrysalis

there is no way to reset to factory defaults on it

EMP?

craigj2k12 · 12-01-2012, 16:30

Quote:

Originally Posted by qasdfdsaq

EMP?

the only way, although when i got mine it has been wiped, it was a refurb unit from the CEO office, but took ages to set up as it had to download the most recent firmware, so there must be a way, probably have to take it apart though to find out

jb66 · 12-01-2012, 20:53

Quote:

Originally Posted by Sephiroth

The 300 has an on/off switch at the back.

Only the v3 version

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Quote:

Originally Posted by jb66

I sometimes see folk posting these when complaining about performance. When I'm Hammering torrents my graph looks poor but when it's idle it's fantastic. How can this be used as a reliable indication of how good someones Internet is if we can't prove someone on there network is torrenting?

---------- Post added at 11:25 ---------- Previous post was at 11:23 ----------

This is my superhub that I'm testing to see if it's any good on 5ghz

This is my vmng300 downloading 30gig of torrents

Obviously my area had an issue, both crap last night