Latency theory

[guest2013-1]

I'm not sure if I posted this theory here before... bear with me

Could it be the software that limits you to a certain speed (like 512k or 128k or 256k) is the root of the problem re: Ping times between tower/modem?

I know the modem's aren't locked to a certain speed, it's 3mbits/s, but I think the software that limits our speed on the tower's side could be the bottleneck

Any thoughts?

 

[gripen]

Makes some sense. Instead of accepting *all* packets, the software will effectively stall or drop packets causing a real bottleneck as it throttles xMbits/sec to 128Kbits/sec. Its a possible cause for the bad ping times and this is probably what ProAsm is working on [8D]

He would have to confirm the details though. Or keep very quiet []

 

[ProAsm]

The Modem or NodeB's on the Towers do not have the intelligence to do this.
Emagine having to add every user and their logon options to each node on every tower in the whole country.
Everything is done at the Sentech Server in and out.


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[aftermath]

The bad ping times are due to one FACTOR - Air Time (The time the actual IP Packet spends in the air between your modem and the tower), and if you know how 3G works....The tower actually fetches your data, you don't actually transmit it from your modem to the tower.... I'm taking a flyer on this one, but it makes the most sense to me....

 

[flashvc]

I don't think it's "air time" but rather the way the system is designed (modulation etc). Look at GPRS..pings are 800ms+

--

 

[bb_matt]

Ok, so if it's airtime that's the problem, maybe gauteng has better ping times than the coast because the air is thinner up here... []

 

[aftermath]

Not a bad guess. Thanks Rodent for explaining the concept in such detail...

http://www.myadsl.co.za/forum/topic.asp?TOPIC_ID=2452

 

[gripen]

Nope. Its not the airtime. Recalling the time I was 50m from the tower, it makes little or no difference. Its the software. The signal goes from modem-tower in a few ms max.

 

[TheRoDent]

greedy, it's not the air "TIME". The time the signal travels in the air is of absolutely NO consequence, over the distances we're talking about.

It's the complicated way in which the signalling works, and the processing overhead required to encode/decode the signal. It's not the drivers, or anything else either. It's merely the way the UMTS TDD protocol is designed.

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[gripen]

What I was trying to say is that the physical waves travel in a very short time and the UMTS protocol (as you have explained) causes the slowdown. So thus, the slowdown does not take place anywhere in free space. It will all be in the transmission equipment on either end.

Perhaps I was a little naive.. those waves will travel way faster than a few ms [:I]

 

[guest2013-1]

According to TheRoDent, it is something to do with the software, encrypt/decrypt.

*sigh* Maybe when I get my own place (not the one I bought the other day) I'll install ADSL and setup some linux thingy to route like he does. That way I can kick ass []

 

[Ditch]

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by greedyflyza</i>
<br />Perhaps I was a little naive.. those waves will travel way faster than a few ms [:I]
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
At approx 3x10^8 m/s over 5.7 km range, should be about 0.019 ms latency between the modem and tower, by that reasoning Time in air definitely not the problem ..