Vodacom 3g is Pathetic.

vodacom3g

Vodacom Representative
Joined
Jan 14, 2005
Messages
12,065
Ah, you're talking about the packet headers and the impact this has on download speed. Also that small packets have a bigger total overhead than large packets although the effect only really becomes apparant with very small packets. This is however not what we were talking about unless Dave was comparing the download speed of files smaller than the normal packet size. For files larger than the packet size the ratio of the overhead over the data tend to become the same for all files and won't cause a different download speed for different file sizes. With the handshaking I was merely referring to the fact that it normally takes up to 10 seconds before my download starts. Do you want to convince me using network protocols that this is not the case when I know it for a fact?

No, I'm referring to the impact of store-and-forward devices on smaller packets vs packets at max MTU. But your point of payload ratio will also have an impact.
 

ic

MyBroadband
Super Moderator
Joined
Nov 8, 2004
Messages
14,805
Simple and common scenario that demonstrates the correlation between TCP/IP and packet loss and data transfer speed:

When transferring data [either up or down], for example using ftp|http [which is layered on top of TCP/IP], if a single frame within a specific packet is lost or delayed to the point where a timeout is triggered, what will happen is that TCP/IP will request the retransmission of the entire packet, which means more frames being transmitted and hopefully received and reassembled into their original packet, so far so good, but frames can and do arrive in any order [non-sequential] and all frames are required in order to assemble a packet from constituent frames, this means that TCP/IP has to wait until it has all the frames. If just one of the frames is missing then some time will have passed including the actual timeout before realising that a frame is not going to arrive. All of this adds latency to the actual data transfer itself, all of this will result in the overall data transfer taking longer than it should have under ideal conditions, and an increase in time results in a decrease in speed - regardless of the actual link speed...
 

L_mo

Active Member
Joined
Sep 25, 2006
Messages
31
I have heard a statement that MTN do not get disconnects

Is this true??? - Surely it would not be difficult to have an option to AUTO re connect
 

Tazz_Tux

Linux Guru
Joined
Jan 28, 2005
Messages
622
I have heard a statement that MTN do not get disconnects

Is this true??? - Surely it would not be difficult to have an option to AUTO re connect

I doubt that - it's a radio network so....as for the reconnect, that would be a software thing :)
 

Prometheus

Banned
Joined
Mar 19, 2006
Messages
4,252
You should trust them. They made you....:)

Or is that that why you don't trust them in the first place? ;)
They didn't make me. Just missed them luckily. :D
I have heard a statement that MTN do not get disconnects

Is this true??? - Surely it would not be difficult to have an option to AUTO re connect
I can't remember getting any disconnects on MTN's GPRS, don't know about their 3G.
 
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