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Forum Discussion
~2MB/sec performance OK for WG103?
Hello- I have 3 prosafe WG103 switches, and the FTP file transfer rate I get when copying a file between two connected nodes in the network, is 2MB Is this acceptable or should I be seeing bette...
As you have discovered WiFi is not the greatest medium for bulk data transfers, and a lot will depend on the environment...
First - you're using 802.11g so you are limited to a theoretical maximum of 54 mbps, which translates to somewhere in the region of 20~30 mbps throughput - or 2~3 MB/sec - and yes, I do know it's 8 bits to a byte, your data transfer will also include addressing, check sums, etc, so there is some "overhead" that needs to be accounted for.
Next - Wifi is half duplex - the radios can not transmit & receive at the same time, and there is a certain degree of "switching latency", which causes a further degradation of potential throughput.
Last - transferring data between two WiFi nodes associated with the same access point (whch may or may not be the case in your particular scenario) requires special consideration - the sequence of events goes like this ...
- Node A transmits to the access point
- Access point switches RX/TX modes.
- Access points transmits to Node B.
- Access point switches RX/TX modes.
The above sequence ignores (for simplicity) the acknowldegements and so on required by the protocols, which would actually further reduce throughput, but from it, you can see that the 2~3MB/sec projected throughput is actually reduced to under 50% - and this is not even a worst case scenario - it's a "single access point scenario"
Best case scenario - your WiFi nodes are associated with different access points in which case the 50% degradation MAY be eliminated, depending on what's actually happening with the other network traffic.
Worst case scenario - you have interference between your multiple access points and CA (collision avoidance) kicks in, further degrading throughput.
I'd say your 1.86 MB/sec is not bad, it could be better, but it could also be worse.
First - you're using 802.11g so you are limited to a theoretical maximum of 54 mbps, which translates to somewhere in the region of 20~30 mbps throughput - or 2~3 MB/sec - and yes, I do know it's 8 bits to a byte, your data transfer will also include addressing, check sums, etc, so there is some "overhead" that needs to be accounted for.
Next - Wifi is half duplex - the radios can not transmit & receive at the same time, and there is a certain degree of "switching latency", which causes a further degradation of potential throughput.
Last - transferring data between two WiFi nodes associated with the same access point (whch may or may not be the case in your particular scenario) requires special consideration - the sequence of events goes like this ...
- Node A transmits to the access point
- Access point switches RX/TX modes.
- Access points transmits to Node B.
- Access point switches RX/TX modes.
The above sequence ignores (for simplicity) the acknowldegements and so on required by the protocols, which would actually further reduce throughput, but from it, you can see that the 2~3MB/sec projected throughput is actually reduced to under 50% - and this is not even a worst case scenario - it's a "single access point scenario"
Best case scenario - your WiFi nodes are associated with different access points in which case the 50% degradation MAY be eliminated, depending on what's actually happening with the other network traffic.
Worst case scenario - you have interference between your multiple access points and CA (collision avoidance) kicks in, further degrading throughput.
I'd say your 1.86 MB/sec is not bad, it could be better, but it could also be worse.