ndt-users list created

[Rich Carlson <>]

Galuschka;

The NDT server notes the time every packet arrives or is sent during the 
2 tests (Server-to-Client (s2c) and Client-to-Server (c2s)).  This gives 
2 timings for data packets c2sdata & sc2data, and 2 timings for 
acknowledge packets c2sack & s2cack.  The server calculates the 
instantaneous speed for each packet pair by using the data sent/acked 
and the time difference of the 2 packets.

Since the NDT system was originally designed to work in a campus network 
environment, the server assumes that PC's are connected via standard 
network connections (10/100/1000 Ethernet, 802.11A/B wireless, OC-x WAN 
connections).  The results of the pkt-pair timings are quantized and 
stored in these standard connection bins.

At the present time, the bottleneck link detection algorithm identifies 
the c2sdata bin with the largest value and writes out the bin name.
In your case, this was the OC-12 WAN bin.  Yes, there are some 
deficiencies in this algorithm, code revisions are certainly welcome.

Rich

On 1/3/2011 1:30 AM, galuschka wrote:
> hello,
> i want to know ndt how to get the information "end-to-end path is a a a 622
> Mbps OC-12 subnet" ?
> i have found it in Tcpbw100.java. The information which like get from
> "c2sData " variable , but i can't find what's mean about the variable ?
>
> Please somebody help me out in understanding it correctly.