User's Manual

Setup and Test
151
Using the FTP Client, and automating the transfers:
To perform the data transfers, an FTP Client running on a PC connected to an ST will
download and upload data files to the FTP Server running on a computer connected to the
same network as the Traffic Port of the AS4020. To avoid the influence of other network
traffic, all other computers on the network should be disconnected. If this is not possible,
disconnect from the network, and connect the FTP Server directly to the Traffic Port of the
AS4020 using a crossed Ethernet cable.
The Traffic Port should be set to 100Mbit/sec, half-duplex mode. The FTP Server PC’s
Ethernet port should be set to “Auto Speed, Auto Duplex”, or alternatively to 100Mbit/sec,
half-duplex.
It is recommended to use the command-line FTP Client which is included with all versions of
windows, as this will already be available on the PC (as it is installed at the same time as the
TCP stack) and gives a speed result at the end of the transfer.
The FTP Server PC and the FTP Client PC must have IP addresses in the same subnet. If
the PCs can “ping” one another, then they will be able to perform FTP transfers between
them. Note that when measuring uplink speeds (i.e. in the direction from the ST to the
AS4020), it is not necessary to run an FTP Server on the ST. Instead the FTP Client on the
PC connected to the ST will perform an FTP upload to the Server.
Note: It is possible that an FTP download could be cancelled or aborted part way through (a
number of reasons could cause this). If this is the case, the partly transferred file will reside
on the hard disk, and will have the correct name but will not have the expected file size.
Therefore the file sizes should be checked before any transfers are made. The files can
easily be rebuilt simply by running the “generate.bat” batch file described in the previous
section. Alternatively, when transferring files, make sure to choose a different destination
filename – i.e. when downloading a file called “1M”, save it as “1M_downloaded”. This is
described in more detail below.
The following instructions for performing the transfers assume that the IP addresses of the
Client and Server PC are in the same subnet and can ping one another through the AS4020
system.
Create a working directory containing test files:
1. Create a working directory: Make a new directory on a hard drive with at least 40MB
free disk space. You can do this with Windows Explorer by selecting the hard drive
letter and choosing “File -> New -> Folder”. Rename the folder as appropriate (e.g.
“FTPtests”).
2. Copy the “Filegen.exe” and “generate.bat” files into this directory and run the
“generate.bat” batch file (this is described in greater detail in the previous section).
This will create a set of files which can be used for upload measurements.
3. Performing a manual file transfer: Open a command prompt window. This can be
achieved by following the menu “Start -> Programs -> Accessories -> Command
Prompt”, or by opening the “run” box (Press the “Windows” keyboard key and the
letter “R” simultaneously) and typing in “cmd” and pressing Enter.
4. Navigate to your working directory, for example if the new folder created in step 1
was “C:\FTPtests”, enter the following commands (all commands shown below should
have either the “Return” or the “Enter” key pressed after typing them):
c:
cd \FTPtests
The command prompt will show the directory in which you are working.
5. Run the FTP Client and instruct it to connect to the IP address of the FTP Server. For
example of your FTP Server IP address is 10.0.60.1, enter:
ftp 10.0.60.1