When writing ASCII files to tape in stream mode, FTP can use either the BSAM I/O routines or the LE runtime library function fwrite(). Using BSAM I/O routines allows the data set to be processed without embedded hexadecimal values being interpreted as print control characters and results in faster I/O.
This setting is available both when configuring an FTP client and an FTP server. It is applicable to the client when transferring files to the client's system, for example with a GET. It is applicable to the server when transferring files to the server's system, for example with a PUT.