This object specifies a URL (see RFC-1630) that specifies the
location of the field diagnostic image. The following list
provides some examples of URLs for the field diagnostic:
file://disk0:/images/fd001
Describes a file with the path '/images/fd001' on 'disk0:'
accessed locally.
ftp://pop-server/usr/bin/fd001
Describes a file with the path '/usr/bin/fd001' on the host
'pop-server' accessed via FTP.
tftp://pop-server/tftpout/fd001
Describes a file with the path '/tftpout/fd001' on the host
'pop-server' accessed via TFTP.