Control Connection; Data Connection; Ftp Login - HP 635n - JetDirect IPv6/IPsec Print Server Administrator's Manual

TFTP, Telnet, printer's control panel (see TCP/IP Configuration), the embedded Web server (see HP
Jetdirect Embedded Web Server (V.31.xx)), or management software.

Control Connection

Using standard FTP, a control connection is opened by the client to the FTP server on the HP
Jetdirect print server. FTP control connections are used to exchange commands between the client
and the FTP server. The HP Jetdirect print server supports up to four control connections (or FTP
sessions) simultaneously. If the number of allowed connections is exceeded, a message indicating
that service is not available will be displayed.
FTP control connections use TCP port 21.

Data Connection

A second connection, a data connection, is created each time a file is transferred between the client
and the FTP server. The client controls the creation of a data connection by issuing the commands
that require a data connection (such as FTP ls, dir or put commands).
Although the ls and dir commands are always accepted, the HP Jetdirect FTP server supports a
single data connection for printing at a time.
The transmission mode for an FTP data connection with the HP Jetdirect print server is always in
stream mode, which marks the end-of-file by closing the data connection.
Once a data connection is established, the file transfer type (ASCII or binary) can be specified.
Clients may attempt to autonegotiate a transfer type, and the default transfer type depends on the
client system (for example, Windows NT may default to ASCII, while UNIX may default to binary). To
specify the transfer type, enter the bin or ascii command at the FTP prompt.

FTP Login

To start an FTP session, enter the following command from a MS-DOS or UNIX command prompt:
ftp <IP address>
where <IP address> is the valid IP address or node name configured for the HP Jetdirect print
server. See the figure below.
158 Appendix B FTP Printing ENWW