18. TCP Port Options
The VIP offers three optional functions, which can be used when
communicating with the unit via Telnet; the Telnet Pass-Through Mode,
the Real Time Mode, and the Selective Read Mode. All of these options
are selected by entering the appropriate Telnet Port Number in the Telnet
command line, as described in the sections that follow.
• Telnet ports 23, 2001, and 3001 allow normal access to the VIP
command mode. However, Port 3001 will transfer data using
"Raw Socket" mode.
• Telnet Pass-Through Mode, Real Time Mode, and Selective Read
Mode use the same System and User Passwords as are normally
used to log on to the VIP.
• The Telnet Pass-Through Mode, Real Time Mode and Selective
Read Mode all support XON/XOFF ﬂow control.
• NLJ-VIP units do not include PBX Port B or the
18.1. Standard Telnet Protocol & Raw Socket Mode
The Telnet Pass-Through Mode, Real Time Mode, and Selective Read
Mode all offer the option to send data using either Standard Telnet Protocol
or Raw Socket Mode. The port number entered in the telnet connect
command determines which protocol is used.
When Standard Telnet Protocol is used, the VIP will receive and reply to
all IACs. When Raw Socket Mode is used, data is always sent "as is", and
command echo is always enabled.