R2511-HP MSR Router Series Terminal Access Configuration Guide(V5)

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• A FEP can send the saved screen contents to a terminal when the screen is switched or redrawn on
the terminal.
• A router can send the saved screen contents to the terminal upon receiving control characters for
switching or redrawing the screen from a terminal.
The screen saving function of a terminal, FEP, or router varies. The screen saving function of a router
supports Telnet, ETelnet, and SSH. With this function enabled, a router sends the saved screen contents
to a terminal at startup, or when you select an item of the menu, switch between VTYs, or press the
terminal redrawing hotkey.
Only TTY supports screen saving.
Some types of terminals provide the screen saving function, enabling the terminals to switch to the
corresponding screen upon receiving the specified screen code, such as \E!10Q. When you perform
VTY service fast switching, the router sends a screen code to the terminal, which switches to the
corresponding operation interface after saving the current operation interface. To save the screens of
multiple VTYs, you must set different screen codes for these VTYs and make sure the number of screen
codes supported by the terminal is greater than the number of configured VTYs. Note that this function
needs terminal support. In addition, the screen codes that can be identified vary with terminal types and
the number of supported screen codes may also be different.
Terminal screen display size
The terminal screen display size determines the maximum lines and columns of characters that the screen
can display. By default, a terminal screen can display up to 24 lines (screen height) and up to 80
characters in each line (columns or screen width). You can set the terminal screen display size to meet
different service requirements.
Read blocking
Terminal data read blocking means that, if the router has not sent data received from the terminal
successfully, the router stops receiving data from the terminal until all the data is successfully sent.
Generally, enable this function only when the transmission rate between the router and the FEP is less
than that between the router and the terminal.
Terminal reset
In case the terminal fails to communicate with the receiver, you can press the terminal reset hotkey on the
terminal to cause the initiating router to disconnect and then re-establish the TCP connection with the
receiver.
Connectivity test
You can configure the terminal test hotkey on the router. By pressing the test hotkey on the terminal, you
can test the connectivity between the terminal and the router and the TCP connectivity between the
terminal and the FEP.
Data send delay
When data send delay is configured on the router, upon receiving data from the terminal, the router does
not send the data to the FEP until the specified period elapses. This allows the information collected within
the specified period to be sent together, which increases bandwidth utilization.
TCP buffer parameter configuration
Terminal access allows you to perform two types of buffer parameter configuration operations: TCP
buffer and terminal buffer. TCP buffer is used to store the data exchanged between the sender and
receiver. Terminal buffer is used to store the data exchanged between the sender and the terminal.