Technical data

Configuring and Managing TELNET
14.1 Managing TELNET
Qualifier Description
/TIMEOUT Creates a TELNET device that has the following connection
attributes:
• NOIDLE—The connection is broken when the device is
finally deassigned. The device will automatically reconnect
when data is written to it.
• IDLE—Specifies the idle time for the device (in the format
hh:mm:ss). Note that the time has a granularity of 1
second. If the device is idle for at least the specified
amount of time, then the connection will be broken. ‘‘Idle’’
means that the device has neither received nor sent any
data for the idle period.
• NORECONNECTION—The device does not automatically
retry reconnections if they fail.
• RECONNECTION—When data is written to the device
and it is not connected, this value determines the interval
between reconnection attempts. For example, if an
application writes to a TN with a RECONNECTION value
of 0:1:00 and the first connection attempt fails, subsequent
connection attempts will be made in 1-minute intervals.
/NOTIMEOUT Creates a TELNET device that breaks the connection when
the device is finally deassigned (the last channel assignment is
deassigned).
14.1.5 Displaying Login Messages
To display login and logout messages at the operator’s console and log file, enter:
TCPIP> SET SERVICE TELNET /LOG=(LOGIN,LOGOUT)
14.1.6 TELNET Client (TN3270)
IBM 3270 Information Display System (IDS) terminal emulation (TN3270) lets
users make connections to hosts that use IBM 3270 model terminals.
TN3270 has default IBM 3270 IDS function assignments for DIGITAL keyboards.
In addition, users can make their own assignments and might ask you for help.
TCP/IP Services provides EBCDIC-to-DMCS and DMCS-to-EBCDIC translation
tables you can customize. Appendix B describes how to customize and rebuild
these translation tables.
For more information about using TN3270, enter the following DCL command:
$ HELP TN3270
14.2 Solving TELNET Problems
To improve TELNET performance, try modifying some of the internet parameters.
These changes might also decrease the use of system resources.
Configuring and Managing TELNET 14–3