Black Box Advanced Console Server, User Manual

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BLACK BOX® CS Installation, Administration, and User’s Guide 347
characteristics, usually those that differ from implementation-
dependent defaults. Otherwise, it modifies the terminal state
according to the specified operands.
TACACS Terminal Access Controller Access Control System.
Authentication protocol, developed by the DDN community,
that provides remote access authentication and related
services, such as event logging. User passwords are
administered in a central database rather than in individual
routers, providing an easily scalable network security
solution.
Terminal Access Controller Access Control System Plus . A
protocol that provides remote access authentication,
authorization, and related accounting and logging services
commonly used in UNIX networks.
TCP Keep-Alive Interval The time interval between the periodic polling of all inactive
TCP/IP connections, checking that the client processes really
are still there. After a certain period of inactivity on an
established connection, the server's TCP/IP software will
begin to send test packets to the client, which must be
acknowledged. After a preset number of 'probe' packets has
been ignored by the client, the server assumes the worst and
the connection is closed.
The keep-alive timer provides the capability to know if the
client's host has either crashed and is down or crashed and
rebooted.
Telnet A terminal emulation program for TCP/IP networks such as
the Internet. The Telnet program runs on your computer and
connects your PC to a server on the network. You can then
enter commands through the Telnet program and they will be
executed as if you were entering them directly on the server
console
Terminal Server A terminal server has one Ethernet LAN port and many
RS-232 serial ports. It is used to connect many terminals to
the network. Because they have the same physical interfaces,