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Specifications

ManualsBrandsCabletron Systems ManualsSwitchDLE33-MA
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Configuring Modem Signals
11-6
Specifying MODEM CONTROL and SIGNAL
CONTROL
Introduction
The MODEM CONTROL and SIGNAL CONTROL characteristics are identical,
except that MODEM CONTROL is only used with full MODEM CONTROL
access servers, and SIGNAL CONTROL is used on all other access servers.
These characteristics enable or disable the use of MODEM CONTROL signals on
a port. With MODEM CONTROL or SIGNAL CONTROL enabled, the access
server automatically logs out the port whenever a loss of the DSR signal (if used)
is detected or if the DCD signal (if used) is deasserted for more than 2 seconds.
Furthermore, a user must log in to the access server successfully within 120
seconds, or the access server automatically disconnects the call. You should
disable MODEM CONTROL or SIGNAL CONTROL when a port is connected to
a device that does not use modem signals, or if the device cable does not support
modem signals.
Logging Out the Port with DSRLOGOUT or LONGBREAK LOGOUT
With MODEM CONTROL or SIGNAL CONTROL disabled, you can enable the
access server to log out a port when the attached device is turned off by enabling
port characteristic DSRLOGOUT (see Specifying DSRLOGOUT in Chapter 9) or
LONGBREAK LOGOUT (see Specifying LONGBREAK LOGOUT in Chapter 9).
Computer Interface
For computer interface connections, you need to enable MODEM CONTROL or
SIGNAL CONTROL and configure the host to use the modem signals. This
ensures that session status is passed between the access server and the host
system, which is important to maintain security.
When a user connected to the access server logs out from a system, the computer
terminates the session and deasserts the DTR signal. The access server interprets
this condition as a loss of DSR and terminates the session.
However, when the access server terminates a session, the access server deasserts
the DTR signal. The system interprets this condition as a loss of DSR and logs out
the user. This occurs when you enter a DISCONNECT command from the access
server user interface or turn the power off.