Bay Networks 5390, Administering, Page: 149 / 888

893-741-B A6-7
Modems
In the following example, a port is configured for a 9600-baud bidirectional modem:
command:port 16
command:set port speed 9600 control_lines both
command:type_of_modem T2500 type dial_in mode adaptive
command:output_is_activity y inactivity_timer 20
command:input_flow_control eia output_flow_control eia
Setting Up Applications
The following subsections provide set-up procedures that allow applications to access the Model
5390 port to which a modem is attached. These procedures use the rtelnet utility (see rtelnet on
page C4-8 for more details). All ports to which rtelnet attaches must be in adaptive or auto_adapt
mode. Set the port parameter mode to either adaptive or auto_adapt.
tip and uucp
The following procedure sets up applications, such as tip and uucp, to access a modem:
1
Use the rtelnet utility to create a special file that references the Model 5390 port.
Using rtelnet allows setting up the application as if /dev/modem is directly connected. The
following example ties /dev/modem to port 13 on
5390_02 .
# rtelnet –mr 5390_02 13 /dev/modem
In the previous example, the –m argument instructs the Model 5390 server to momentarily drop
the network connection to the Model 5390 port when the pseudo device is closed; it also causes
the modem to hang up when the application exits. The –r argument directs rtelnet
to remove
the device name if it already exists; without –r, rtelnet exits with an error message if the device
name already exists.
2
Add rtelnet to /etc/rc (or the appropriate file) so that the special file is created when the
host boots.
3
Configure the application to use the special file created by rtelnet to access the
modem.