Perle Systems DS1 - Manual (Page 37)

Setting Up Lines
Configuring the Device Server 37
Connecting Through the Device Server
When a user connects through the Device Server, that user is authenticated and is usually set up with
a
User Service that, once authentication is completed successfully, passes the user onto the specified
host. Therefore, the Line Service is set to DSLogin and the User Service is set to whatever protocol
the user will use to access the host; in this example, the User Service is set to Dir Telnet . When User
Service Dir Telnet is selected, the IP address of the HR_Server is specified as the target Host IP.
User Dennis will always have to log into the same server with this configuration.
Network
Device Server
HR_Server
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rl
e
Dennis
Dumb Terminal
Setting Up Lines
Line and port is often used interchangeably. They are almost the same, that is, each line has an
associated port number (Line 1 is port 10001 by default), so port buffering settings are the same as
the buffering settings for the line.
How you set up a line is really determined by the device that is connected to the line. This section
goes over some of the common ways a line is used and things that you will want to keep in mind
when configuring the line.
Direct/Silent/Reverse Connections
Direct connections bypass the Device Server, enabling the user to log straight into a specific host. A
direct connection is recommended where a user logging in to the Device Server is not required. It is
also recommended where multiple sessions are not a requirement. Direct connections require user
interaction: the message
Press return to continue is displayed on the user’s screen and the
session to the host is not initiated until Enter is pressed, after which the host login prompt is
displayed. The message is redisplayed on logout.
Silent connections are the same as direct connections except that they are permanently established.
The host login prompt is displayed on the screen. Logging out redisplays this prompt. Silent
connections, unlike direct connections, however, make permanent use of pseudo tty resources and
therefore consume host resources even when not in use.
Reverse connections enable a host on the local network to establish a connection through the Device
Server port to a serial device.