Austin Hughes CS - 116 - Manual (Page 19)

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CS-116
Console Server Mode
Configuring a serial port as a console server creates a TCP socket on the IP serial console unit that listens for a Telnet or SSH client
connection. When you connect to the TCP socket, you have access to the device attached to the serial port as if the device were
connected directly to the network. Data stream can be sent back and forth between the device and the Telnet/SSH client program.
Raw TCP is also supported with the Console Server Mode.
For console server mode, the user can configure the following parameters:
Listening TCP port number
The user can also access a serial port through the IP address of the IP serial console and the listening TCP port number of the serial
port. If the IP address of the IP serial console and the serial port are assigned as 192.168.123.100 and listening TCP port number
4001, the user can connect to the port as follows: telnet 192.168.123.100 4001
Protocol
Select Telnet, SSH or Raw TCP as the protocol. If the users are using a Telnet client program, select Telnet. If the users are using an
SSH client program, select SSH. When Raw TCP is selected, direct TCP socket communication is available between the IPCS
and the remote host.
Inactivity timeout
In order to avoid a client holding a TCP connection while no data transferring on the serial port for long time. If the inactivity timeout is
enabled, and no data activity between the IP serial console and the Telnet/ SSH client for the specified inactivity timeout interval
(no data activity in the serial port), the existing TCP session will automatically be closed. If the user wants to maintain the connection
indefinitely, configure the inactivity timeout period to 0.
TCP Keep-alive (no configuration required)
In order to avoid TCP connection lockup, the IP serial console will continue to check the connection status between the Telnet/ SSH
client and the IP serial console by sending “keep alive” packets periodically. If the Telnet/ SSH client does not answer the packets in a
period of time, system will assume that the connection is down unintentionally. The IP SERIAL CONSOLE will close the existing Telnet/
SSH connection, regardless of the inactivity setting. So the TCP connection won’t be deadlocked when user’s application closed
improperly or the network link interrupted.
Terminal Server Mode
In terminal server mode, the IP serial console will unit’s serial port is configured to wait for data from the device connected to the port.
If data arrive is detected, the IP SERIAL CONSOLE unit starts a TCP session as a Telnet or SSH client to a pre-defined server. The
server must be defined by you before the port can be configured for a Telnet or SSH client. This mode is used when you want to
access servers on the network from a serial terminal. Raw TCP is also supported with the Terminal Server Mode.
Dial-in Modem Mode
In this mode, the IP serial console unit assumes an external modem is attached to the serial port and is waiting for a dial-in
connection from a remote site. When a user dials-in using a terminal application, the IP serial console unit accepts the connection
and displays the appropriate prompt or menu for you that logged in.
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