Avocent 210128 User Manual

The ESP serial hub has a built-in configuration utility that you may use to manage ESP hubs.

For information about when changes take effect, see When Changes Take Effect on page 12.

The configuration utility may be accessed three ways: with Telnet, by serial connection to port 1 
when the ESP serial hub has no configured IP address or by serial connection to the port(s) that 
have the configuration utility connection method enabled.

You may initiate a Telnet session to the IP address of the ESP serial hub and the standard Telnet 
port 23. For example, if a hub has an IP address of 192.168.0.5, entering 

 will 

connect to the configuration utility.

If the hub still has a default IP address (because it has not yet been configured or the hub has been 
reinitialized), you may use the predefined IP address of 192.1.1.1 to access the hub.

NOTE: The predefined IP address (192.1.1.1) is fixed, and unexpected errors may occur if another device has 
the same IP address or if there is more than one uninitialized ESP serial hub on the network. After the 
configuration utility is accessed, you must configure an IP address before the hub becomes operational. After the 
IP address is configured, the hub will no longer be accessible with the predefined IP address.

The ability to access the configuration utility with Telnet is a configurable option. By default, this 
option is enabled.

The configuration utility is automatically enabled on port 1 after delaying several seconds to allow 
an IP address to be configured using DHCP/BootP. The port will be configured at 19,200 baud, 8 
bits per character, no parity, 1 stop bit and no flow control. If the ESP serial hub already has an IP 
address or if the address is acquired through DHCP/BootP, this access method will not be active.