Up to 3 “telnet” interfaces can be configured on XRouter. The general purpose one defaults to TCP port 23. There's a sysop-only one, usually on TCP port 513, and one for machine-to-machine interactions, the so-called “Telnet Proxy”.

Here's a typical login to port 23 from a Linux terminal:

If you so desire, the “normal” telnet interface can be opened to the wider world, because connections to that port do NOT have “sysop” privileges, as can be seen by the reduced command set in the following example:

You can gain sysop privileges using the “@” command in one of two ways. The following example shows how you might do it via an insecure link such as IP over radio. Entering “@” by itself produces a “password grid”. The caller picks one line from the grid and sends the corresponding characters from their password:

(Note the larger command set available to sysops)

The other way to gain sysop privileges, on a more secure uplink, would be to issue the @ command followed by the plain text password, for example: