There is an ftp command available in the shell, but no telnet command. However, when you use the OMVS command to login to the shell, you can switch to TSO and issue the telnet command from there, with the following restriction: When you telnet to a remote MVS™ host and then access a shell, you can work in line mode only (for example, you cannot use vi).

See z/OS Communications Server: IP User's Guide and Commands for detailed information about using the telnet command from TSO.