Open telnet service

I once needed to telnet to the client's blade Fibre Channel switch module for configuration, but when I open the Windows 7's own CMD input telnet command, the system prompts me "not internal or External commands are not runnable programs or batches.

My first feeling is that the CMD function has failed, so I tried the ping command again. The strange thing is that the ping function can be used normally. At this time, I thought that this function may not be enabled on telnet on windows7.

Then open the "Control Panel", find the program and function, and then click the "Open or close windows function" in the upper left, will pop up the windows function dialog box, there are many windows inside this dialog box Small function, then find the Telent Client, check the box, confirm!