telnet session times out

[Avi]

I'm connecting from a WinXP machine into a Linux Fedora Core 6 machine
via telnet.
After a while of inactivity the telnet times out.
Connecting via telnet is a requirement. I cannot use other connection
tools
My questions:
1.	How could I tell if the connection is closed by the server (Fedora
Core 6) or by the client (WinXP)
2.	Where and how could I set the time out to infinite

Thanks,
Avner