This sets the ping time from your server to the server you are configuring. If the server doesn't respond to a ping, it will be disconnected. Values of 90 (default) to 300 are recommended.
/as server ChatNow set ping 300
As with client pings, the more frequent the pings, the more likely a server will be incorrectly disconnected when it is merely lagged. The less frequent the pings the more likely a server will stay connected as a "ghost" server. A medium ping frequency is designed to tell as accurately as possible when the connection still exists without overwhelming the servers with pings.