Indicates how long a terminal connection can be idle with no SNA data traffic before the connection is dropped. The TN3270 server records the time at which data is received from VTAM or sent to VTAM per connection. The server periodically scans the connections and checks if the connection has had any data sent or received within the inactivity interval. If not, the connection is dropped.
Caution must be used in setting this timer. Setting it too low could cause excessive CPU usage.