v Port Ring

1.3.6.1.4.1.22.65.1.2.6.1.2.14.1.57

Indicates whether the port ring characteristic is enabled. When enabled, a physical serial port will raise and lower its RTS output and wait for the DSR input to be raised before accepting a remote connection request. 'not-applicable(3)' indicates that the port is not a physical serial port. The agent will accept any valid value on a set-request for such ports.