o  connection lost
    Generated when a successfully established PVC connection fails
    for some other reason than being disabled.
    Argument:
    reason      Error returned by the X.25 Access module when
                notifying the X.25 Relay module of the disconnection.
 o  retry limit exceeded
    Generated when an attempt to set up a PVC connection fails.
    Arguments:
    local pvc   State of the local end of the PVC connection.
    status
    relayed     State of the relayed end of the PVC connection.
    pvc status