Set the tty state in the interface.It can create a new row and delete a row.But when creat a new row,the application must be set.If you modify a row under the status of row, you change the status from valid to undercreation.when you have changed them,you change the status to valid.And if you will create a row,the values of tsAsyModeTtyIFIndex,tsAsyModeTtyAppID must be not null.