Local Orderwire and Express Orderwire Use the Local Orderwire and Express Order tabs to view AIC-I card local orderwire (section overhead signal) information. Item Description Buzzer On If checked, enables the orderwire buzzer. 4-Wire Level The receive (Rx) and transmit (Tx) four-wire orderwire level. 2-Wire Level The Rx and Tx two-wire orderwire level. Apply Applies changes made to the fields in the tab. Reset Cancels any changes to the tab and returns the fields to their last-saved settings. Help Displays context-sensitive help.