0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
An arrangement that permits sequential connection of tie trunks between PBX and Centrex® locations by using tandem operation. Note: Tandem operation permits two or more dial tie trunks to be connected at a tandem center to form a through connection.