sentences:  In the terminating half of the crossbar office, a "terminating sender link" circuit connected a terminating sender to the trunk, in order to receive the information from the Originating Sender.This was typically done using Revertive Pulse, as in the panel switch.Multi-frequency terminating senders were introduced in the 1950s as part of Direct Distance Dialing, and also used for incoming traffic from some local crossbar exchanges.