Intertoll Trunk Concentrating Equipment

This article deals with a method of handling traffic from outward toll switchboards in a metropolitan toll center to a specific distant toll center with the objectives of (1) providing the equivalent of direct access to intertoll circuits from the individual switchboards, for traffic for which direct circuits cannot be justified, (2) giving relief to the No. 4 type toll switching system in the metropolitan toll center, and (3) providing a means for the dispersion of toll switching facilities. A metropolitan toll center may contain a number of outward toll switchboards. Some of these are situated in the central toll building and others in decentralized locations. An individual outward switchboard may have a sufficient amount of traffic to a specific distant toll center to justify a group of intertoll circuits direct from the switchboard to the No. 4 type toll or crossbar tandem office in the distant center. It has been the practice to provide such direct access to intertoll circuits at centralized toll switchboards. Traffic exceeding the capacity of such intertoll trunk groups is handled over tandem trunks from the toll switchboards via the No. 4 type toll crossbar office in the originating center. The decentralized switchboards in general have reached intertoll cir303