Engineering Aspects of Office Balance

Office balance, as applied to the toll telephone network, can be divided into two major divisions, those of through and terminal balance. Through balance concerns the connection of one 4-wire intertoll trunk with another, switched on a 2-wire basis. Terminal balance is required for the interconnection of an intertoll trunk with a toll connecting trunk to the subscriber's central office. Because of the extent of private networks presently being engineered, it is necessary to balance the interconnection of calls within these networks. This paper is concerned with the basic principles of through and terminal balance, but primarily centers on terminal balance in the private and DDD networks, because that is the area of the majority of engineering problems.