Type-N carrier telephone deviation regulator

THE type-N carrier system1 was introduced into the field 3 years ago to satisfy the increasing demand for short-haul toll telephone trunks. The system provides flat regulation for the group of 12 channels at each repeater and the receiving terminal. Individual channel regulation is provided only at the receiving terminal. The flat group regulation is adequate for longer systems, but for system lengths greater than about 150 miles, the transmission variation caused by temperature change could exceed the individual channel regulating ability of the receiving terminal. If this were to occur, the channels would not meet the severe standards specified for them as a component of a multilink toll connection.