Subscriber Line Testing for Digital Switching Offices

This paper presents an overview of subscriber line testing as provided in Northern Telecom´s Digital World^®family of host and remote digital switching systems. Capabilities provided in Digital World satisfy the major telco needs related to subscriber line testing. The various products incorporate interfaces to external test systems as well as internal line test facilities. A new subscriber line measurement technique is identified. It offers further advantages in speed and accuracy and has many potential applications in the analog and digital switching environments.