About the Author
About the Author P. K. Bhatnagar is director of the Centre for Development of Telematics (CDOT) in New Delhi, India. He has 25 years of experience in diverse areas of telecommunications including research and development, teaching, testing, validation, network planning, and network operations. He has also served as International Telecommunication Union (ITU) and Asia Pacific Telecommunity (APT) consultant on several occasions. In his current assignment, he is responsible for the development of rural and urban digital switching systems and implementation of new features and services such as intelligent network services, ISDN, V 5.1/V 5.2 interfaces, and ATM.