1. Terry, J. B., Younge, D. R., and Matsunaga, R. T., “A Subscriber Line Interface for the DMS-100 Digital Switch,” National Telecommunications Conference Record, 1979, IEEE Press, 1979, pp. 28.3.1–28.3.6.
2. Ibid.
3. Telesis;Terry Caves,1983
4. Bellamy, John C., Digital Telephony, 2nd edition, John Wiley & Sons, New York, 1991, p. 251.
5. Ibid.