1. “The Extended Framing Format Interface Specifications,“ Technical Advisory No. 70, Issue 2, American Telephone and Telegraph Company, Basking Ridge, NJ, Sept. 29, 1981.
2. Aaron, M. R., “PCM Transmission in the Exchange Plant,” Bell Syst. Tech. J., Vol. 41, Jan. 1962, pp. 99–141.
3. Telecommunications Transmission Engineering, Vol. 2, Facilities, Bell System Center for Technical Education, 1977.
4. Haury, P. T. and Romeiser, M. B., “T1 Goes Rural,” Bell Laboratories Record, Vol. 54, July/Aug., 1976, pp. 178–183.
5. See note 4.