1. CCITT Blue Book, vol. III.7, Integrated Services Digital Network (ISDN) General Structure and Service Capabilities (Geneva: ITU, 1989).
2. CCITT Blue Book, vol. VI.10, Digital Subscriber Signalling System No. 1 (DSS 1), Data Link Layer (Geneva: ITU, 1989).
3. ANSI T1.606-1990, Integrated Services Digital Network (ISDN)—Architectural Framework and Service Description for Frame-Relaying Bearer Service, 1990.
4. W. R. Byrne and others, “Evolution of Metropolitan Area Networks to Broadband ISDN,” IEEE Communications Magazine, vol. 29, no. 1, January 1991, pp. 69–82.
5. D. L. Schilling and others, “Spread Spectrum for Commercial Communications,” IEEE Communications Magazine, vol. 29, no. 4, April, 1991, pp. 66–79.