Unique Switching Challenges to Address International Digital Systems Interfaces
01 January 1987
With the emergence of fiber optic underseas cables, interconnection of digital facilities between international entities generates numerous interfacing challenges for communications systems that do not match. International digital communications networks must interwork to accommodate the unique characteristics of each network and its equipment. Unique problems arise for handling CCITT-recognized signaling standards, such as CCITT5, CCITT6, and CCITT7 and digital system differences, such as A-law to MU-law conversion, 30 channel to 24 channel conversion, echo control and testing. Solutions being used by AT&T to address these issues in the gateway digital switching system are described.