ISDN DATA INTERFACES

摘要

During the last CCITT Study Period, Study Group Ⅶ developed two Recommendations dealing with the ISDN interfaces for data communications services, namely Recs X30 and X31 (1).The present study period is expected to be a decisive one for the finalization of new CCITT Recommendations for the ISDN and particularly for supporting data communications services.This paper gives a brief review of the current activities in Study Group Ⅶ and of the results achieved up to now (2) (3).