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Study on subscriber line circuits applicable for analogue telephone and ISDN interfaces

By: Hashitsume, Y.; Fujii, S.; Tahara, T.; Ozeki, T.-A.;

1989 / IEEE

Description

This item was taken from the IEEE Periodical ' Study on subscriber line circuits applicable for analogue telephone and ISDN interfaces ' The mixed installation of analog interfaces and ISDN (integrated services digital network) interfaces in an ISDN switching system is important for a smooth transition to full-scale ISDN. The subscriber line interface circuit which can accommodate analog and ISDN interfaces is discussed. The following issues are considered: (1) accommodation of analog and ISDN interfaces in the ULIC (unified subscriber line interface circuit); (2) composition of the ULIC; (3) construction and functionality of the analog/ISDN signal conversion adapter; and (4) the impact of the ULIC on the switching system.<>