N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 2 - Data Communications Basics and Legacy Technologies                                                Slide 31 of 45 _________________                                                                                  __________

                                ISDN - Primary Access

                                    23B + D

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Primary Access - The Primary Access service provides 23B channels and one D channel. B channel carries 64 K bps signal and D channel carries 64 K bps signaling information.

Applications - PABX-to-PABX connections, Video conferencing and Compressed videos