N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 2 - Data Communications Basics and Legacy Technologies                                                Slide 30 of 45 _________________                                                                                  __________

                                    ISDN Basic Access

                                        2B + D

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Basic Access - Basic Access service provides two B channels and one D channel. B channels carry 64 K bps digital signal. The D channel carries 16 K bps  signaling information. B channel calls are established digitally by signaling the D channel.

Applications - One telephone and other computer connection or fax over the same ISDN line.