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CCIE Fundamentals: Network Design and Case Studies, Second Edition by Cisco Systems, Inc.

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Appendix B. IBM Serial Link Implementation

The following discussions clarify some common misconceptions and points of confusion associated with half-duplex, full-duplex, and multipoint connections.

Comparing Half Duplex and Full Duplex

Half-duplex and full-duplex serial links can often be confusing. One reason for the confusion is that there are several different contexts in which these two terms are used. These contexts include asynchronous line implementations, IBM Systems Network Architecture (SNA)-specific implementations, and data communications equipment (DCE) implementations. Each is addressed in the discussions that follow.

Asynchronous Line Definitions

Duplex, as seen on asynchronous communication lines (and in terminal emulation software ...

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