This new edition of the Martin book, designed for computer professionals who have insufficient knowledge of telecommunications technology, covers major communications network architectures, analog and digital transmission, and optical fiber transmission systems. Annotation copyrighted by Book News, Inc., Portland, ORA PBX can be manual, with all the connections being made by operators. This is referred to as a PMBX (private manual branch exchanges). Many PBXs are completely automatic. An automatic PBX is called a PABX (private automatic branchanbsp;...
|Title||:||Telecommunications and the Computer|
|Publisher||:||Prentice Hall Professional - 1976|