ISDN-Oriented Modular VLSI Chip Set for Central-Office and PABX Applications |
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Authors: | Geiger G Lerach L |
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Affiliation: | Components Group, Siemens AG, Munich, West Germany; |
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Abstract: | This paper describes a new ISDN-oriented modular (IOM®) architecture developed to establish the subscriber basic access to an Integrated Services Digital Network in a central-office or PABX environment with a minimum number of VLSI circuits. A four-component VLSI chip set is presented, consisting of the S-bus interface circuit (SBC), the ISDN burst transceiver circuit (IBC), and the ISDN echo cancellation circuit (IEC) for layer 1 data transmission at the fourwireSand the two-wireUinterface, respectively, and the ISDN communication controller for layer 2 link access protocol control. The development strategy, the functions of the IC's, and examples for their application in the subscriber terminal and digital subscriber line board are emphasized. |
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