A viable multi-standard rate adapter chip for ISDN communications

A multistandard rate adapter coprocessor chip designed using 2 mu m CMOS technology for use in integrated services digital network (ISDN) terminal adapters and U-interface modems is presented. It provides a compact, low-power protocol converter to connect asynchronous (up to 19200-bit/s) and synchronous (up to 64-kbit/s) data terminal equipment with any digital 64-kbit/s network. The connection to the ISDN is established through an S-interface or a U-interface circuit. This rate adapter is the cornerstone of a 144-kbit/s U-interface modem and a major breakthrough for the next-generation multistandard terminal adapter.<
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