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Advanced Micro Devices Inc is looking for big business from the emerging Integrated Services Digital Network interface circuits market, and this week previewed what it believes will become a key part for interfacing clusters of terminal equipment to digital PABXs. Designed to implement the standards contained in AT&T’s Digital Multiplex Interface definition for simultaneous connection of multiple terminals via a twisted pair cable through a PABX to a host, the Am79C401 also supports HDLC, SDLC, X25 LAPB and LAPD protocols. With AMD’s other ISDN parts, it implements both ends of the S interface that links terminals to digital PABXs. To be fabricated in 1.2 micron nominal geometry CMOS, the Am79C401 will be jointly tested and certified with AT&T and samples are due at year-end.

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