Single chip implements FDDI physical layer: CMOS part consumes less than 800mW. (AT&T's new T7351 implements the Fiber Distributed Data Interface physical layer) (product announcement)

EDN, June, 1990 by Figueroa, Juan

Single chip implements FDDI physical layer AT&T'S T7351, the first single-chip solution for the Fiber Distributed Data Interface (FDDI) physical (PHY) layer, saves designes as much as 60% board space compared with other available chip sets. The part is fully compliant with the ANSI X3T9.5 PHY specification.

The PHY device manages the connections among the FDDI Physical Medium Dependent (PMD), the Media Access Control (MAC), and the Station Management (SMT) layers. It monitors and controls the media line state, exchanging this information with the MAC and SMT layers.

Use of 0.9-[micrometer]m CMOS technology allows a 1-chip PHY implementation that includes clock recovery and consumes less than 800 mW. The latter feature is particularly valuable to...

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