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Abstract

A local area network modem which meets the stringent signalling requirements of the IEEE 802.4 standard. The modem supports loopback commands by insuring that the receiver and transmitter portions are in phase-synchronism, regardless of the physical distance between the modem and upper layer control circuitry. The transmitter also uses only two digital signal wires to specify which of a number of functions are to be performed by the transmitter analog components. An automatic gain control (AGC) circuit is included which eliminates a number of problems associated with prior designs. In particular, the modem's receiver monitors itself to automatically correct drift in phase and gain control adjustment, without intervention from the upper layer.

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First Claim