Automatic communication protocol detection system and method for network systems

摘要

A communication protocol detection system for enabling a network system to detect and interface one or more network devices each operating according to at least one of a plurality of different communication protocols. In one embodiment, a network interface card (NIC) is capable of operating according to one of two different communication protocols, such as the 10Base-T and 100Base-TX Ethernet Standards. The NIC includes two corresponding transceivers, where the transceivers are interfaced to a network connector for interfacing an external network device. Control logic initially enables the 10Base-T transceiver to determine if link pulses are detected. If link pulses are detected, the 100Base-T transceiver is enabled to determine if it detects the link pulses. If so, the 100Base-T transceiver is used to establish communications, and if not, the 10Base-T transceiver is used. Preferably, the 100Base-T transceiver is re-enabled a predetermined number of times to determine if the network device is a 100 Mbps device. In another embodiment, a repeater includes a plurality of interface circuits, each including a plurality of transceivers. Each of the transceivers of each of the interface circuits of each port is connected to a corresponding repeater module through an array of buses. Control logic enables the transceivers one at a time within each interface circuit and correspondingly monitors the corresponding link signal. When an enabled transceiver detects link pulses, that transceiver is used to establish communications. If a link signal indicates termination of communications, enabling of the transceivers one at a time is resumed.