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A first wireless node provides a method of avoiding multiple access collision in a wireless network. The system receives a request to send data from a second wireless node (405) and determines if the system is receiving data from a third node (410). The system transmits a non-authorization message i

A first wireless node provides a method of avoiding multiple access collision in a wireless network. The system receives a request to send data from a second wireless node (405) and determines if the system is receiving data from a third node (410). The system transmits a non-authorization message if the system is receiving data from the third node (415). If, however, the system is not receiving data from the third node, the system transmits an authorization message to the first wireless node (420). The system receives data from the second node in response to the authorization message (425) and then transmits an acknowledgment message to the second node acknowledging receipt of the data (435).

대표청구항 ▼

A first wireless node provides a method of avoiding multiple access collision in a wireless network. The system receives a request to send data from a second wireless node (405) and determines if the system is receiving data from a third node (410). The system transmits a non-authorization message i

A first wireless node provides a method of avoiding multiple access collision in a wireless network. The system receives a request to send data from a second wireless node (405) and determines if the system is receiving data from a third node (410). The system transmits a non-authorization message if the system is receiving data from the third node (415). If, however, the system is not receiving data from the third node, the system transmits an authorization message to the first wireless node (420). The system receives data from the second node in response to the authorization message (425) and then transmits an acknowledgment message to the second node acknowledging receipt of the data (435). rt the modulated radio frequency signal into a transmit signal that travels over a two wire medium; an amplifier configured to convert a receive signal from the two wire medium into a filtered radio frequency receive signal; a phase demodulator configured to convert the filtered radio frequency receive signal into a baseband receive signal; and a receive-side differential converter configured to convert the baseband receive signal into the decoded receive signal provided to the encoder/decoder. 2. The network converter of claim 1, wherein the encoder/decoder is a Manchester encoder/decoder. 3. The network converter of claim 1, wherein the encoded transmit signal and the encoded receive signal comply with 10BASE-T Ethernet protocol. 4. The network converter of claim 3, wherein the transmit and receive signals are differential binary phase shift keyed (DBPSK) signals. 5. The network converter of claim 1, wherein the transmit and receive signals are differential quadrature phase shift keyed (DQPSK) signals. 6. The network converter of claim 1, wherein the two wire medium is a twisted wire pair. 7. A system for data communications, the system comprising: two or more computing devices each having an associated network interface card; a two wire medium; and two or more network converters each coupled between the two wire medium and a respective one of the network interface cards, wherein each network converter is configured to communicate over the two wire medium using a differential phase shift key modulated signal. 8. The system of claim 7, wherein each network converter includes: a transmit-side differential converter configured to convert a binary transmit signal into a differential transmit signal; a phase modulator configured to convert the differential transmit signal into a modulated radio frequency signal; and a bandpass filter configured to convert the modulated radio frequency signal into a transmit signal that travels over a two wire medium. 9. The system of claim 8, wherein the transmit-side differential converter produces the differential transmit signal by combining each bit of the binary transmit signal with a previous bit of the differential transmit signal. 10. The system of claim 8, wherein each network converter further includes: an amplifier configured to convert a receive signal from the two wire medium into a filtered radio frequency receive signal; a phase demodulator configured to convert the filtered radio frequency receive signal into a baseband receive signal; and a receive-side differential converter configured to convert the baseband receive signal into a decoded receive signal. 11. The system of claim 10, wherein each network converter further includes: an encoder/decoder configured to convert an encoded transmit signal received from a network interface card into said binary transmit signal, and further configured to convert said decoded receive signal into an encoded receive signal that is provided to the network interface card. 12. The system of claim 11, wherein the encoder/decoder is a Manchester encoder/decoder. 13. The system of claim 7, wherein each network converter is further configured to convert an Ethernet signal from the respective one of the network interface cards to a transmitted differential phase shift key modulated signal, and is further configured to convert a received differential phase shift key modulated signal to an Ethernet signal to the respective one of the network interface cards. 14. A method of establishing computer communication over a two wire medium, the method comprising: receiving an encoded transmit signal from a network interface card; decoding the encoded transmit signal to obtain a decoded transmit signal; converting the decoded transmit signal into a differential transmit signal; phase modulating a radio frequency signal in accordance with the differential transmit signal; and coupling the phase modulated radio frequency sign al to the two wire medium. 15. The method of claim 14, further comprising: receiving a phase modulated radio frequency signal from the two wire medium; demodulating the received phase modulated radio frequency signal to obtain a baseband signal; processing the baseband signal with a differential converter to obtain a decoded receive signal; encoding the decoded receive signal to obtain an encoded receive signal; and providing the encoded receive signal to a network interface card. 16. The method of claim 14, wherein the encoded transmit signal is a 10BASE-T Ethernet signal. 17. The method of claim 14, wherein the two wire medium is a twisted wire pair. 18. The method of claim 14, wherein the phase modulated signal is one of a differential binary phase shift keyed signal and a differential quadrature phase shift keyed signal. 19. The method of claim 14, wherein said converting includes: storing bits from the differential transmit signal in a delay element; and combining bits from the delay element with bits from the decoded transmit signal to produce bits in the differential transmit signal, wherein said combining employs a logical XOR operation. anta Clara, CA, copyright 1999, 1 page. "DynamicAccess.RTM. Managed PC Solutions--Lower the cost of PC ownership with Desktop Management Interface (DMI 2.0s)", product specification guide, 3Com Corp., Santa Clara, CA, copyright 1999, 2 pgs. "DynamicAccess.RTM. Managed PC Solutions--Now you can wake up PCs from a central management station", product specification guide, 3Com Corp., Santa Clara, CA, copyright 1999, 1 pg. "Desktop Management--Centralized Control Across Distributed Systems", technology/services guide, 3Com Corp., Santa Clara, CA, copyright 1999, 11 pgs. "3Com Managed PC Solutions--Lowering Total Cost of PC Ownership", technology/services gide, 3Com Corp., Santa Clara, CA, copyright 1999, 5 pgs. "Introducing the 3CR990-TX-97 10/100 PCI NIC with 3XP processor", product specification guide, 3Com Corp., Santa Clara, CA, copyright 1999, 4 pgs. "10/100 Mbps Fast Ethernet PCI Network Interface Card 100 Mbps Performance Benchmark Comparison", LANQuest, Fremont, CA, Jan. 1998, 4 pages. "3Com.RTM. Eliminates Network Problem `Finger Pointing`", news and events, 3Com Corporation, Santa Clara, CA, Jun. 1999, 3 pages. tion port on said switch in accordance with those of said set of pre-defined broadcast routing heuristics which are associated with said destination port.