High-speed data communications modem

Patent 5787483 Issued on July 28, 1998. Estimated Expiration Date:

September 22, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

High speed digital modem
Patent #: 4514825
Issued on: 04/30/1985
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Issued on: 08/06/1996
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Inventors

Application

No. 532923 filed on 09/22/1995

US Classes:

711/158, Prioritizing711/109, Shift register memory711/151, Prioritized access regulation711/169, Memory access pipelining711/211Address multiplexing or address bus manipulation

Examiners

Primary: Swann, Tod R.
Assistant: Tzeng, Fred F.

International Class

G06F 012/00

Abstract

A computer network for high-speed data communication, has a data transmission cable with a root and at least one leaf node. A signal conversion system (SCS) is attached to the root, and at least one client station is attached to a leaf node. The SCS consists of a transmitter that transmits down-stream data onto said cable in a first frequency band; and a receiver that receives data from said client stations on a second frequency band; wherein said down-stream data includes synchronization and acknowledgement signals. Each client station has a receiver that receives data on said first frequency band, and a transmitter that transmits data on a second frequency band according to synchronization signals received on said first frequency band.The computer network is controlled by a method comprising transmitting down-stream from the signal conversion system (SCS) a control signal having synchronization information on a first frequency band, receiving said control signal at client stations, transmitting up-stream from said client stations to said SCS on a second frequency band, the transmission being timed with respect to said synchronization information, and acknowledging on said first frequency band successful receipt by said SCS of said up-stream transmission.The client station's transmission packets may include requests for reserved slots on said second frequency band for subsequent transmissions, and the SCS has a scheduler operable to determine a start time for requested reserved slots, and transmits the start time for the requested reserved slots. The client stations are operable to wait to continue transmission until after waiting for the start time.Other systems and methods are disclosed.