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US 7,116,678 B2Granted
High speed physical layer for CSMA/CD systems
AssigneeHewlett-Packard Company
InventorDaniel Dove
Life of this patent
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Abstract
An electronic communications network technology, referred to as 100BASE-TD, offers full duplex operation and robust performance on marginal CAT5 wiring. It highly leverages 100BASE-TX functional blocks and is very complementary to 100BASE-TX, for example with regard to such 100BASE-TX features as auto-negotiation. In particular, the invention provides a carrierless IDLE that requires very low power during ambient operation.
Claims9
An electronic communications network device, comprising:
- a receive port terminating a receive path and said receive port providing connections to at least two pairs of receive cables;
- a transmit port terminating a transmit path and said transmit port providing connections to at least two pairs of transmit cables;
- a scrambler circuit coupled to said transmit port;
- a 4B to 5B coder coupled to said scrambler circuit;
- a regulated mark inversion (RMI) coder coupled to said 4B to 5B coder;
- wherein data transmissions over a communications network are split by data network transmitters amongst two pair of a set of four pair of cables, wherein said data transmission split reduces bandwidth load and signal attenuation per cable pair and enables an increase in minimum transmit amplitude, wherein a carrier is sent during actual transmit and not sent during idle, and further wherein a transmitted signal is passed in sequence through said scrambler circuit, said 4B to 5B coder, and said RMI coder.
3 more elements
A full-duplex data network communications system for Category-5 unshielded twisted pair cabling, comprising:
- at least one data-network transmitter providing for full-duplex operation;
- at least one data network receiver providing for full-duplex operation;
- a set of four pairs of wire in a Category-5 unshielded twisted pair (UTP) cable operable to interconnect the data-network transmitters and receivers, and which include a transmit pair and a receive pair of wires;
- a scrambler circuit coupled to one of said at least one transmitter;
- a 4B to 5B coder coupled to said scrambler circuit;
- a regulated mark inversion (RMI) coder coupled to said 4B to 5B coder;
- wherein a data transmission is passed in sequence through said scrambler circuit, said 4B to 5B coder, and said RMI coder;
- and wherein said data transmission is split by the data-network transmitters amongst two pair of the set of four pairs of wire, wherein said data transmission split reduces bandwidth load and signal attentuation per cable pair and enables an increase in minimum transmit amplitude, wherein a carrier is sent during actual transmit and not sent during transmit.
5 more elements
A full duplex data exchange method for an electronic communications network, comprising:
- scrambling a signal;
- processing said signal with a 4B to 5B coder, after said scrambling;
- processing said signal with a regulated mark inversion (RMI) coder, after said processing with said 4B to 5B coder;
- transmitting said signal over a transmit port having connection to two pairs of transmit cables;
- receiving said transmitted signal on a receive port having connections to two pairs of receive cables;
- processing said received signal with a regulated mark inversion (RMI) decoder, wherein said RMI coder is coupled to said 4B to 5B coder, wherein data transmissions over a communications network are split by data network transmitters amongst two pair of a set of four pair of cables, wherein said data transmission split reduces bandwidth load and signal attenuation per cable pair and enables an increase in minimum transmit amplitude, wherein a carrier is sent during actual transmit and not sent during idle, and further wherein a transmitted signal is passed in sequence through said scrambler circuit, said 4B to 5B coder, and said RMI coder;
- processing said signal with a 5B to 4B decoder, after said processing with said RMI decoder;
- and
- descrambling said signal after said processing with said 5B to 4B decoder.
6 more elements
Dependencies are inferred from the claim text.