Methods and arrangements for transmitting high speed data over reduced bandwidth communication resources

• US 6,320,900 B1
• Filed: 10/30/1998
• Issued: 11/20/2001
• Est. Priority Date: 10/30/1998
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Liu, Ce Richard
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Tran, Khai
• Application Number:
  US09/183,613
• Time in Patent Office: 1,117 Days
• Field of Search: 375/219, 375/259, 375/257, 375/377, 375/316, 375/295, 375/222, 375/211, 341/70, 341/68, 341/69
• US Class Current: 375/219
• CPC Class Codes: G11B 20/1419 to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
• CPC Class Codes: H03M 5/12 Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 27/2075 in which the data are represented by the change in carrier phase
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Abstract

Methods and arrangements are provided that allow for data communications between a plurality of devices over a reduced bandwidth communication medium, such as, for example, a twisted pair wire as used in many home environments for telephone access. The methods and arrangements advantageously reduce the necessary bandwidth required for a data communication by eliminating the need to transmit encoded data, such as Manchester encoded data between devices. Thus, for example, Ethernet configured data that is encoded and output by a network interface within a sending device/appliance is intercepted, decoded, transmitted over a reduced bandwidth communication medium, and then re-encoded and re-transmitted or otherwise supplied to the network interface within the receiving device/appliance. For Manchester encoded data signals associated, for example, with a 10 BASE-T Ethernet network, the encoded data signal has a data rate that is twice that of the decoded data signal. Therefore, using the methods and arrangements of the present invention, an intercepted 20 Mbps Manchester encoded data signal is decoded to a corresponding 10 Mbps data signal, modulated using an RF carrier, transmitted for limited distances over a twisted pair wire, demodulated to a baseband frequency, re-encoded to a 20 Mbps Manchester encoded data signal, and then provided to the receiving device.

Claims

1. A network arrangement comprising:

a data communication medium;

a first device configured to output encoded data;

a decoder configured to receive the encoded data and output corresponding decoded data therefrom;

a transmitter configured to receive the decoded data and transmit the decoded data over the data communication medium;

a receiver configured to receive the decoded data over the data communication medium and output the decoded data;

an encoder configured to receive the decoded data from the receiver and regenerate the encoded data therefrom;

a second device configured to receive the encoded data from the encoder;

wherein the encoded data has a first data rate and the decoded data has a second data rate that is less than the first data rate; and

wherein the data communication medium has a data rate that is less than the first data rate.

2. The network arrangement as recited in claim 1, wherein the encoded data includes return-to-zero (RTZ) data.

3. The network arrangement as recited in claim 2, wherein the RTZ data includes Manchester encoded data.

4. The network arrangement as recited in claim 2, wherein the decoded data includes non-return-to-zero (NRZ) data.

5. The network arrangement as recited in claim 4, wherein the decoder is further configured to convert the RTZ data into the NRZ data.

6. The network arrangement as recited in claim 4, wherein the encoder is further configured to convert the NRZ data into the RTZ data.

7. The network arrangement as recited in claim 4, wherein the transmitter is further configured to modulate the NRZ data and the receiver is further configured to demodulate the NRZ data.

8. The network arrangement as recited in claim 1, wherein the data communication medium includes at least one twisted pair wire.

9. A method for transferring information from a first device to a second device over a data communication medium, the method comprising:

receiving information from the first device as encoded data;

decoding the encoded data to produce decoded data;

transmitting the decoded data via the data communication medium;

receiving the decoded data via the data communication medium;

then

regenerating the decoded data;

encoding the decoded data to reproduce the encoded data;

providing the encoded data to the second device;

wherein the encoded data has a first data rate and the decoded data has a second data rate that is less than the first data rate.

10. The method as recited in claim 9, wherein the encoded data includes return-to-zero (RTZ) data and the step of decoding the encoded data further includes converting the RTZ data to non-return-to-zero (NRZ) data.

11. The method as recited in claim 10, wherein the step of encoding the decoded data further includes converting the NRZ data to the RTZ data.

12. The method as recited in claim 10, wherein the RTZ data includes Manchester encoded data.

13. The method as recited in claim 9, wherein the step of transmitting the decoded data further includes modulating the decoded data, and the step of receiving the decoded data further includes demodulating the transmitted data.

14. The method as recited in claim 9, wherein the step of transmitting the decoded data further includes transmitting the decoded data through at least one twisted pair wire within the data communication medium.

15. A converter for use in connecting a computing resource requiring a bandwidth for data communication with a data communication medium having a bandwidth smaller than the bandwidth required by the computer resource, the converter comprising:

an encoder/decoder configured to receive outgoing return-to-zero (RTZ) data requiring a first bandwidth from the computing resource and convert the outgoing RTZ data to outgoing non-return-to-zero (NRZ) data requiring a bandwidth less that the first bandwidth;

a transceiver configured to receive the outgoing NRZ data from the encoder/decoder and transmit the outgoing NRZ data over the data communication medium having a bandwidth less than the first bandwidth.

16. The converter as recited in claim 15, wherein:

said transceiver further configured to receive incoming NRZ data from the data communication medium; and

said encoder/decoder further configured to receive incoming NRZ data from the transceiver and convert the incoming NRZ data into incoming RTZ data to be passed to the computing resource.

17. The interface arrangement as recited in claim 15, wherein both the incoming and outgoing RTZ data include Manchester encoded data.