Ethernet transport facility over digital subscriber lines

• US 6,088,368 A
• Filed: 05/30/1997
• Issued: 07/11/2000
• Est. Priority Date: 05/30/1997
• Status: Expired due to Term

• Current Assignee: Lantiq Beteiligungs-GmbH & Company KG (Intel Corporation)
• Original Assignee: 3COM Limited (HP Inc.)
• Inventors: Rubinstain, Avinoam, Peleg, Shimon, Sfadya, Yackov, Porat, Boaz, Alroy, Noam
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): Tran, Maikhanh
• Application Number:
  US08/866,831
• Time in Patent Office: 1,138 Days
• Field of Search: 375/222, 370/203, 370/204, 370/206, 370/480, 370/482, 370/484, 370/486, 370/487, 370/490, 370/493-495, 370/445, 370/446, 395/200.63, 395/200.81
• US Class Current: 370/480
• CPC Class Codes: H04L 12/4612 LAN interconnection over narrowband networks, e.g. N-ISDN, PSTN, X.25
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

Abstract

The present invention provides a facility transport system for transporting Ethernet over digital subscnber lines. The system, termed 10BaseS, is capable of transmitting 10 Mbps Ethernet over existing copper infrastructure. The system utilizes carrierless amplitude modulation/phase modulation (CAP), a version of suppressed carrier quadrature amplitude modulation (QAM). The 10BaseS transport facility can deliver symmetrical data at approximately 13 Mbps (net 10 Mbps) over the unscreened, twisted pair telephone wires originally intended for bandwidths between 300 Hz and 3.4 KHz. The system utilizes frequency division multiplexing (FDM) to separate downstream channels from upstream channels. FDM is also used to separate both the downstream and upstream channels from POTS signals. The downstream and upstream data channels are separated in frequency from bands used for POTS and ISDN, enabling service providers to overlay 10BaseS on existing services.

Claims

1. A point to point facility transport system for the transport of Ethernet frame data over a copper infrastructure connecting a central office facility to a customer premise, comprising:

a downstream transmission path for transporting Ethernet frame data transmitted from the central office facility destined to the customer premise, said downstream transmission path operative to simultaneously carry both voice and Ethernet data signals;

an upstream transmission path for transporting Ethernet frame data transmitted from the customer premise destined to the central office facility, said upstream transmission path operative to simultaneously carry both voice and Ethernet data signals;

said downstream transmission path and said upstream transmission path being symmetrical in data transmission capacity, the Ethernet transmission capacity of said downstream transmission path being substantially the same as the Ethernet transmission capacity of said upstream transmission path;

first modem means located at the central office facility and coupled to one end of said downstream transmission path and one end of said upstream transmission path;

second modem means located at the customer premise and coupled to the other end of said downstream transmission path and the other end of said upstream transmission path; and

wherein said first modem means and said second modem means are operative to place onto and receive from the copper infrastructure data frames encapsulating said Ethernet frame data.

2. The facility transport system according to claim 1, wherein said downstream transmission path utilizes carrierless amplitude modulation phase modulation/quadrature amplitude modulation (CAP/QAM) to transport said Ethernet frame data from said central office facility to said customer premise.

3. The facility transport system according to claim 1, wherein said upstream transmission path utilizes carrierless amplitude modulation phase modulation/quadrature amplitude modulation (CAP/QAM) to transport said Ethernet frame data from said customer premise to said central office facility.

4. The facility transport system according to claim 1, wherein said first modem means and said second modem means further comprise:

transmitter means for coupling to said copper infrastructure, said transmitter means is operative to encapsulate received Ethernet frame data into data frames and to generate a transmit signal therefrom suitable for transmission onto said copper infrastructure; and

receiver means for coupling to said copper infrastructure, said receiver means is operative to de-encapsulate received data frames into Ethernet frame data and to generate a receive data signal therefrom.

5. A point to point facility transport system for the transport of Ethernet frame data and plain old telephone service (POTS) over a copper infrastructure connecting a central office facility to a customer premise, comprising:

a downstream transmission path for transporting Ethernet frame data and POTS transmitted from the central office facility destined to the customer premise;

an upstream transmission path for transporting Ethernet frame data and POTS transmitted from the customer premise destined to the central office facility;

said downstream transmission path and said upstream transmission path being symmetrical in data transmissions capacity, the Ethernet transmission capacity of said downstream transmission path being substantially the same as the Ethernet transmission capacity of said upstream transmission path;

first modem means located at the central office facility and coupled to one end of said downstream transmission path and one end of said upstream transmission path;

second modem means located at the customer premise and coupled to the other end of said downstream transmission path and the other end of said upstream transmission path;

first splitter means coupled to said first modem means and to said copper infrastructure, said first splitter means for combining and splitting Ethernet data signals with voice POTS voice signals;

second splitter means coupled to said second modem means and to said copper infrastructure, said second splitter means for combining and splitting Ethernet data signals with voice POTS voice signals;

wherein said first modem means and said second modem means are operative to place onto and receive from the copper infrastructure data packets encapsulating said Ethernet frame data.

6. The facility transport system according to claim 5, wherein said downstream transmission path utilizes carrierless amplitude modulation phase modulation/quadrature amplitude modulation (CAP/QAM) to transport said Ethernet frame data from said central office facility to said customer premise.

7. The facility transport system according to claim 5, wherein said upstream transmission path utilizes carrierless amplitude modulation phase modulation/quadrature amplitude modulation (CAP/QAM) to transport said Ethernet frame data from said customer premise to said central office facility.

8. The facility transport system according to claim 5, wherein said first modem means and said second modem means further comprise:

transmitter for coupling to said copper infrastructure, said transmitter means is operative to encapsulate received Ethernet frame data into data frames and to generate a transmit signal therefrom suitable for transmission onto said copper infrastructure; and

receiver means for coupling to said copper infrastructure, said receiver means is operative to de-encapsulate received data frames into Ethernet frame data and to generate a receive data signal therefrom.

9. A point to point facility transport system for the transport of Ethernet frame data over a copper infrastructure connecting a central office facility to a customer premise, comprising:

a downstream transmission path for transporting Ethernet frame data transmitted from the central office facility destined to the customer premise, said downstream transmission path operative to simultaneously carry both voice and Ethernet data signals;

an upstream transmission path for transporting Ethernet frame data transmitted from the customer premise destined to the central office facility, said upstream transmission path operative to simultaneously carry both voice and Ethernet data signals;

said downstream transmission path and said upstream transmission path being symmetrical in data transmission capacity, the Ethernet transmission capacity of said downstream transmission path being substantially the same as the Ethernet transmission capacity of said upstream transmission path;

switch means located at the central office facility and coupled to one end of said downstream transmission path and one end of said upstream transmission path;

a network element located at the customer premise and coupled to the other end of said downstream transmission path and the other end of said upstream transmission path;

wherein said switch means and said network element are operative to place onto and receive from the copper infrastructure data frames encapsulating said Ethernet frame data.

10. The facility transport system according to claim 9, wherein said downstream transmission path utilizes carrierless amplitude modulation phase modulation/quadrature amplitude modulation (CAP/QAM) to transport said Ethernet frame data from said central office facility to said customer premise.

11. The facility transport system according to claim 9, wherein said upstream transmission path utilizes carrierless amplitude modulation phase modulation/quadrature amplitude modulation (CAP/QAM) to transport said Ethernet frame data from said customer premise to said central office facility.

12. The facility transport system according to claim 9, wherein said switch means and said network element further comprise:

transmitter means for coupling to said copper infrastructure, said transmitter means is operative to encapsulate received Ethernet frame data into data frames and to generate a transmit signal therefrom suitable for transmission onto said copper infrastructure; and

receiver means for coupling to said copper infrastructure, said receiver means is operative to de-encapsulate received data frames into Ethernet frame data and to generate a receive data signal therefrom.

13. The facility transport system according to claim 9, wherein said network element comprises a modem.

14. The facility transport system according to claim 9, wherein said network element comprises a customer premise local area network (LAN) switch.

15. A transport system for the transport of Ethernet frame data and plain old telephone service (POTS) voice signals over a copper infrastructure connecting a central office facility to a customer premise, comprising:

a private branch exchange (PBX) coupled to said central office facility and operative to receive and transmit voice signals between said central office facility and said customer premise;

a local area network (LAN) coupled to said central office facility and operative to receive and transmit Ethernet data signals between said central office facility and said customer premise;

a first plurality of modems coupled to said LAN and operative to convert Ethernet data signals into analog 10BaseS signals;

a first plurality of splitters coupled to said first plurality of modems and operative to combine and split analog 10BaseS signals and POTS voice signals such that the output of each splitter is a combined voice and data signal;

a second plurality of splitters coupled to said first plurality of modems and operative to receive combined voice and data signals and split in into analog 10BaseS signals and POTS voice signals;

a second plurality of modems coupled to said second plurality of splitters an operative to convert analog 10BaseS signals to Ethernet data signals for transmission to one or more network elements;

a plurality of voice telephone devices coupled to said second plurality of splitters, said plurality of voice telephone devices operative to communicate with said PBX;

wherein Ethernet data is transmitted in both directions between said LAN and said plurality of network elements at a symmetrical data rate;

wherein Ethernet data and POTS voice signals are combined and simultaneously transmitted between said first plurality of splitters and said second plurality of splitters.