System and method for linking a VDSL based distribution system with an xDSL based system

• US 6,178,179 B1
• Filed: 12/29/1998
• Issued: 01/23/2001
• Est. Priority Date: 12/29/1998
• Status: Expired due to Term

• Current Assignee: Qwest Communications International Incorporated (Lumen Technologies, Inc.)
• Original Assignee: Qwest Communications International Incorporated (Lumen Technologies, Inc.)
• Inventors: Czak, John M., Phillips, Bruce A., Kung, Darwei, Campbell, Kurt A., Huggins, Joseph P.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Sam, Phirin
• Application Number:
  US09/222,692
• Time in Patent Office: 756 Days
• Field of Search: 370/465, 370/351, 370/352, 370/353, 370/354, 370/359, 370/420, 370/421, 370/422, 370/423, 370/424, 370/428, 370/437, 370/452, 370/460, 370/463, 370/466, 370/467, 375/219, 375/220, 375/221, 375/222, 375/295, 375/316, 379/27, 379/56.2, 379/87, 379/88.07, 379/88.13, 379/283
• US Class Current: 370/465
• CPC Class Codes: H04L 2012/6478 Digital subscriber line, e.g. DSL, ADSL, HDSL, XDSL, VDSL
• CPC Class Codes: H04L 25/05 Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

An xDSL signal distribution system is provided having a DSL translator unit located between a central office XTU unit and a customer location for allowing equipment of multiple types of DSL signal format to be used within the same distribution system. The translator unit is arranged to decode the payload of transmitted signals of one type of DSL format into base digital data. The translator unit then performs line code conversion to a second desired type of DSL code format. In addition, the translator unit employs buffering to allow transmission of the converted xDSL signals at a transmission rate suitable for the type of coding.

Claims

1. A system for distributing multiple types of digital subscriber line (xDSL) signals to end users over a telephone wiring plant comprising:

a central office for receiving video signals from a video source, the central office including a transmission unit for transmitting the received video signals in a particular type of DSL format on a twisted pair copper cable along with other telephony and digital data signals, and a receiver for receiving data signals from end users;

at least one end user location having a transmission unit for receiving video signals from the twisted pair copper cable and transmitting data signals to the central office in a different type of DSL format from the DSL format used by the central office; and

a translator connected to the twisted pair copper cable and located between the central office and the at least one end user location for translating xDSL signals between different DSL formats, the translator comprising;

a receiver for receiving xDSL signals transmitted on the twisted pair copper cable from either the central office or the end user;

a decoder for decoding the payload of a received xDSL signal into base data;

a line code translator for encoding the base data from the DSL format used by the transmitting device into the DSL format used by the destination device; and

a line driver for transmitting the encoded signal onto the twisted pair copper cable for distribution to the receiving device.

2. The system of claim 1 wherein the central office transmits xDSL signal using an asynchronous transfer mode (ATM) protocol, and the translator is arranged to repackage the base data into the ATM protocol format.

3. The system of claim 1 wherein the DSL format used by the central office comprises a very-high-rate digital subscriber line (VDSL) type signal format.

4. The system of claim 3 wherein the DSL signal format used by the end user location comprises a rate adaptive digital subscriber line (RADSL) type signal format.

5. A method for distributing multiple types of digital subscriber line (xDSL) signals to end users over a telephone wiring plant comprising:

receiving video signals at a central office from a video source;

transmitting the received video signals on a twisted pair copper cable along with other telephony and digital data signals as a particular type of DSL formatted signal to a terminal located at an end user site, and receiving data signals on the twisted pair copper cable at the central office from an end user terminal, wherein the end user site receives and transmits signals in a DSL format different than the central office;

at a translator located between the central office and the end user site, receiving transmitted xDSL signals from either the central office or the end user site, and decoding the received xDSL signals into base data;

converting the signal format by encoding the base data from the DSL format used by the transmitting device into the DSL format used by the receiving device; and

transmitting the converted DSL signal to the receiving device.

6. The method of claim 5 further comprising transmitting xDSL signals from the central office transmits using an asynchronous transfer mode (ATM) protocol, and repackaging the base data into the ATM protocol format.

7. The method of claim 5 further comprising transmitting the received video signals from the central office as very-high-rate digital subscriber line (VDSL) type signals.

8. The method of claim 7 further comprising encoding the base data derived from VDSL signals received at the translator in rate adaptive digital subscriber line (RADSL) type signals.

9. A translator for use in a digital subscriber line (XDSL) signal type signal distribution system for translating xDSL signals between different DSL formats, the distribution system including a central office for transmitting video signals on a twisted pair copper cable along with other telephony and digital data signals in one particular type of DSL signal format to at least one end user location which operates in a different type of DSL format, the translator comprising:

a receiver for receiving xDSL signals transmitted on the twisted pair copper cable from either the central office or the end user;

a decoder for decoding the payload of a received XDSL signal into base data;

a line code translator for encoding the base data from the DSL format used by the transmitting device into the DSL format used by the receiving device; and

a line driver for transmitting the encoded signal onto the twisted pair copper cable for distribution to the receiving device.