Upgrading ATM embedded networks to carry IP signals

• US 8,014,405 B2
• Filed: 03/10/2004
• Issued: 09/06/2011
• Est. Priority Date: 03/10/2004
• Status: Expired due to Fees

• Current Assignee: Sbc Knowledge Ventures, L.P.
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Medford, Brad A.
• Primary Examiner(s): Yao; Kwang B
• Assistant Examiner(s): NGUYEN, ANH NGOC M
• Application Number:
  US10/797,913
• Publication Number:
  US 20050201384A1
• Time in Patent Office: 2,736 Days
• Field of Search: 370/395.53, 370/395.52, 370/215, 370/395.51, 370/395.6, 370/395.1, 370/466, 370/389, 370/395.5, 370/203, 370/204, 370/205, 725/118, 375/279, 375/280, 375/315, 375/329, 375/316, 375/295, 375/283
• US Class Current: 370/395.52
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

An Asynchronous Transfer Mode (ATM) signal is phase modulated based on an Internet Protocol (IP) signal to form a combined ATM/IP signal. The ATM signal is phase modulated without exceeding a specified tolerance of symbol period of the ATM signal. The combined ATM/IP signal is communicated on a passive optical network to multiple receiving locations. An ATM stream specific to a receiving location can be extracted from the combined ATM/IP signal by an existing ATM-based optical network termination (ONT). An IP stream can be extracted at a receiving location by phase demodulating the combined ATM/IP signal.

Claims

1. A method comprising:

receiving, at a first input of a phase modulator, a plurality of pulses associated with an asynchronous transfer mode signal, wherein each pulse includes data associated with the asynchronous transfer mode signal, and wherein each pulse is in a symbol period;

receiving, at a second input of the phase modulator, an internet protocol signal;

phase modulating a first pulse of the plurality of pulses by a first shift amount based on a first plurality of bits associated with the internet protocol signal to produce a first combined asynchronous transfer mode/internet protocol signal, the first combined asynchronous transfer mode/internet protocol signal including the first pulse and the first plurality of bits associated with the internet protocol signal, wherein the first shift amount does not exceed a tolerance of the symbol period associated with the first pulse; and

communicating the first combined asynchronous transfer mode/internet protocol signal via an optical medium.

2. The method of claim 1, further comprising:

phase modulating a second pulse of the plurality of pulses by a second shift amount based on a second plurality of bits associated with the internet protocol signal to produce a second combined asynchronous transfer mode/internet protocol signal, the second combined asynchronous transfer mode/internet protocol signal including the second pulse and the second plurality of bits associated with the internet protocol signal, wherein the second plurality of bits is different from the first plurality of bits, wherein the second shift amount does not exceed a tolerance of the symbol period associated with the second pulse, and wherein the first shift amount is different from the second shift amount; and

communicating the second combined asynchronous transfer mode/internet protocol signal via the optical medium.

3. The method of claim 1, wherein the first combined asynchronous transfer mode/internet protocol signal is transmitted via an asynchronous transfer mode-based network comprising a G.983-based network.

4. The method of claim 1, wherein communicating the first combined asynchronous transfer mode/internet protocol signal comprises:

transmitting the first combined asynchronous transfer mode/internet protocol signal via the optical medium to a first optical network termination, wherein the first optical network termination does not include demodulator circuitry; and

transmitting the first combined asynchronous transfer mode/internet protocol signal to a second optical network termination, wherein the second optical network termination includes demodulator circuitry,

wherein the first optical network termination is at a first user location and the second optical network termination is at a second user location, and wherein the first optical network termination is to extract the data associated with the asynchronous transfer mode signal that is uniquely associated with the first user location.

5. The method of claim 1, wherein the first combined asynchronous transfer mode/internet protocol signal is communicated via a passive optical network.

7. The method of claim 1, further comprising demodulating the first combined asynchronous transfer mode/internet protocol signal and outputting an internet protocol stream derived from the first combined asynchronous transfer mode/internet protocol signal.

6. An apparatus to communicate an asynchronous transfer mode signal and an internet protocol signal, the apparatus comprising:

an optical line terminal comprising a phase modulator, the phase modulator configured to;

receive, at a first input of the phase modulator, a plurality of pulses associated with an asynchronous transfer mode signal, wherein each pulse includes data associated with the asynchronous transfer mode signal, and wherein each pulse is in a symbol period;

receive, at a second input of the phase modulator, an internet protocol signal; and

phase modulate a first pulse of the plurality of pulses by a first shift amount based on a first plurality of bits associated with the internet protocol signal to produce a first combined asynchronous transfer mode/internet protocol signal, wherein the first combined asynchronous transfer mode/internet protocol signal includes the first pulse and the first plurality of bits associated with the internet protocol signal, and wherein the first shift amount does not exceed a tolerance of the symbol period associated with the first pulse,

wherein the optical line terminal communicates the first combined asynchronous transfer mode/internet protocol signal via an optical medium.

8. The apparatus of claim 6, wherein the first combined asynchronous transfer mode/internet protocol signal is transmitted via an asynchronous transfer mode-based network comprising a G.983-based network.

9. The apparatus of claim 6, wherein communicating the first combined asynchronous transfer mode/internet protocol signal comprises:

transmitting the first combined asynchronous transfer mode/internet protocol signal via the optical medium to a first optical network termination, wherein the first optical network termination does not include demodulator circuitry; and

transmitting the first combined asynchronous transfer mode/internet protocol signal to a second optical network termination, wherein the second optical network termination includes demodulator circuitry,

wherein the first optical network termination is at a first user location and the second optical network termination is at a second user location, and wherein the first optical network termination is to extract the data associated with the asynchronous transfer mode signal that is uniquely associated with the first user location.

10. The apparatus of claim 6, wherein the first combined asynchronous transfer mode/internet protocol signal is communicated via a passive optical network.

11. The apparatus of claim 6,

wherein the phase modulator is further configured to phase modulate a second pulse of the plurality of pulses by a second shift amount based on a second plurality of bits associated with the internet protocol signal to produce a second combined asynchronous transfer mode/internet protocol signal, the second combined asynchronous transfer mode/internet protocol signal including the second pulse and the second plurality of bits associated with the internet protocol signal, wherein the second plurality of bits is different from the first plurality of bits associated with the internet protocol signal, wherein the second shift amount does not exceed a tolerance of the symbol period associated with the second pulse, and wherein the first shift amount is different from the second shift amount, and

wherein the optical line terminal communicates the second combined asynchronous transfer mode/internet protocol signal via the optical medium.