Upgrading ATM embedded networks to carry IP signals
First Claim
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1. A method comprising:
- phase modulating an Asynchronous Transfer Mode (ATM) signal based on an Internet Protocol (IP) signal to form a combined ATM/IP signal.
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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.
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Citations
18 Claims
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1. A method comprising:
phase modulating an Asynchronous Transfer Mode (ATM) signal based on an Internet Protocol (IP) signal to form a combined ATM/IP signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of upgrading an embedded Asynchronous Transfer Mode (ATM)-based passive optical network (PON) having a plurality of existing ATM-based optical network terminals (ONTs), the method comprising:
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upgrading an optical line terminal (OLT) to comprise a phase modulator to modulate a phase of an ATM signal based on an Internet Protocol (IP) signal;
replacing at least one of the existing ATM-based ONTs with an IP-based ONT having a phase demodulator;
generating, at the OLT, a combined ATM/IP signal by phase modulating the ATM signal based on the IP signal;
communicating the combined ATM/IP signal to multiple locations via the PON;
receiving the combined ATM/IP signal at one or more ATM locations having an existing ATM-based ONT;
extracting, at each of the ATM locations, a respective ATM stream specific to the location from the combined ATM/IP signal using its existing ATM-based ONT;
receiving the combined ATM/IP signal at one or more IP locations having an IP-based ONT; and
extracting, at each of the IP locations, an IP stream by phase demodulating the combined ATM/IP signal. - View Dependent Claims (10, 11)
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12. An optical network terminal (ONT) comprising:
a phase demodulator to phase demodulate a combined Asyncrhonous Transfer Mode (ATM)/Internet Protocol (IP) signal to extract an IP stream. - View Dependent Claims (13, 14)
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15. An optical line terminal (OLT) comprising:
a phase modulator to phase modulate an Asynchronous Transfer Mode (ATM) signal based on an Internet Protocol (IP) signal to form a combined ATM/IP signal. - View Dependent Claims (16, 17, 18)
Specification