Variable rate high-speed input and output in optical communication networks
First Claim
1. In an optical fiber communication network utilizing frequency division multiplexing, a variable rate input converter comprising:
- a clock and data recovery unit for recovering a first clock signal representing the non-uniform rate of the input signal, and recovering data of the incoming signal;
a demultiplexer coupled to receive the incoming non-uniform rate signal for demultiplexing to form a plurality of separate signals using time division multiplexing techniques;
a buffer coupled to the demultiplexer to receive and store the plurality of separate signals;
a generation unit coupled to receive the separate signals from the buffer, said generation unit transforming the separate signals to one or more pseudo signals comprising a uniform rate within a tolerance range;
a synthesizer coupled to receive the first clock signal from the clock and data recovery unit for generating a second clock signal comprising a uniform rate within a tolerance range for the generated pseudo signal using the recovered first clock signal; and
a control unit communicatively coupled to the clock and data recovery unit, the demultiplexer, the buffer and the generation unit.
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Accused Products
Abstract
In an optical communication network, a variable rate or non-uniform input rate signal is converted to a “pseudo” signal comprising a uniform or standard data rate for the optical communication system. At the receiver, the original non-uniform rate signal is recovered.
Non-uniform signals do not have data rates compatible with the standard transmission rate or rates of the transmission system in which they are to be transmitted. In one version, a “pseudo” signal is generated comprising a data transmission frame format including a payload portion comprising a plurality of subpackets comprising data of the original input signal, and stuff bytes, the stuff bytes comprising null data to fill unused parts of the payload portion.
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Citations
36 Claims
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1. In an optical fiber communication network utilizing frequency division multiplexing, a variable rate input converter comprising:
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a clock and data recovery unit for recovering a first clock signal representing the non-uniform rate of the input signal, and recovering data of the incoming signal;
a demultiplexer coupled to receive the incoming non-uniform rate signal for demultiplexing to form a plurality of separate signals using time division multiplexing techniques;
a buffer coupled to the demultiplexer to receive and store the plurality of separate signals;
a generation unit coupled to receive the separate signals from the buffer, said generation unit transforming the separate signals to one or more pseudo signals comprising a uniform rate within a tolerance range;
a synthesizer coupled to receive the first clock signal from the clock and data recovery unit for generating a second clock signal comprising a uniform rate within a tolerance range for the generated pseudo signal using the recovered first clock signal; and
a control unit communicatively coupled to the clock and data recovery unit, the demultiplexer, the buffer and the generation unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18)
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15. A data transmission frame format for a signal comprising a uniform rate, the format comprising a payload portion comprising a plurality of subpackets, each subpacket comprising data of a non-uniform rate input signal and stuff bytes, the stuff bytes comprising null data to fill unused parts of the payload portion.
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19. In an optical fiber communication network utilizing frequency division multiplexing, means for converting a non-uniform rate input signal to a pseudo signal comprising a uniform rate comprising:
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means for recovering a first clock signal representing the non-uniform rate of the input signal and recovering data of the incoming signal;
means for demultiplexing the incoming non-uniform rate signal into a plurality of separate signals using time division multiplexing techniques;
the means for demultiplexing the incoming non-uniform rate signal being coupled to the means for recovering a first clock signal representing the non-uniform rate of the input signal and recovering data of the incoming signal;
means for receiving and storing the plurality of separate signals;
means for transforming the separate signals to one or more pseudo signals at a uniform rate within a tolerance range, the means for transforming receiving the separate signals at the same time from the means for receiving and storing the plurality of separate signals;
coupled to receive the first clock signal from the means for recovering a first clock signal representing the non-uniform rate, means for generating a second clock signal at a uniform rate within a tolerance range using the recovered first clock signal for the generated pseudo signals; and
means for controlling being communicatively coupled to the means for recovering a first clock signal representing the non-uniform rate, the means for demultiplexing incoming non-uniform rate signal into a plurality of separate signals using time division multiplexing techniques, the means for receiving and storing the plurality of separate signals, the means for transforming the separate signals to a pseudo signal at a uniform rate; and
the means for generating a second clock at a uniform rate for the generated pseudo signal.
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20. In an optical fiber communication network utilizing frequency division multiplexing, a method for converting a non-uniform rate input signal into a uniform rate output signal, the method comprising the steps of:
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recovering a first clock signal representing the non-uniform rate and recovering data of the incoming signal;
demultiplexing the incoming non-uniform rate signal to form a plurality of separate signals using time division multiplexing techniques;
storing the plurality of separate signals; and
transforming the separate signals to one or more pseudo signals at a uniform rate within a tolerance range;
generating a second clock signal at a uniform rate for the generated pseudo signal using the recovered first clock signal. - View Dependent Claims (21, 22, 24, 25, 27, 28, 29, 30, 31)
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26. In an optical fiber communication network utilizing frequency division multiplexing, a variable rate output converter comprising:
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a clock and data recovery unit for recovering a first clock signal representing an incoming pseudo signal and recovering frames of data of the incoming pseudo signal;
a decomposition unit coupled to receive frames of the incoming pseudo signal and extracting original of a non-uniform rate signal from subpackets;
a buffer coupled to the decomposition unit to receive and store the original data bytes;
a multiplexer coupled to receive the original data packets from the buffer and for re-constructing the original non-uniform rate signal from a plurality of original data bytes; and
a synthesizer unit for generating the original non-uniform rate signal using the first clock signal representing the uniform rate;
and a control unit communicatively coupled to the clock and data recovery unit, the multiplexer, the buffer, the synthesizer unit and the decomposition unit.
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32. In an optical fiber communication network utilizing frequency division multiplexing, a method for converting a pseudo signal comprising a uniform rate to a non-uniform rate output signal, the method comprising:
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recovering a first clock signal representing the rate of an incoming pseudo signal;
recovering frames of an incoming pseudo signal;
decomposing the frames of incoming uniform signal and extracting from sub-packets data bytes of a non-uniform rate signal from the pseudo signal;
receiving and storing the original data bytes;
a re-constructing the original non-uniform rate signal from a plurality of original data bytes; and
generating the original non-uniform rate signal using the first clock signal representing the rate of the incoming pseudo signal. - View Dependent Claims (33, 34, 35)
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36. In an optical fiber communication network utilizing frequency division multiplexing, means for converting a pseudo signal comprising a uniform rate to a non-uniform rate output signal comprising:
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means for recovering a first clock signal representing the rate of an incoming pseudo signal further comprising means for recovering frames of an incoming pseudo signal;
coupled to the means for recovering, means for decomposing the frames of the incoming signal and extracting packets comprising data of an original non-uniform rate signal from the pseudo signal;
means for storing the original data coupled to receive the original data from the means for decomposing;
means for re-constructing the original non-uniform rate signal from a plurality of original data bytes, the means for re-constructing coupled to receive the original data bytes from the means for storing; and
means for generating a second clock signal representing the rate of the original non-uniform rate signal using the first clock signal representing the rate of the incoming pseudo signal, said means for generating coupled to receive the first clock signal from the means for recovering and outputting the second clock signal to a means for converting the re-constructed original non-uniform signal to a serial bit stream.
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Specification