Optical network system and device, and method for controlling optical network and device
First Claim
Patent Images
1. An optical network system comprising:
- a master unit that executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line; and
slave units each of which executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line;
wherein the slave units, from the slave unit at highest rank to the slave unit at lowest rank, are interconnected in the form of a direct chain configuration through an optical transmission line;
the master unit is connected to the slave unit at the highest rank through an optical transmission line, and executes the transmitting and receiving of optical signals between itself and the slave unit of the highest rank through the optical transmission line, and between itself and the slave unit except the slave unit of the highest rank through other slave unit and the optical transmission line located between the slave unit and itself;
the master unit determines whether or not a period during which a specified action is not requested to itself has been continued for a certain period of time or longer; and
when determined as having been continued, transmits an optical signal for polling including a code requiring a predetermined response to the slave unit at the lowest rank;
each of the slave units receives optical signal transmitted thereto through the optical transmission line, generates a clock signal, latches a value represented by the optical signal received in response to the clock signal; and
generates an optical signal representing latched value;
the slave unit at the lowest rank receives the optical signal for polling including the code, transmits the predetermined response to other slave units through the optical transmission line, the predetermined response requesting initialization of clock signals of the other slave units; and
the slave units other than the slave unit at the lowest rank receives the predetermined response, and initialize the clock signals of themselves so as to synchronize with the clock signal generated by the slave unit at the lowest rank.
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Abstract
When entering an idling state, a master unit M transmits an optical signal for polling addressed to each slave unit S-1 to S-n. The slave unit S-n located at the lowest rank of a direct chain constituted by S-1 to S-n, when receiving the optical signal for polling for the self unit, responds by transmitting an optical signal representing a phase correction request signal to the other slave units. The slave units S-1 to S-(n−1) respond to the phase correction request signal, and initialize each clock signal to synchronize with the clock signal of the slave unit S-n at the lowest rank.
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Citations
20 Claims
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1. An optical network system comprising:
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a master unit that executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line; and slave units each of which executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line; wherein the slave units, from the slave unit at highest rank to the slave unit at lowest rank, are interconnected in the form of a direct chain configuration through an optical transmission line; the master unit is connected to the slave unit at the highest rank through an optical transmission line, and executes the transmitting and receiving of optical signals between itself and the slave unit of the highest rank through the optical transmission line, and between itself and the slave unit except the slave unit of the highest rank through other slave unit and the optical transmission line located between the slave unit and itself; the master unit determines whether or not a period during which a specified action is not requested to itself has been continued for a certain period of time or longer; and
when determined as having been continued, transmits an optical signal for polling including a code requiring a predetermined response to the slave unit at the lowest rank;each of the slave units receives optical signal transmitted thereto through the optical transmission line, generates a clock signal, latches a value represented by the optical signal received in response to the clock signal; and
generates an optical signal representing latched value;the slave unit at the lowest rank receives the optical signal for polling including the code, transmits the predetermined response to other slave units through the optical transmission line, the predetermined response requesting initialization of clock signals of the other slave units; and the slave units other than the slave unit at the lowest rank receives the predetermined response, and initialize the clock signals of themselves so as to synchronize with the clock signal generated by the slave unit at the lowest rank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical network device that executes the transmitting and receiving of optical signals externally through an optical transmission line, comprising:
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a clock signal generating section which generates clock signals; and a transmitting and receiving section which receives optical signals externally, latches a value represented by the optical signal in response to the clock signal, and generates and transmits the optical signal representing latched value; wherein the transmitting and receiving section includes; a determining section which determines, when an optical signal for polling including a code requesting a predetermined response, which is addressed to lowest rank optical network device among multiple optical network devices interconnected mutually through an optical transmission line from highest rank to lowest rank, is received, whether or not the optical signal for polling is addressed to itself; and a transmitting section for transmitting, when the determining section determines that the optical signal for polling including the code is addressed thereto, an optical signal representing a correction request requesting at least one external optical network device to initialize a clock signal of the at least one external optical network device to synchronize it with a clock signal generated by the clock generating section thereof. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An optical network control method for controlling an optical network system comprising:
- a master unit that executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line; and
one or more slave units each of which executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line;wherein the slave units, from the slave unit at the highest rank to the slave unit at the lowest rank are interconnected in the form of a direct chain configuration through an optical transmission line; the master unit is connected to the slave unit at the highest rank through an optical transmission line, and executes the transmitting and receiving of optical signals between the slave units and itself through other slave units an optical transmission line located between itself and other slave units; the master unit determines whether or not a period during which a specified action is not requested to itself has been continued for a certain time or longer; and
when it is deemed as having been, transmits an optical signal for polling including a special code requiring a specified response to the slave unit at the lowest rank;each of the slave units generates a clock signal, and latches a value represented by the optical signal received by itself at a timing to synchronize with the clock signal generated by itself; and
generates an optical signal representing the latched value;the slave unit at the lowest rank responds to a special code when it receives the optical signal for polling including the special code; and
transmits an optical signal to the other slave units, the optical signal representing a correction request requesting the initialization of clock signals generated by the other slave units; andthe slave units other than that at the lowest rank respond to the correction request when they receive the optical signal representing the correction request; and
initialize clock signals generated by themselves to synchronize them with the clock signal generated by the slave unit at the lowest rank.
- a master unit that executes the transmitting and receiving of optical signals between itself and other devices through an optical transmission line; and
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20. A method for controlling an optical network device that executes the transmitting and receiving of optical signals externally through an optical transmission line, the method controlling the optical network device to execute;
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a clock signal generating step to generate clock signals; and a transmitting and receiving step to receive an optical signal externally, latch the value represented by the optical signal in synchronization with the clock signal, and generate and transmit the optical signal representing the latched value; wherein the transmitting and receiving step comprises; a determining step to determine, when an optical signal for polling including a code requesting a specified response, which is addressed to lowest rank network device among multiple optical network devices interconnected mutually through an optical transmission line from highest rank to lowest rank, is received, whether or not the optical signal for polling is addressed thereto; and a transmitting step to transmit, when the determining step determines that the optical signal for polling including the special code is addressed thereto, the specified response requesting an external optical network device to synchronize a clock signal of the external optical network device to a clock signal generated by the clock generating step.
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Specification