Optical-transceiver control circuit, optical network system, and output control method of optical-transceiver
This invention solves the problem that, if a loss of signal or other anomaly occurs on a line side, intermittent problems occur in a signal outputted to a client side, resulting in trouble with subsequent signal processing. This optical-transceiver control circuit comprises a signal-generating means for generating a dummy signal that has approximately the same characteristics as an electrical signal generated from an optical signal inputted to an optical transceiver, a switching means for receiving an electrical signal and selecting and outputting either the received electrical signal or the generated dummy signal, and a controlling means for changing the signal selected by the switching means from the electrical signal to the dummy signal if a notification indicating an anomaly in the optical signal is inputted.
1. An optical-transceiver control circuit comprising:
a signal generation unit that generates a dummy signal having approximately the same property as an electric signal generated from an optical signal that is input to an optical-transceiver;
a switch unit that receives the electric signal, and selects and outputs any one of the received electric signal and the generated dummy signal; and
a control unit that changes a selection target of the switch unit from the electric signal to the dummy signal when a notification indicating abnormality of the optical signal is input,
wherein
the control unit changes the selection target of the switch unit from the dummy signal to the electric signal after a predetermined time period passes since a notification indicating abnormality of the optical signal is no longer input, and
wherein
the predetermined time period is shorter than a time it takes for the optical-transceiver to perform reception start processing.
2. The optical-transceiver control circuit according to claim 1 , wherein the property is any one of a transfer speed and a mark ratio.
3. The optical-transceiver control circuit according to claim 1 or 2 , wherein the dummy signal is any one of an AIS signal, a program pattern signal, and a clock signal.
4. The optical-transceiver control circuit according to claim 2 , wherein the dummy signal is any of an AIS signal, a program pattern signal, and a clock signal.
5. An output control method of an optical-transceiver, comprising:
receiving an electric signal generated from an optical signal that is input to an optical-transceiver;
generating a dummy signal having approximately the same property as the electric signal;
changing an output target from the electric signal to the dummy signal when a notification indicating abnormality of the optical signal is input; and
changing the output target from the dummy signal to the electric signal after a predetermined time period passes since the notification indicating abnormality of the optical signal is no longer input,
wherein
the predetermined time period is shorter than a time it takes for the optical-transceiver to perform reception start processing.
6. The output control method according to claim 5 , wherein the property is any one of a transfer speed and a mark ratio.
7. The output control method according to claim 5 , wherein the dummy signal is any one of an AIS signal, a program pattern signal, and a clock signal.
8. The output control method according to claim 6 , wherein the dummy signal is any one of an AIS signal, a program pattern signal, and a clock signal.