Optical multiplex transmission apparatus and optical multiplex transmission method
First Claim
1. An optical multiplex transmission apparatus wherein a plurality of control nodes are connected to an optical multiplex transmission path;
- and each control node performs communication, through a multiplex communication portion for use in multiplex transmission that has been provided therein, with another control node, the each control node comprising;
a light receiving portion that operates by having a power source signal supplied thereto and receives an optical signal from the another control node;
a mode changing-over portion that alternately changes over the mode of the control node between a multiplex communication mode for performing multiplex communication and a sleep mode in which the multiplex communication portion is kept inoperative every prescribed period of time; and
a light reception control portion that has alternately repeated therein a power source supply time length corresponding to the multiplex communication mode during which the power source is supplied and a power source non-supply time length corresponding to the sleep mode during which the power source is not supplied, and that produces a power source supply pulse signal wherein a duty ratio between the power source supply time length and the power source non-supply time length is preset and supplies the power source supply pulse signal to the light receiving portion, whereby when the mode changing-over portion changes over the mode of the control node from the sleep mode to the multiplex communication mode and the light receiving portion has received a light signal, the mode changing-over portion causes the multiplex communication mode to be maintained while the light signal is being received, and the light reception control portion causes the power source to continue to be supplied to the light receiving portion while the light signal is being received.
1 Assignment
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Accused Products
Abstract
In each control node connected to an optical multiplex transmission path, a light receiving portion operates due to supply of a power source and receives an optical signal from another control node. A mode changing-over portion alternately changes over a multiplex communication mode and a sleep mode every prescribed period of time. A light receiving power source control portion and a first switch have alternately repeated therein a power source supply time length corresponding substantially to the multiplex communication mode during which a power source is supplied and a power source non-supply time length corresponding substantially to the sleep mode during which no power source is supplied, and thereby produces a power source supply pulse signal in which the duty ratio between the power source supply time length and the power source non-supply time length is preset and supplies this power source supply pulse signal to the light receiving portion. When the mode changing-over portion changes over the mode of the control node from the sleep mode to the multiplex communication mode and the light receiving portion has received the light signal, the mode changing-over portion causes the multiplex communication mode to be maintained during a time period in which the light signal is being received, and the light reception control portion causes the power source to continue to be supplied to the light receiving portion during a time period in which the light signal is being received.
19 Citations
12 Claims
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1. An optical multiplex transmission apparatus wherein a plurality of control nodes are connected to an optical multiplex transmission path;
- and each control node performs communication, through a multiplex communication portion for use in multiplex transmission that has been provided therein, with another control node, the each control node comprising;
a light receiving portion that operates by having a power source signal supplied thereto and receives an optical signal from the another control node;
a mode changing-over portion that alternately changes over the mode of the control node between a multiplex communication mode for performing multiplex communication and a sleep mode in which the multiplex communication portion is kept inoperative every prescribed period of time; and
a light reception control portion that has alternately repeated therein a power source supply time length corresponding to the multiplex communication mode during which the power source is supplied and a power source non-supply time length corresponding to the sleep mode during which the power source is not supplied, and that produces a power source supply pulse signal wherein a duty ratio between the power source supply time length and the power source non-supply time length is preset and supplies the power source supply pulse signal to the light receiving portion, whereby when the mode changing-over portion changes over the mode of the control node from the sleep mode to the multiplex communication mode and the light receiving portion has received a light signal, the mode changing-over portion causes the multiplex communication mode to be maintained while the light signal is being received, and the light reception control portion causes the power source to continue to be supplied to the light receiving portion while the light signal is being received. - View Dependent Claims (2, 3, 4, 5, 6)
the multiplex communication control portion comprises;
a reception determining portion for determining whether the light receiving portion has received the light signal;
a switch for, when the light receiving portion has received the light signal, permitting the supply of the power source to the multiplex communication portion according to a control signal from the reception determining portion; and
a gate for, when the light receiving portion has received the light signal, permitting the light signal output from the light receiving portion to be input to the multiplex communication portion according to the control signal from the reception determining portion.
- and each control node performs communication, through a multiplex communication portion for use in multiplex transmission that has been provided therein, with another control node, the each control node comprising;
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6. An optical multiplex transmission apparatus according to claim 1, wherein the plurality of the control nodes are connected to one another by the optical multiplex transmission path in the form of a ring.
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7. An optical multiplex transmission method wherein a plurality of control nodes are connected to an optical multiplex transmission path;
- and each control node performs communication, through a multiplex communication portion for use in multiplex transmission that has been provided therein, with another control node, the method comprising the steps of;
alternately changing over the mode of the control node between a multiplex communication mode for performing multiplex communication and a sleep mode in which the multiplex communication portion is kept inoperative every prescribed period of time;
alternately repeating a power source supply time length corresponding to the multiplex communication mode during which the power source is supplied and a power source non-supply time length corresponding to the sleep mode during which the power source is not supplied, and producing a power source supply pulse signal wherein the duty ratio between the power source supply time length and the power source non-supply time length is preset and supplying the power source supply pulse signal to a light receiving portion; and
causing a continuation of the multiplex communication mode during a reception of the light signal and causing a continuation of the supply of the power source to the light receiving portion during the reception of the light signal, when the mode of the control node has been changed over from the sleep mode to the multiplex communication mode and the light receiving portion has received the light signal. - View Dependent Claims (8, 9, 10, 11, 12)
- and each control node performs communication, through a multiplex communication portion for use in multiplex transmission that has been provided therein, with another control node, the method comprising the steps of;
Specification