Core network system and optical transmission equipment

Optical transmission equipment which constructs a core network system which performs bi-directional optical transmission, comprising:

• a plurality of first transponders provided in a first transmission path for transmitting an optical signal, which is wavelength division-multiplexed, toward subscriber terminals from the core network;
• and
• a plurality of second transponders provided in a second transmission path for transmitting an optical signal, which is wavelength division-multiplexed, from the subscriber terminals to the core network;
• wherein transmission capacity of the second transmission path is smaller than transmission capacity of the first transmission path in agreement with asymmetry of traffic of the second transmission path to the first transmission path.

Optical transmission equipment which constructs a core network system which performs bi-directional optical transmission, comprising:

• a plurality of first transponders provided in a first transmission path for transmitting an optical signal, which is wavelength division-multiplexed, toward subscriber terminals from the core network;
• a plurality of second transponders provided in a second transmission path for transmitting an optical signal, which is wavelength division-multiplexed, from the subscriber terminals to the core network;
• and
• means for lessening transmission capacity of the second transmission path rather than transmission capacity of the first transmission path in agreement with asymmetry of traffic of the second transmission path to the first transmission path.

Optical transmission equipment which constructs a core network system which performs bi-directional optical transmission, comprising:

• a plurality of first transponders provided in a first transmission path for transmitting an optical signal, which is wavelength division-multiplexed, toward subscriber terminals from the core network;
• and
• at least one second transponder provided in a second transmission path for transmitting an optical signal, which is wavelength division-multiplexed, from the subscriber terminals to the core network, and the number of the second transponder is smaller than that of the first transponders;
• wherein the second transponder has an electrical multiplexer which performs electrical multiplexing of signals, which should be transmitted to the second transmission path, in a state of an electric signal, and an electric/optical converter which performs electric/optical conversion of the multiplexed electric signal;
• and
• wherein transmission capacity of the second transmission path is smaller than transmission capacity of the first transmission path in agreement with asymmetry of traffic of the second transmission path to the first transmission path.

Optical transmission equipment which constructs a core network system which performs bi-directional optical transmission, comprising:

• a plurality of first transponders provided in a first transmission path for transmitting an optical signal, which is wavelength division-multiplexed, toward subscriber terminals from the core network;
• at least one second transponder provided in a second transmission path for transmitting an optical signal, which is wavelength division-multiplexed, from the subscriber terminals to the core network, and the number of the second transponder is smaller than that of the first transponders;
• and
• a switch provided between the first and second transponders and the subscriber terminals and assigns transmission routes of the traffic;
• wherein the switch aggregates output ports to the second transponder in agreement with asymmetry of traffic of the second transmission path to the first transmission path, thereby transmission capacity of the second transmission path is smaller than transmission capacity of the first transmission path.

Optical transmission equipment which constructs a core network system which performs bi-directional optical transmission, comprising:

• a plurality of first transponders provided in a first transmission path for transmitting an optical signal, which is wavelength division-multiplexed, toward subscriber terminals from the core network;
• and
• a plurality of second transponders provided in a second transmission path for transmitting an optical signal, which is wavelength division-multiplexed, from the subscriber terminals to the core network;
• wherein the second transponder has a speed converter which decelerates a transmission speed of a signal, which should be transmitted to the second transmission path, in a state of an electric signal, and an electric/optical converter which performs electric/optical conversion of the speed-converted electric signal;
• and
• wherein transmission capacity of the second transmission path is smaller than transmission capacity of the first transmission path in agreement with asymmetry of traffic of the second transmission path to the first transmission path.

A core network system which performs bi-directional optical transmission, comprising:

• a first transmission path for transmitting an optical signal, which is wavelength division-multiplexed, toward subscriber terminals from the core network;
• a second transmission path for transmitting an optical signal, which is wavelength division-multiplexed, from the subscriber terminals to the core network;
• and
• means for lessening transmission capacity of the second transmission path rather than transmission capacity of the first transmission path in agreement with asymmetry of traffic of the second transmission path to the first transmission path.