Packet transmission device and packet transmission system
AssigneeNippon Telegraph and Telephone Corporation
InventorsSatoru Okamoto, Ken-ichi Sato
Life of this patent
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Abstract
The present invention discloses a packet transmission device and a packet transmission system which can realize high-capacity communication. The transmission device transmits packets over a wavelength division multiplexing (WDM) link by mapping the packets into an optical path signal directly without any other medium such as an SDH path. The present invention also discloses a packet transmission device and a packet transmission system which can realize high-capacity communication over an SDH transmission link by mapping the packets directly into an SDH section payload without adding any VC path overhead in order to use the entire SDH section payload area.
Claims36
A circuit for converting packets into an optical path signal, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for converting the packets into a plurality of data streams;
- means for multiplexing the data streams;
- and
- means for generating said optical path signal by adding at least one overhead to the multiplexed data streams.
A circuit for converting packets into an optical path signal which is used for wavelength division multiplexing (WDM) transmission, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for converting the packets into a plurality of data streams by using at least one data link layer process;
- means for multiplexing the data streams by using at least one interleaving process and for generating data which is a unit of said wavelength division multiplexing (WDM) transmission;
- and
- means for generating said optical path signal by adding at least one overhead which is necessary for said wavelength division multiplexing (WDM) transmission to the data.
A circuit for converting an optical path signal into packets, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for separating at least one overhead from said optical path signal;
- means for generating data streams by demultiplexing data of said optical path signal without the overhead;
- and
- means for extracting the packets from the data streams.
A circuit for converting an optical path signal which is used for wavelength division multiplexing (WDM) transmission into packets, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for separating at least one overhead which is necessary for said wavelength division multiplexing (WDM) transmission from said optical path signal;
- means for generating data streams by demultiplexing data of said optical path signal without the overhead;
- and
- means for extracting the packets from the data streams by using at least one data link layer process.
A transmission device for transmitting packets, said transmission device comprising:
- means for converting the packets into a optical path signal and for sending the optical path signal by using wavelength division multiplexing (WDM);
- and
- means for converting the optical path signal which is received into the packets.
A transmission device for transmitting packets, said transmission device comprising:
- a first circuit comprising means for converting the packets into a plurality of data streams, means for multiplexing the data streams, means for generating an optical path signal by adding at least one overhead to the multiplexed data streams and means for sending the optical path signal by using wavelength division multiplexing (WDM);
- and
- a second circuit comprising means for separating at least one overhead from said optical path signal, means for generating data streams by demultiplexing data of said optical path signal without the overhead and means for extracting the packets from the data streams.
A transmission device for transmitting packets by converting the packets into an optical path signal, said transmission device comprising:
- packet mapping means for mapping a plurality of packets into an entire payload area of the optical path signal;
- and
- packet retrieving means for extracting said each packet from the payload area.
A transmission system for transmitting packets, said transmission system comprising:
- a plurality of transmission devices each of which comprises means for converting the packets into an optical path signal and for sending the optical path signal by using wavelength division multiplexing (WDM), and means for converting the optical path signal into the packets;
- and
- means for establishing a connection between said transmission devices by using the optical path signal.
A transmission system for transmitting packets by using wavelength division multiplexing (WDM), said transmission system comprising:
- a plurality of transmission devices each of which comprises:
- a first circuit including means for converting the packets into a plurality of data streams, means for multiplexing the data streams, means for generating an optical path signal by adding at least one overhead to the multiplexed data streams and means for sending the optical path signal by using wavelength division multiplexing (WDM);
- and a second circuit comprising means for separating at least one overhead from said optical path signal, means for generating data streams by demultiplexing data of said optical path signal without the overhead and means for extracting the packets from the data streams;
- and
- means. for establishing a connection between said transmission devices by using the optical path signal.
A transmission system for transmitting packets, said transmission system comprising:
- a plurality of transmission devices each of which comprises packet mapping means for mapping a plurality of packets into an entire payload area of an optical path signal and packet retrieving means for extracting said each packet from the payload area;
- and
- means for establishing a connection between said transmission devices by using the optical path signal.
A method for converting packets into an optical path signal which is used for wavelength division multiplexing (WDM) transmission, wherein said method is used in a transmission device for transmitting packets, said method comprising the steps of:
- converting the packets into a plurality of data streams by using at least one data link layer process;
- multiplexing the data streams by using at least one interleaving process and generating data which is a unit of said wavelength division multiplexing (WDM) transmission;
- and
- generating said optical path signal by adding at least one overhead which is necessary for said wavelength division multiplexing (WDM) transmission to the data.
A method for converting an optical path signal which is used for wavelength division multiplexing (WDM) transmission into packets, wherein said method is used in a transmission device for transmitting packets, said method comprising the steps of:
- separating at least one overhead which is necessary for said wavelength division multiplexing (WDM) transmission from said optical path signal;
- generating data streams by demultiplexing data of said optical path signal without the overhead;
- and
- extracting the packets from the data streams by using at least one data link layer process.
A circuit for converting packets into a signal which is a transmission unit in a synchronous digital transmission standard, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for converting the packets into a plurality of data streams;
- means for multiplexing the data streams without adding any overhead for upper layer transmission;
- and
- means for generating said signal by adding at least one overhead to the multiplexed data streams.
A circuit for converting packets into an STM signal in SDH transmission, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for converting the packets into a plurality of data streams by using at least one data link layer process;
- means for multiplexing the data streams by using at least one interleaving process without adding any overhead of a VC signal and for generating STM data which is a unit of said SDH transmission;
- and
- means for generating said STM signal by adding at least one overhead which is necessary for said SDH transmission to the STM data.
A circuit for converting a signal which is a transmission unit in a synchronous digital transmission standard into packets, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for separating at least one overhead from said signal;
- means for generating data streams by demultiplexing data of said signal without the overhead;
- and
- means for extracting the packets from the data streams.
A circuit for converting an STM signal in SDH transmission into packets, wherein said circuit is used in a transmission device for transmitting packets, said circuit comprising:
- means for separating at least one overhead which is necessary for said SDH transmission from said STM signal;
- means for generating data streams by demultiplexing data of said STM signal without the overhead;
- and
- means for extracting the packets from the data streams by using at least one data link layer process.
A transmission device for transmitting packets, said transmission device comprising:
- means for converting the packets into a signal which is a transmission unit in a synchronous digital transmission standard and for sending the signal by said synchronous digital transmission;
- and
- means for converting said signal into the packets.
A transmission device for transmitting packets by using a transmission unit in a synchronous digital transmission standard, said transmission device comprising:
- a first circuit comprising means for converting the packets into a plurality of data streams, means for multiplexing the data streams without adding any overhead for upper layer transmission, means for generating a signal which is the transmission unit by adding at least one overhead to the multiplexed data streams and means for sending the signal by said synchronous digital transmission;
- and
- a second circuit comprising means for separating at least one overhead from said signal, means for generating data streams by demultiplexing data of said signal without the overhead and means for extracting the packets from the data streams.
A transmission device for transmitting packets by converting the packets into an STM signal, said transmission device comprising:
- packet mapping means for mapping a plurality of packets into an entire section payload area of the STM signal;
- and
- packet retrieving means for extracting said each packet from the section payload area.
A transmission system for transmitting packets, said transmission system comprising:
- a plurality of transmission devices each of which comprises means for converting the packets into a signal which is a transmission unit in a synchronous digital transmission standard, means for sending the signal by said synchronous digital transmission and means for converting said signal into the packets;
- and
- means for establishing a connection between said transmission devices by using said signal.
A transmission system for transmitting packets by using a transmission unit in a synchronous digital transmission standard, said transmission system comprising:
- a plurality of transmission devices each of which comprises:
- a first circuit including means for converting the packets into a plurality of data streams, means for multiplexing the data streams without adding any overhead for upper layer transmission, means for generating a signal which is the transmission unit by adding at least one overhead to the multiplexed data streams and means for sending the signal by said synchronous digital transmission;
- and a second circuit including means for separating at least one overhead from said signal, means for generating data streams by demultiplexing data of said signal without the overhead and means for extracting the packets from the data streams;
- and
- means for establishing a connection between said transmission devices by using said signal.
A transmission system for transmitting packets, said transmission system comprising:
- a plurality of transmission devices each of which comprises packet mapping means for mapping a plurality of packets into an entire section payload area of an STM signal and packet retrieving means for extracting said each packet from the section payload area;
- and
- means for establishing a connection between said transmission devices by using said STM signal.
A method for converting packets into an STM signal in SDH transmission, wherein said method is used in a transmission device for transmitting packets, said method comprising the steps of:
- converting the packets into a plurality of data streams by using at least one data link layer process;
- multiplexing the data streams by using at least one interleaving process without adding any overhead of a VC signal and generating STM data which is a unit of said SDH transmission;
- and
- generating said STM signal by adding at least one overhead which is necessary for said SDH transmission to the STM data.
A method for converting an STM signal in SDH transmission into packets, wherein said method is used in a transmission device for transmitting packets, said method comprising the steps of:
- separating at least one overhead which is necessary for said SDH transmission from said STM signal;
- generating data streams by demultiplexing data of said STM signal without the overhead;
- and
- extracting the packets from the data streams by using at least one data link layer process.
Dependencies are inferred from the claim text.