Transmission system

• US 7,957,429 B2
• Filed: 05/15/2007
• Issued: 06/07/2011
• Est. Priority Date: 10/28/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Rikitake, Nobuhiro, Matsui, Hideki, Takeguchi, Koji, Morita, Hirotaka, Moriya, Ryuchi
• Primary Examiner(s): Hoang; Thai D
• Application Number:
  US11/803,692
• Publication Number:
  US 20070248119A1
• Time in Patent Office: 1,484 Days
• Field of Search: 370/466, 370470-474, 370532-545, 389 43- 51, 389 68- 72, 389 74- 75, 389 79- 95
• US Class Current: 370/536
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04J 2203/0089 Multiplexing, e.g. coding, scrambling, SONET
• CPC Class Codes: H04J 2203/0094 Virtual Concatenation
• CPC Class Codes: H04J 3/0623 Synchronous multiplexing systems, e.g. synchronous digital hierarchy/synchronous optical network (SDH/SONET), synchronisation with a pointer process
• CPC Class Codes: H04J 3/1611 Synchronous digital hierarchy [SDH] or SONET H04J3/1664 takes precedence for interactions with OTN
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

In order to increase the efficiency of large-capacity transmission, the continuity of divided signals generated by dividing a multiplexed signal is maintained and the original large-capacity multiplexed signal is restored. A signal dividing section divides a multiplexed signal to generate a plurality of divided signals in the STS or STM transmission interface format. A guarantee information adding section adds guarantee information for guaranteeing the continuity of the divided signals to each of the divided signals to generate transmission signals. A signal sending section sends the transmission signals via a transmission line in the transmission interface format. A signal receiving section receives the transmission signals. A signal restoring section restores the multiplexed signal by constructing the divided signals on the basis of the guarantee information.

Claims

1. A transmission system comprising:

a transmitting apparatus including;

a signal divider to divide an input electric signal to generate a plurality of divided electric signals in a transmission interface format;

a guarantee information adder to add guarantee information for guaranteeing a continuity of the divided electric signals to each of the divided electric signals; and

a WDM signal transmitter to convert the divided electric signals to which the guarantee information is added into optical signals with wavelength different from one another to perform wavelength multiplexing on the optical signals and send the optical signals, a speed of each of the optical signals being less than a speed of the input electric signal;

wherein the guarantee information adder adds a division identifier at a time of dividing the input electric signal to the divided electric signals as the guarantee information, the divided electric signals being numbered serially in order of division;

a receiving apparatus including;

a WDM signal receiver to receive the optical signals, separate the optical signals according to wavelengths, and convert the optical signals to the divided electric signals including the guarantee information; and

a signal restorer to construct the divided electric signals in numerical order based on the guarantee information to restore the signal.

2. The transmission system according to claim 1, wherein the guarantee information adder further adds at least one of information regarding a type of the concatenation electric signal and a frame number of the concatenation electric signal.

3. The transmission system according to claim 1, wherein the guarantee information adder adds the guarantee information in byte C1 of a relay section overhead for the divided electric signal.

4. A transmitting apparatus comprising:

a signal divider to divide an input electric signal to generate a plurality of divided electric signals in a transmission interface format;

a guarantee information adder to add guarantee information for guaranteeing a continuity of the divided electric signals to each of the divided electric signals; and

a WDM signal transmitter to convert the divided electric signals to which the guarantee information is added into optical signals with wavelengths different from one another to perform wavelength multiplexing on the optical signals and send the optical signals, a speed of each of the optical signals being less than a speed of the input electric signal;

wherein the guarantee information adder adds a division identifier at a time of dividing the input electric signal to the divided electric signals as the guarantee information, the divided electric signals being numbered serially in order of division.

5. A receiving apparatus comprising:

a WDM signal receiver to receive wavelength-multiplexed optical signals, separate the optical signals according to wavelengths, and convert the optical signals to divided electric signals generated by dividing an input electric signal, a speed of each of the optical signals being less than a speed of the input electric signal; and

a signal restorer to restore the input electric signal by constructing the divided electric signals in numerical order based on the guarantee information included in the divided electric signals for guaranteeing a continuity of the divided electric signals;

wherein the guarantee information is a division identifier at a time of dividing the input electric signal to the divided electric signals, the divided electric signals being numbered serially in order of division.