SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD
A signal processing device is connected to an optical transmitter that transmits an Ethernet signal by optical modulation based on a data signal. The signal processing device includes a mapper unit configured to map a plurality of client signals into a frame signal, an encoder configured to encode the frame signal to generate blocks of a number of bits corresponding to the Ethernet signal, and a signal outputter configured to generate the data signal from the blocks and outputs the data signal to the optical transmitter.
1 . A signal processing device connected to an optical transmitter that transmits an Ethernet signal by optical modulation based on a data signal, comprising:
a mapper unit configured to map a plurality of client signals into a frame signal;
an encoder configured to encode the frame signal to generate blocks of a number of bits corresponding to the Ethernet signal; and
a signal outputter configured to generate the data signal from the blocks and outputs the data signal to the optical transmitter.
2 . The signal processing device as claimed in claim 1 ,
wherein the mapper adds dummy data to the frame signal in accordance with a difference between a data rate of the frame signal and a transmission rate of the Ethernet signal.
3 . The signal processing device as claimed in claim 2 ,
wherein the blocks include a synchronous header for identifying the dummy data and the frame signal, respectively.
4 . The signal processing device as claimed in claim 1 ,
wherein the mapper adjusts a data rate of the frame signal in accordance with a transmission rate of the Ethernet signal.
5 . The signal processing device as claimed in claim 1 ,
wherein the mapper maps dummy data to the frame signal in accordance with a difference between a data rate of the frame signal and a transmission rate of the Ethernet signal.
6 . The signal processing device as claimed in claim 5 ,
wherein the blocks include a synchronization header for identifying the dummy data and the client signal, respectively.
7 . The signal processing device as claimed in claim 5 ,
wherein the mapper inserts an overhead into the frame signal, the overhead including information for identifying a position of the dummy data within the frame signal.
8 . A signal processing device connected to an optical receiver that receives an optically modulated Ethernet signal based on a data signal encoded into blocks of a predetermined number of bits, comprising:
a decoder configured to decode the data signal output by the optical receiver; and
a demapper configured to demap a plurality of client signals from the frame signal obtained by decoding the data signal.
9 . A signal processing method for a data signal input to an optical transmitter that transmits an Ethernet signal by optical modulation based on the data signal, the method comprising:
mapping a plurality of client signals into a common frame signal;
encoding the frame signal to generate blocks of each bit number corresponding to the Ethernet signal; and
generating the data signal from the blocks.
10 . The signal processing method as claimed in claim 9 ,
wherein, in the mapping, a dummy data is added to the frame signal in accordance with a difference between a data rate of the frame signal and a transmission rate of the Ethernet signal.
11 . The signal processing method as claimed in claim 10 ,
wherein the blocks include a synchronous header for identifying the dummy data and the frame signal, respectively.
12 . The signal processing method as claimed in claim 9 ,
wherein, in the mapping, a data rate of the frame signal is adjusted according to a transmission rate of the Ethernet signal.
13 . The signal processing method as claimed in claim 9 ,
wherein, in the mapping, a dummy data is mapped to the frame signal in accordance with a difference between a data rate of the frame signal and a transmission rate of the Ethernet signal.
14 . The signal processing method as claimed in claim 13 ,
wherein the blocks include a synchronization header for identifying the dummy data and the client signal, respectively.
15 . The signal processing method as claimed in claim 13 ,
wherein, in the mapping, an overhead is inserted into the frame signal, the overhead including information for identifying a position of the dummy data within the frame signal.
16 . A signal processing method comprising:
receiving an optically modulated Ethernet signal based on a data signal encoded into blocks of a predetermined number of bits, by an optical receiver;
decoding the data signal output from the optical receiver; and
demapping a plurality of client signals from a frame signal decoded from the data signal.