Patent ID: 7042904

Claim:
A multiple signal transmission method, comprising the steps of: transmitting a signal, in which plural client signals of differing speeds are multiplexed in a SONET/SDH frame, by using plural 8B/10B block coding; and receiving the multiple signal, wherein, the transmitting step includes the steps of concurrently converting the plural client signals, each client signal of a 10B-character form into a GFP frame form by a transparent GFP, the speed of the 10B-character form of each client being different from each other, mapping the client signal converted into the GFP frame form on a predetermined channel of virtual concatenation, and transmitting the SONET/SDH frame, in which the channel is multiplexed, the receiving step includes the steps of receiving the SONET/SDH frame, separating the channel multiplexed on the SONET/SDH frame, detecting the plural client signals of the GFP frame form from the channel, and concurrently converting the plural client signals of the GFP frame form into a 10B-character form by a transparent GFP, the step of converting each client signal of the 10B-character form into the GFP frame form includes the steps of: converting each client signal of a different transmission speed and the 10B-character form into an 8B-byte form to write the signal into a 1st FIFO corresponding to each client signal; synchronizing the client signal converted into the 8B-byte form and written into the 1st FIFO with a clock of a SONET/SDH side to read out the signal; and converting the client signal read out from the 1st FIFO into a GFP frame form, and the step of converting the client signal of the GFP frame form into a 10B-character form includes the steps of: converting the client signal of the GFP frame form into an 8B-byte form to be written into a 2nd FIFO corresponding to each client signal; synchronizing the client signal of the 8B-byte form written into the 2nd FIFO with a clock of each client side to read the signal; and converting the client signal of the 8B-byte form read from the 2nd FIFO through 8B/10B coding into a 10B-character form.