8. A Generic Framing Procedure (GFP) data mapping device for adjusting a transmission rate of ISC words, comprising: a transceiver configured to receive ISC words and to transmit ISC words; a FIFO buffer operably coupled to the transceiver configured to store ISC words received by the transceiver; and a processor operably coupled to the FIFO buffer, the processor configured to read first and second ISC words from the FIFO buffer; the processor further configured to determine whether a first number of ISC words stored in the FIFO buffer is greater than a second predetermined number indicating an over-running condition; the processor further configured to determine whether the first and second ISC words indicate either an ISC continuous sequence of words or an ISC idle sequence of words only if the first number of ISC words is greater than the second predetermined number; the processor further configured to delete the first and second ISC words only if the first and second ISC words indicate either the ISC continuous sequence of words or the ISC idle sequence of words, and the first number of ISC words is greater than the second predetermined number indicating the over-running; and the processor further configured to read a third ISC word from the FIFO buffer and to induce the transceiver to transmit the third ISC word.
12. The data mapping device of claim 8 , wherein the processor is farther configured to determine whether the first number of ISC words stored in the FIFO buffer is less than a third predetermined number indicating an under-running condition, the processor further configured to determine whether the first and second ISC words indicate an ISC idle sequence of words, if the first number is less than the third predetermined number, the processor further configured to induce the transceiver to transmit third and fourth ISC idle words if the first and second ISC words indicate the ISC idle sequence of words.