1. A method for adjusting a transmission rate of Intersystem Channel (ISC) words from a Generic Framing Procedure (GFP) data mapping device having a FIFO buffer and a transceiver operably coupled to the FIFO buffer, comprising: reading first and second ISC words from the FIFO buffer that were received from a transmitting device; determining whether a first number of ISC words stored in the FIFO buffer is greater than a second predetermined number indicating an over-running condition; determining 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; deleting 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 condition; and reading a third ISC word from the FIFO buffer and transmitting the third ISC word from the transceiver.
1. A method for adjusting a transmission rate of Intersystem Channel (ISC) words from a Generic Framing Procedure (GFP) data mapping device having a FIFO buffer and a transceiver operably coupled to the FIFO buffer, comprising: reading first and second ISC words from the FIFO buffer that were received from a transmitting device; determining whether a first number of ISC words stored in the FIFO buffer is greater than a second predetermined number indicating an over-running condition; determining 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; deleting 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 condition; and reading a third ISC word from the FIFO buffer and transmitting the third ISC word from the transceiver. 2. The method of claim 1 , wherein the step of deleting the first and second ISC words comprises deleting the first and second ISC words if the first and second ISC words comprise a fifth consecutive pair of ISC idle words or a pair of ISC idle words after the fifth consecutive pair of ISC idle words.