What is a slip?
To reduce the effects of jitter every device has a receive frame buffer that gets filled up with bits coming off the line. The bits are read out of the buffer by the system clock. If the buffer fills faster than the bits are read out, then the buffer is flushed when it reaches capacity. This results in a loss of 193 bits to the data stream and is called a negative slip. If the buffer fills slower than the bits are read out of the buffer when the buffer runs dry, the last 193 bits in the frame buffer are repeated. This results in a repetition of 193 bits in the data stream and is called a positive slip.
