Practical Applications in Digital Signal Processing

Chapter Eleven. Digital Data Locked Loops

In the previous chapter we saw how elastic store memories are utilized to reclock asynchronous input tributary bit streams prior to being multiplexed into a synchronous output tributary. We utilized two levels of telephone multiplex signals to demonstrate the use of the elastic store memory. Specifically we used elastic store memories to multiplex two asynchronous DS-1 bit streams into a single DS-1C bit stream. Each of the input bit streams were associated with their own independent bit clock and were asynchronous to one another. Once the lower level bit streams are multiplexed into a higher level bit ...