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===Distributed control===
Distributed SPC is both more available and more reliable than centralized SPC. In this, the control function are shared by many processors within the exchange itself. It uses low cost microprocessor. Exchange control may decomposed either horizontally or vertically for distributed processing. <ref>[https://books.google.com/books?id=ghCiNHzWvL4C&pg=PA96&dq=4.3+Distributed+SPC&hl=en&sa=X&ei=ToAhT6fJAsHL0QHhr4zVCA&ved=0CDIQ6AEwAA#v=onepage&q=4.3%20Distributed%20SPC&f=false] T Wiswanathan</ref>
*Vertical decomposition:
*:Whole exchange is divided into several blocks and a processor is assigned to each block. This processor perform all the task related to that specific blocks. Therefore, the total control system consists of several control units coupled together. For redundancy purpose processor may be duplicated in each blocks.
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