I found a pretty high level overview of a trading network, I'm guessing a modern trading ticket processing infrastructure environment as shown here: http://www.finwin.com/images/TickerPlan_Diagram.jpg But I'm having a bit of time breaking it all down so anyone who maintains or has designed a trading environment maybe could shed some light. I'm guessing the data coming in from the exchanges are raw data that then get processed by the feed handlers? What is the role of the feed handlers? and ticker feed processor Times ten seems to be a caching rdbms on stereoids where all transactions happen in memory, is this standard in most trading environments?? I've never heard of it till now. What is the role of the ticket planet output network? Is that a vendor provided network? something through reuters, comstock etc..? This information will be really helpfull to me thanks in advance.