ocr: THE MAINFRAME GAME 384Kbos Digitalleasedlne Production site Data center 1.5Mbpsx 2 15Mbpsx2 AS/400 System controi center Overseas branchroffices Branchofice 3Mbpsx2 384Kopsx2 BrE RS/6000 Remote printing and distribution center Branch-ottices Head 4 office = Host == Channel extender = Central Control Unit Figure 1:A common Structure for large banking Retworks i Japani invohres big-iron" toois, such a5 channel extenders, thar are often used to deliver mainfranie performance to devices in remoic areas.