ivWall-mounting 25Placing Units On Top of Each Other 27Stacking Units 27Stacking Two Units 27Stacking Multiple Units 28The Power-up Sequence 30Connecting a Redundant Power System 30Powering-up the Switch 1100 30Checking for Correct Operation 30Choosing the Correct Cables 31Solving Problems Indicated by LEDs 32Managing the Switch 33A S AFETY INFORMATIONImportant Safety Information 36L’information de Sécurité Importante 38Wichtige Sicherheitsinformationen 40B P IN- OUTSNull Modem Cable 41PC-AT Serial Cable 41Modem Cable 42RJ45 Pin Assignments 42C TECHNICAL SPECIFICATIONSD TECHNICAL SUPPORTOnline Technical Services 45World Wide Web Site 453Com FTP Site 453Com Bulletin Board Service 463ComFacts Automated Fax Service 47Support from Your Network Supplier 47Support from 3Com 47Returning Products for Repair 4916950ua.bk Page iv Thursday, August 27, 1998 11:55 AM