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17.6.1 Active/Hot maintenance 315
17.6.2 Inactive/Hot maintenance 315
17.6.3 System-stopped maintenance 316
Chapter 18 Maintaining the Power Supply Units of the Crossbar Box 317
18.1 Configuration of the Power Supply Units 317
18.2 Before Maintaining a Power Supply Unit 318
18.2.1 Types of maintenance 318
18.2.2 Maintenance flow 319
18.2.3 Precautions for replacement 319
18.3 Enabling the Removal of a Power Supply Unit 319
18.3.1 Active/Hot maintenance 320
18.3.2 Inactive/Hot maintenance 320
18.3.3 System-stopped maintenance 321
18.4 Removing a Power Supply Unit 322
18.5 Installing a Power Supply Unit 323
18.6 Restoring the System 324
18.6.1 Active/Hot maintenance 324
18.6.2 Inactive/Hot maintenance 324
18.6.3 System-stopped maintenance 325
Chapter 19 Maintaining the Fan Units of the Crossbar Box 327
19.1 Configuration of the Fan Units 327
19.2 Before Maintaining a Fan Unit 328
19.2.1 Types of maintenance 329
19.2.2 Maintenance flow 329
19.2.3 Precautions for replacement 329
19.3 Enabling the Removal of a Fan Unit 329
19.3.1 Active/Hot maintenance 330
19.3.2 Inactive/Hot maintenance 330
19.3.3 System-stopped maintenance 331
19.4 Removing a Fan Unit 332
19.4.1 Accessing a fan unit 332
Contents xiii