Table16-1 Typesof ma intenance for the crossbar unit
Configuration Active/hot Active/cold Inactive/hot Inactive/cold Systemstopped
Building block configuration
Unsupported Supported (*1) Unsupported Supported Supported(*2 )
*1: Ifany physical partition mounted on tw o or more chassis is currently operating, the crossbar box cannot be powered off.
*2: Allthe physical partitions must be powered off, an dthe s ystem must be completely shut down.
Table16-2 Maintenanceflow
Detailsof update process Replacement
1 Preparation 16.3
2 Removing t he crossbar units 16.4
3 Installing the crossb ar unit 16.5
4 Restoring th e system 16.6
Caution- To completely sh ut down the system, all the power cords must be
removed. If the power cords are not removed, an electrical failure may occur.
Note- Confirm that the POWER LED on the crossbar box is off.

16.2.2 Maintenance flow

Table16-2 lists the sequence of the mai ntenance procedure for the crossbar units.
16.3 Enabling the Removal of a Crossbar
Unit
Thissectio n describes preparation that must be completed prior to removing a
crossbarunit. The preparation procedure differs depending on the maintenance type
asfollows:
■Active/Coldmaintenance
■Inactive/Cold maintenance
■System-stopped maintenance

16.3.1 A ctive/Cold maintenance

Chapter16 Maintainingthe Crossbar Units of the Crossbar Box 299