Nortel Networks BCM50 - Manual (Page 52)

52 Chapter 2 Introducing the BCM50 hardware
NN40020-302
The USB port on the UPS uses a different communication speed than the USB port on the BCM50
system. Due to this difference, you must use an industry-standard USB hub (USB 1.1-compatible)
to connect the UPS data connection to the BCM50 system. The USB hub not only provides
additional USB ports, it converts the data communication speed so the UPS and BCM50 system
can communicate properly.
On BCM50 systems with more than one unit, you must connect the power supplies for all the units
must to a single UPS.
The interaction between the UPS and the BCM50 occurs in three stages:
1 Configuration—This stage sends configuration information to the UPS device and requires
minimal user interaction.
2 Monitoring—This stage is a steady-state, periodic monitoring cycle where the BCM50 reads
the status of the UPS. This stage requires minimal user interaction.
3 Failure condition—This stage initiates an action when a threshold value is surpassed.
The BCM50 system requires user interaction in the case of a planned system shutdown. You must
manually power down the UPS and the BCM50 main unit when performing a system shutdown.
The UPS feature is supported in all markets (110~120V and 220~240V power standards).
Hard disk
Each main unit contains a single hard disk and a hard disk bracket to install it in the main unit. See
the figure
Hard disk and bracket on page 53.
For installation and replacement instructions, see Replacing an internal component on page 189.
Note: For the UPS to function correctly, you must connect it before you power up
the BCM50 system. If you connect a UPS to a running system, the UPS does not
function.