100 Chapter 9 Connecting the cables to the BCM50 system
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The expansion port you select determines the line and extension numbers of the devices
connected to the expansion unit. Refer to Table 19 for the default line and extension
numbers.If you have a second expansion unit, repeat steps 1 to 3 for the second unit.
Connecting the power supply
An uninterruptible power supply (UPS) is an optional device that you connect to your BCM50
system. The UPS provides battery backup for the BCM50 system to maintain continuous operation
during power interruption or failure conditions. For more information about the UPS, refer to
“Uninterruptable power supply” on page 50.
When connecting a UPS, you must use a USB hub between the UPS and the BCM50 system.
Figure 44 on page 101 shows how to connect the UPS.
Table 19 Default line and extension numbers
Default
extension numbers*
Default
line numbers*
Main unit
Digital: 221 – 232
Analog: 233 – 236
061 – 064
Expansion port 1
237 – 268 065 – 094
Expansion port 2
269 –300 095 – 124
* The number and type of lines and extensions that are available on the
expansion ports is determined by the MBM you install in the expansion
unit.
Note: For the UPS to function correctly, it must be connected before the BCM50
system is powered up. If you connect a UPS to a running system, the UPS will not
function.
Note: International (non-North American) users might require the power supply
adapter cord to connect the power supply to the special power bar. Refer to the
Appendix, “System region attributes” on page 229 for more information.
