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The primary function of the BBU is to convert the 12 V battery power to the 48 V line power. The BBU sends battery voltage and unit temperature information to the Operator Console. The two battery connectors on the BBU allow the hot swapping of batteries without powering down the line. To hot swap, plug in a second battery, wait five seconds and remove the original battery.

The BBU contains an integrated line repeater circuit. This circuit allows the use of two line cables between HSLIMs. So the possible distance between the HSLIMs is doubled. The repeater draws power from the 48 V line voltage.


  • Converts battery voltage from 12 V to 48 V
  • Powers one line cable segment (up to 4 HSLIMs)
  • Ethernet repeater