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A selection of the Cisco WPAN advanced range extender models support one battery backup unit (BBU), which provide power to the rang extender if the AC power supply fails or is not available. For more information about the WPAN advanced range extender models that support a BBU, see the “WPAN Range Extender Models Supporting BBUs” section.
This chapter describes the BBU features and installation procedures, and includes the following sections:
This section contains information about:
Table 3-1 details the WPAN range extender models that support a BBU.
The battery backup unit (BBU) provides the WPAN range extender with an emergency power source if the AC power source is unavailable. The unit is mounted in the range extender housing.
Table 3-2 describes the BBU model.
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The BBU is automatically enabled and begins supplying power when the range extender detects that power is not being received from the AC power supply. The BBU continues to supply power to the range extender until at least one of the following conditions is met:
This section describes impact on the range extender configuration and operating capabilities when the range extender switches from AC power to BBU power.
The range extender software configuration is not impacted when the range extender switches from AC power to BBU power.
When the BBU is operating and powering the range extender, the range extender operates and performs normally. The range extender does not power off any interfaces to conserve power when AC power is not available, and the range extender is being powered by the BBU.
It is only possible to use the CG-NMS to upgrade the BBU firmware and to show information about the BBU firmware upgrade.
To upgrade the BBU firmware and to show information about the BBU firmware upgrade, use the CG-NMS firmware upgrade option.
The firmware upgrade is executed in background and an output message is generated in the CG-NMS when the BBU firmware upgrade is complete. During the firmware upgrade, you can use the CG-NMS to view the state of the BBU firmware upgrade.
The BBU configuration during transportation is controlled by a dedicated bit in the BBU NVRAM register called the Transportation bit or (T-bit).
The T-Bit is set at the factory and is used to place the BBU in a disabled (low power) state. This is necessary in order to preserve the battery charge while the WPAN range extender device (with BBU installed) is in storage, or being transported between the factory and the final installation site.
The T-bit in the BBU NVRAM register is set to 1 using the CG-NMS.
Note The T-bit is set to 1 by Cisco manufacturing at the factory. The T-bit is reset to 0 or cleared only by the CG-NMS during ZTD deployment.
In normal operating mode (T-bit is off), the BBU automatically begins to supply power to the range extender when it detects that power is not being received from the AC power supply. You may wish to disable and enable the BBU for the following reasons:
The BBU can be disabled and enabled by using the CG-NMS. These steps are described in the following sections:
For information on how to disable the BBU, see the Cisco Connected Grid Network Management System User Guide.
For information on how to enable the BBU, see the Cisco Connected Grid Network Management System User Guide.
A BBU can only be installed in the WPAN range extender by a Cisco trained technician. Contact your Cisco representative for support.
This section describes the specifications and standards supported by the BBU.
During normal operation, the range extender is powered by the integrated AC power supply. The BBU enters discharge mode and begins providing power to the range extender when the AC power is interrupted outside a range of 85V to 250V for more than 20 ms. The BBU charges or discharges only; it does not support both simultaneously.
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Entry to discharge1 |
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Exit discharge2 |
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Entry to charging limit3 |
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Exit charging4 |
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Short-term: Long-term: |
5.Internal BBU heaters allow the outside ambient temperature to drop much lower than the BBU internal temperature, thereby preserving battery life and expanding the operating temperature. |
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