User's Manual

29/OCT/2014 REVIEW DRAFT — CISCO CONFIDENTIAL
3-4
Cisco IR500 Series WPAN Gateway and Range Extender Installation and Configuration Guide
Chapter 3 Battery Backup Unit
BBU Configuration during Transportation
BBU Configuration during Transportation
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 (lo
w 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.
This sections contains:
• Setting the BBU NVRAM Register T-bit, page 3-4
• BBU NVRAM Register T-bit Settings and BBU Status, page 3-4
Setting the BBU NVRAM Register T-bit
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.
BBU NVRAM Register T-bit Settings and BBU Status
Ta b l e 3-3 BBU NVRAM T-bit Settings and BBU Status
T-bit Setting BBU Status
T-bit = 1
• AC ON: BBU enabled automatically (to allow battery to charge)
• AC OFF: BBU disabled automatically (to prevent battery from
discharging)
T-bit = 0 The BBU can be set to a disabled or enabled status for AC ON or OFF
con
ditions.
Note If the BBU is disabled due to being < 5% capacity, it will be
enabled automatically when AC power resumes. If the customer
disables the BBU, the customer must enable the BBU manually.
Disabling and Enabling the BBU in the Range Extender
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:
• To inhibit the BBU discharge during storage, shipping or transportation in order to preserve battery
life.
• To replace the battery in an installed and operating range extender.