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我说错了。这个就是停电的时候的备用电源。
https://www2.nbnco.com.au/reside ... up-information.html
In some instances, providers will install an optional battery backup in the nbn™ supplied Power Supply unit in your premises. This battery backup will supply emergency power to the nbn™ connection box in the event of an extended power outage. If your provider is installing a Power Supply unit with battery backup at your premises, the battery will be included.
In the case of a power outage, the battery backup will last up to approximately five hours. You will know when it's time to replace the battery when you see a red light appear next to ‘Replace Battery’ on the nbn™ connection box. You will also hear an alarm sound – one beep every 15 minutes indicates the battery needs replacing, and four beeps every minute indicates less than half of the battery charge is remaining. |
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