Canon H12157 - Manual (Page 287)

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Chapter 13 Frequently Asked Questions 13-39
If the Power Goes Out
If power to the LASER CLASS 2060P is cut off, any documents stored in
its fax memory will be retained for approximately one hour by a built-in
battery.
While power is out, you can only use the LASER CLASS 2060P to receive
telephone calls (if you have the handset or a telephone connected to the
unit) and to make calls (if you have a telephone connected to the unit).
You cannot send or receive faxes.