HP LaserJet Pro M521 Multifunction Printer series - Manual (Page 145)

Security issues when connecting internal networks to public phone
lines
The product can send and receive fax data over telephone lines that conform to public switch telephone
network (PSTN) standards. The secure fax protocols make it impossible for computer viruses to be
transferred from the telephone line to a computer or network.
The following product features prevent virus transmission:
● No direct connection exists between the fax line and any devices that are connected to the USB or
Ethernet ports.
● The internal firmware cannot be modified through the fax connection.
● All fax communications go through the fax subsystem, which does not use Internet data-exchange
protocols.
Fax from the flatbed scanner
1. Place the document face-down on the scanner
glass.
NOTE: If documents are in the document
feeder and on the scanner glass at the same
time, the product processes the document in
the document feeder and not the one on the
scanner glass.
2. From the Home screen on the product control
panel, touch the Fax button.
3. Use the keypad to enter the fax number.
4. Touch the Start Fax button.
5. The product prompts you to confirm that you
are sending from the scanner glass. Touch the
Yes button.
6. The product prompts you to load the first page.
Touch the OK button.
ENWW Use fax 131