HP Net Vectra, Техническое справочное руководство

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4 Summary of the HP/Phoenix BIOS
Power Saving and Ergonometry
unsaved files. If there are, it offers three choices:
yes
(to saving the unsaved
changes, followed by shutdown),
no
(thereby shutting down without saving
the changes), and
cancel
(to return to normal operation).
Remote Power-On (RPO)
Remote power-on (RPO) provides a way to turn on the computer from a
communication channel, such as a Network or Modem, using facilities that
have been incorporated in the X-Ben chip and the ExtStart connector. It
allows system administrators, and authorized users, to switch on the
computer from anywhere over an Ethernet network, to perform remote
administration or other tasks, and to return it to
Off or Suspend mode
afterwards.
Magic Packet
Magic packet is a standard for remote power-on and remote wake-up. The
standard defines a Magic Packet frame as the computer’s unique Ethernet
Media Access Control (MAC) address (which it has stored in an EEPROM
on the network board), repeated 16 times and encoded in a valid network
packet.
Any Magic Packet-compatible management application (such as HP Open-
View Workgroup Node Manager ) can send a Magic Packet frame. An
administrator can do this manually, or can incorporate it into a management
script. The packet travels over any type of Ethernet LAN to the target PC.
The only component not completely turned off in the computer is the net-
work chip, which rests in a special low power mode. Power is supplied by a
line called
VStandby , on the External Start connector (see the pin layout in
the table on page 40) as long as the power cord is plugged in. The indepen-
dent mini power supply provides the power necessary to keep one part of
the network chip ready to receive a wake-up signal. This is the only signal it
can respond to in this state.
The network chip sends a signal over the External Start connector, where it
is received by the special network remote power chip. This in turn switches
on the main power supply.
1book.bk : 3ch04.fb4 Page 50 Wednesday, July 23, 1997 10:17 AM