Wake-on-ring
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Wake-on-Ring (WOR) or Wake-on-Modem (WOM) is a specification that allows supported computers and devices to wake up or turn on from a sleeping, hibernating or soft off state (e.g. ACPI state G1 or G2), and begin operation.
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Wake-on-Ring (WOR) or Wake-on-Modem (WOM) is a specification that allows supported computers and devices to wake up or turn on from a sleeping, hibernating or soft off state (e.g. ACPI state G1 or G2), and begin operation.
The basic premise is that a special signal is sent over phone lines to the computer through its dial-up modem, telling it to fully power-on and begin operation. Common uses were archive databases and BBSes, although hobbyist use was significant.
Excerpted from Wikipedia’s “Wake-on-ring” article, available under the CC BY-SA 4.0 licence.