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18 Intel ISP1100 Internet Server Product Guide
Wake on Ring/Resume on Ring
Wake on Ring enables the computer to wake from sleep or soft-off mode when a call is received on
a telephony device, such as a faxmodem. The server board provides three methods for
implementing Wake on Ring:
1. An external modem connected to Serial Port A (rear) can toggle the super I/O controller’s Ring
Indicator pin which should be enabled to cause a wakeup event.
2. The 2-pin Wake on Ring header may be shorted to cause a wakeup event.
3. A PCI modem may implement a Wake on Ring circuit that uses PCI PME# to cause a wakeup
event.
This section describes two technologies that enable telephony devices to access the computer when
it is in a power-managed state. The method used depends on the type of telephony device (external
or internal) and the power management mode used (APM or ACPI).
NOTE
Wake on Ring and Resume on Ring technologies require the support of an
operating system that provides full ACPI functionality.
Wake on Ring
The operation of Wake on Ring can be summarized as follows:
1. Powers up the computer from either the APM soft-off mode or the ACPI S5 state.
2. Requires two calls to access the computer:
• First call powers up the computer.
• Second call enables access (when the appropriate software is loaded).
3. Detects incoming call differently for external as opposed to internal modems:
• For external modems, server-board hardware monitors the ring indicate (RI) input of serial
port A and B.
• For internal modems, a cable must be routed from the modem to the Wake on Ring
connector.
See “Server Board Connectors and Components” for the location and definition of the Wake on
Ring connector.
Resume on Ring
The operation of Resume on Ring can be summarized as follows:
1. Resumes operation from either the APM sleep mode or the ACPI S1 state.
2. Requires only one call to access the computer.
3. Detects incoming calls similarly for external and internal modems. Does not use the Wake on
Ring connector.
4. Requires modem interrupt be unmasked for correct operation.