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Desktop Board Features
21
Wake on Ring
The operation of Wake on Ring can be summarized as follows:
• Powers up the computer from the APM soft-off mode.
• Requires two calls to access the computer:
The first call powers up the computer.
The second call enables access (when the appropriate software is loaded).
• Detects incoming call differently for external as opposed to internal modems:
For external modems, hardware on the desktop board monitors the ring indicate (RI) input
of serial port A (serial port B does not support this feature).
For internal modems, a cable must be routed from the modem to the Wake on Ring
connector.
See Figure 22 on page 67 for the location of the Wake on Ring connector on the desktop board.
Resume on Ring
The operation of Resume on Ring can be summarized as follows:
• Resumes operation from either the APM sleep mode or the ACPI S1 state
• Requires only one call to access the computer
• Detects incoming call similarly for external and internal modems; does not use the Wake on
Ring connector
• Requires modem interrupt be unmasked for correct operation