User`s guide

UDP and Power Management
100-8006-152G AirborneDirect™ Serial Bridge User’s Guide Page 77
Quatech, Inc. Confidential
POWER MANAGEMENT MODES — UART MODEL ONLY
The Bridge supports several power-management modes that can be used to reduce the
average current consumption. Use the CLI command pm-mode to change the power-
management settings. summarizes the different settings and their affect.
Table 13. Power Management Modes
Power
Management
Mode
Association Wake-Up Methods
Active Associated Already awake
Doze Associated Wireless data or Serial data
Snooze Associated Wireless data or Serial Break
Sleep Disassociated Serial Break character
Off Disassociated Serial Break character
The IEEE 802.11b standard dictates that the AP can reject requests for Low Power operation,
and require the Module to operate in the active mode. The actual current consumption depends
on the AP and its low-power support implementation.
Transitions into the Sleep and Off modes are allowed under control of the Serial Host. Snooze
is intended for network-initiated activity and waking after a UART Break is received. The Module
automatically transitions back to Snooze after 60-to-120 seconds of inactivity. After waking on
receipt of a radio packet, the Module transitions back to Snooze immediately after the processor
idles.
When in Sleep mode, the Module automatically transitions back to Sleep after 60-to-120
seconds of inactivity following waking on UART activity or Radio Transmit.
From the Off mode, the Module goes to the Active state after receiving a UART Break.
It remains in the Active state until the CLI command pm-mode off is issued.