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4. Stand-by Mode Operation (1) HS When the HS is the stand-by mode (sleep mode), the HS do the intermittent operation for power save, because the HS is the battery operation. This process of stand-by mode operation is as follows.
10 sec 10 sec
Heart-Beat
10 sec Heart-Beat 1 sec RX RX RX RX RX RX 1 sec Heart-Beat
1 sec 2 msec 2 msec 10 msec 10 msec
RX
TX RX
RX
Heart-Beat (Exchange A-Frame for Link confirmation purpose)
Fig. 4-2. Stand-by mode operation (HS)
(2) BS The BS is supplied the power by AC line. While the BS is the stand-by, the BS is always a wake state. While the BS monitors the current channel, the BS monitors also the other channel at the same time Because if the current channel can not use by some interference, the system needs the clear channel information as a part of system parameter for a channel hop. If the BS can not receive the A-Frame of Heart-beat from the HS, it become �link error�, and the system become error recovery mode.
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