– 8 –
(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.
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 bat-
tery operation.
This process of stand-by mode operation is as follows.
10 sec
10 sec
Heart-Beat
Heart-Beat
1 sec
1 sec
RX
RX
RX
RX
RX
RX
1 sec
2 msec
2 msec
10 msec
10 msec
RX
TX
RX
Heart Beat
(Exchange A-Frame for Link confirmation purpose)
RX
Heart-Beat
10 sec
Fig. 3-2. Stand-by mode operation (HS)
