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(2) BASE UNIT
The BASE UNIT is supplied the power by AC line. While the
BASE UNIT is the stand-by, the BASE UNIT is always a wake
state. While the BASE UNIT monitors the current channel,
the BASE UNIT monitors also the other channel at the same
time
Because if the current channel can not use by some interfer-
ence, the system needs the clear channel information as a part
of system parameter for a channel hop.
If the BASE UNIT can not receive the A-Frame of Heart-beat
from the HANDSET, it become “link error”, and the system
become error recovery mode.
4. Stand-by Mode Operation
(1) HANDSET
When the HANDSET is the stand-by mode (sleep mode), the
HANDSET do the intermittent operation for power save, be-
cause the HANDSET is the battery 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 (HANDSET)
