Sony SPP-S9000 Service Manual page 8

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.
Heart-Beat
RX
10 msec
RX TX RX
Heart Beat
(Exchange A-Frame for Link confirmation purpose)
(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.
8
10 sec
Heart-Beat
10 sec
1 sec 1 sec
RX
RX
1 sec
2 msec
2 msec
Fig. 3-2. Stand-by mode operation (HANDSET)
10 sec
RX RX
10 msec
RX
Heart-Beat
RX