Sony SPP-SS964 Service Manual page 14

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.
Heart-Beat
RX
10 msec
RX TX
Heart-Beat
(Exchange A-Frame for Link confirmation purpose)
(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 moni-
tors the current channel, the BS monitors also the other chan-
nel 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 BS can not receive the A-Frame of Heart-beat from the
HS, it become "link error", and the system become error re-
covery mode.
Heart-Beat
1 sec
RX
RX
1 sec
2 msec
2 msec
RX
Fig. 4-2. Stand-by mode operation (HS)
10 sec 10 sec
10 sec
1 sec
RX
– 14 –
Heart-Beat
RX RX
10 msec
RX