Sony SPP-SS950 Service Manual page 8

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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 bat-

tery operation.

This process of stand-by mode operation is as follows.

Heart-Beat

10 msec

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 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.

10 sec

Heart-Beat

10 sec

1 sec

2 msec

Fig. 3-2. Stand-by mode operation (HS)

10 sec

10 msec

– 8 –

Heart-Beat

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