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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
3-4 Headset MOTOROLA
Preliminary
System Operational Modes
The headset supports entering Sniff Mode while maintaining an HV2 or HV3 link. This can be achieved in
one of two ways:
1. The AG accepts the Sniff request send by the headset when the data link was established,
without pulling the headset out of Sniff Mode when adding the SCO link.
2. The AG requests to put the headset in Sniff Mode when the SCO link has been established.
3.5 Connection Transfer
If during an ongoing connection the user wishes to stop using the headset, perhaps because the battery is
running low, you can do so without ending the call by transferring the audio end-point from the headset to
the AG (or the equipment to which the AG is connected). Referring to the Bluetooth specification, this is
achieved by the AG, following some sort of user action on the AG
4
. From the headset point-of-view, this
action is identical to releasing (that is, discontinuing) the connection, and is thus similar to the situation
described as “Connection Release”.
The opposite situation occurs if a user wishes to start using the headset for an already ongoing
conversation. This is achieved by pressing the BT button, and is from the headset point-of-view identical to
establishing an outgoing connection (“Outgoing Connection”). Thus, it is completely up to the AG to
distinguish between a connection transfer towards the headset and an outgoing connection establishment.
3.6 Connection Release
When a call is completed, indicate to the AG that the call may be ended. In this situation, the audio link
between AG and headset will have to be released in order to save (particularly headset) power. According
to the Bluetooth specification, the data link must also be released, and the AG is always responsible for
releasing both the audio and data link. The headset merely requests this action. The user canmanually end
the connection/call by pressing the BT button, which will result in a request being sent to the AG to end the
call.
The AG may also end the call on its own, either due to some user action on the AG, or because of other
detected events, such as the remote end hanging up.
The intention of the Bluetooth specification is that when the audio link and upper protocols are released,
there should be no further communication between the headset and AG, that is, they should be completely
disconnected. However, some AGs may want to retain a data connection in order to allow communication
between the headset and AG and speed up the audio re-connection. If this is the case, some action must be
performed on the AG to close the remaining connection down, if you want to connect the headset to a
different AG. The connection will also be automatically dropped if the headset powers off.
3.7 Connection Loss
A special case of connection release occurs when the link is not intentionally released, but is dropped due
to the headset being moved too far away from the AG, or because a considerable obstacle is introduced
between the headset and AG. Most often, the user has been warned of the degrading link quality before the
link is lost, but if the headset is moved away too quickly from the AG, or if a major obstacle is suddenly
introduced, the link quality degradation may be too sudden for the headset to give a warning.
4. According to the Bluetooth specification, the audio end-point is transferred towards the device that initiates the transfer, that is, the device
on which the user action takes place.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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