Freescale Semiconductor, Inc.
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
Freescale Semiconductor, Inc.
System Operational Modes
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
3.2 Incoming Connection
The AG will usually establish a connection to the headset no later than when the AG, or the equipment to which it is connected, initiates an outgoing or detects an incoming “call”, where call might be a connection over the POTS2, a
It is left to the AG to decide if the user should accept the connection on the headset, or if the connection is just added without user interaction. If the user is to be prompted for acceptance, it can either be done by sending a specified RING command to the headset, which will then issue a ring tone in the headset, or by sending an
The headset will allow incoming connections from any Bluetooth device, even if the BD3 addresses of one or more specific devices are stored in the headset. Stored addresses are only used when the headset establishes the connection (see Chapter 3.3, “Outgoing Connection” below).
If the AG requires link level security, the connection can only be accepted if the headset already holds a link key, which will be the case if the AG address has previously been stored in the headset, and the AG at this time requested the use of authentication. In this situation, the headset and AG are said to be bonded to each other, and the process of establishing a bond is referred to as pairing, in Bluetooth terms. Thus, in this situation, the process of storing the AG address in the headset is the equivalent of pairing the headset and AG. The headset can be paired to up to two AGs at a time. Additional devices can still connect to the headset, but without the use of authentication.
Establishing the data connection may take a couple of seconds since the AG has to scan for the headset as the two units may not necessarily be in sync. However, the establishment of the audio connection will be practically instantaneous. The volume setting stored when the headset was last connected is used initially. This setting was reported to the AG when the data link was established.
When connected, the headset abstains from further page and inquiry scans (that is, enters
When an incoming connection has been established, the headset will request entering Sniff Mode, in order to save power. The AG is free to reject this request, but the headset will not repeat the request.
3.3 Outgoing Connection
To actively start a call (phone call,
The “Outgoing Connection” state will be indicated by the headset LED. If a connection attempt is successful, the headset connects the required Bluetooth protocols over the baseband connection, and the Bluetooth
2.Plain Old Telephone System, that is, an analogue phone line, etc.
3.Bluetooth Device address, a universally unique ID number identifying each Bluetooth unit.
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