No.
The frame consists of two packets. (master packet and slave packet)
Since each packet can be 1, 3 or 5 slots, the size of frame is not fixed.
ID packet:
This type of packet is used for paging, inquiry, and responses to paging and inquiries, and the packet contains the DAC or IAC value.
Null packet:
This packet type is made up of only the HAC and the CAC, and no payload. It is generally used to return the status of a previous transmission (the ARQN [...]
YES.
8 node limitation means that
only 8 active node in a piconet in a given time.
Thus, a maximum of seven slaves can be active in a piconet at any given point in time.
If there are more than seven slaves, the rest of the slaves must be “parked.”
3 different packet types are defined for the baseband layer of the Bluetooth system. All higher layers use these packets to compose higher level PDU’s. The packets are ID, NULL, POLL, FHS , DM1 ; these packets are defined for both SCO and ACL links. DH1, AUX1, DM3, DH3, DM5, DH5 are [...]
The criteria for different ACL packet types are
1. number of slots to use for a single packet (1, 3 or 5)
2. use of FEC or not
e.g. DH1, DM3, DH3, DM5, DH5
Three bits for LT_ADDR are the logical transfer address of the slave.
This is assigned during connection establishment.
As three bits are used, up to seven slaves can be addressed.
The access code at the beginning of the packet is used primarily for the identification of the piconet to which the current packet belongs to.
The access code is derived from the device address of piconet master.
From the beginning….
Access code (68-72 bits)
LT_ADDR (3 bits)
Packet Type (4 bits)
Flow (1 bit)
ARQN (1 bit)
SEQN (1 bit)
HEC (8 bit)
Payload (0-2744 bits)
79.
In the United States 83.5MHz of width is available. Seventy-nine 1MHz-wide
channels are defined in this band. Bluetooth uses frequency hopping. The devices of the
piconet hop synchronously over the same hopping sequence consisting of 79 hopping
frequencies.
An ACL (Asynchronous Connection-Less) link provides a packet-switched communications between a master and a slave.
No bandwidth guarantee.
This is a baseband layer concept.
