In practice, the range is 2,402 MHz to 2,480 MHz. In Japan the frequency range is 2,472 to 2,497MHz with 23 1-Mhz RF channels. Each channel is divided into time slots 625 microseconds long. A piconet has a master and up to seven slaves. The master transmits in even time slots, slaves in odd time slots.
Packets can be up to five time slots wide.
Data in a packet can be up to 2,745 bits in length. To avoid timing and collision problems, the SCO links use reserved slots set up by the master. Slots not reserved for SCO links can be used for ACL links. One master and slave can have a single ACL link. ACL slaves can only transmit when requested by master.