tions are The paging procedure is quite similar to that of the in- made and dissolved with relative frequency. To make quiry. However, now the master knows the paged devi- a new connection, the initiator-the master-must know ce's address and can use it to form the synchronization the address of the new slave, and the slave has to syn- word in its access code. The designated slave does its chronize its clock to the master's in order to align page scan while expecting the access code derived from transmit and receive channel hop-timing and frequen- its own address. The hopping sequence is different cies. The inquiry and paging procedures are used to during paging than during inquiry, but the master's create the connections between devices in the piconet. transmission bursts and the slave's scanning routine are By use of the inquiry procedure, a connection initiator very similar. creates a list of Bluetooth devices within range. Later, A diagram of the page state transmissions is given in desired units can be summoned into the piconet of which Figure 5.2-20. When the slave detects a transmission the initiator is master by means of the paging routine. from the master (Step 1), it responds with a burst of As mentioned previously, the access code contains access code based on its own Bluetooth address. The a synchronization word based on the address of the master then transmits the FHS, giving the slave the master. During inquiry, the access code is a general access code information (based on the master's address), CHAPTER 5.2 Short-range wireless applications and technologies NOT RECEIVED NORMAL TRAFFIC MASTER NORMAL TRAFFIC SLAVE STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 STEP 6 Figure 5.2-20 Paging transmissions. timing and piconet active member address (between one Architecture and seven) needed to participate in the network. The slave acknowledges FHS receipt in Step 4. Steps 5 and 6 The basic architecture of Zigbee is similar to that of other show the beginning of the network transmissions which IEEE standards, Wi-Fi and