-70-
v6.3
802.15.4/ZigBee
8.2. XBee - ZigBee
Module
Frequency
Transmission Power
Sensitivity
Number of channels
Distance
XBee-ZB-PRO
2,40 – 2,70GHz
50mW
-102dBm
14
7000m
Figure: XBee ZigBee PRO
As ZigBee is supported in the IEEE 802.15.5 link layer, it uses the same channels as described in the previous section, with the
peculiarity that the XBee-ZB-PRO model limits the number of channels to 13.
The XBee-ZB modules comply with the
ZigBee-PRO v2007
standard. These modules add certain functionalities to those
contributed by ZigBee, such as:
•
Node discovery:
some headings are added so that other nodes within the same network can be discovered. It allows a
node discovery message to be sent, so that the rest of the network nodes respond indicating their specific information
(Node Identifier, @MAC, @16 bits, RSSI).
•
Duplicated packet detection:
This functionality is not set out in the standard and is added by the XBee modules.
The topologies in which these modules can be used are: star and tree.
Figure: Star topology