Digi XBee S2C Zigbee User Manual page 71

Zigbee networks
The Zigbee specification defines the Network (NWK) layer and the framework for the application (APL)
layer. The Network layer takes care of the network structure, routing, and security. The application
layer framework consists of the Application Support sub-layer (APS), the Zigbee device objects (ZDO)
and user-defined applications that give the device its specific functionality.
This table describes the Zigbee layers.
Zigbee layer Descriptions
PHY Defines the physical operation of the Zigbee device including receive sensitivity,
channel rejection, output power, number of channels, chip modulation, and
transmission rate specifications. Most Zigbee applications operate on the 2.4 GHz
ISM band at a 250 kb/s data rate. See the IEEE 802.15.4 specification for details.
MAC Manages RF data transactions between neighboring devices (point to point). The
MAC includes services such as transmission retry and acknowledgment
management, and collision avoidance techniques (CSMA-CA).
Network Adds routing capabilities that allows RF data packets to traverse multiple devices
(multiple hops) to route data from source to destination (peer to peer).
APS (AF) Application layer that defines various addressing objects including profiles,
clusters, and endpoints.
ZDO Application layer that provides device and service discovery features and advanced
XBee/XBee-PRO® S2C Zigbee® RF Module User Guide
network management capabilities.
Zigbee stack layers
71