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T ERMS & DEFINITIONS
4
Ad-Hoc Network: A wireless network composed of communicating devices without preexisting infrastructure.
Typically created in a spontaneous manner and is self-organizing and self-maintaining.
Association: The process of joining a ZigBee PAN. A device joins the Network by joining a Coordinator or Router
which has previously associated with the Network. Upon joining, the Parent device issues a 16-bit Network Address
to the device.
Broadcast: Broadcast packets are sent to multiple radios. The ZB2430 allows several different broadcast types
including broadcast to all devices & broadcast to Coordinator & all Routers.
Broadcast jitter: The random delay which is automatically introduced by a device before relaying a broadcast packet
to prevent packet collisions.
Channel: The frequency selected for data communications within the PAN. The channel is selected by the Network
Coordinator on power-up.
Channel Mask: The Channel Mask is a 32-bit field which specifies the range of allowable channels that the radio has
to select from when choosing an RF channel. Valid only when Channel Select mode is enabled in EEPROM.
Clear Channel Assessment: An evaluation of the communication channel prior to a transmission to determine if the
channel is currently occupied.
Energy Scan: A sweep of the entire frequency band which reports noise readings on every channel & is also capable
of detecting Coordinators and reporting their Channel location.
FFD: Full Function Device. The Network Coordinator & Routers are examples of FFD’s.
IEEE 802.15.4: IEEE standard for Low-Power Wireless Personal Area Networks (WPAN’s). Specifies the physical
interface between ZigBee devices.
MAC Address: A unique 64-bit address assigned to each radio. This address cannot be modified and never changes.
It is used by the network to identify the device when assigning 16-bit Network Addresses.
Maximum Network Depth: The maximum number or Routers (hops) that a device can be away from the Coordinator.
The current profile limit is 5.
Maximum Number of Routers: The total number of children that can serve as Routers for a Network device. The
current profile limit is 6.