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지그비 FAQ
Technology
- What is the ZigBee?
ZigBee is a low date rate, low cost, low power consumption, and wireless networking protocol targeted towards automation and remote applications. - How many ZigBee devices in the one ZigBee Network?
64K devices - ZigBee Devices types in the ZigBee Network?
Coordinator, Router and End Device - What are the states of the ZigBee End Device?
Active and Sleep - How many ZigBee Coordinator's in one ZigBee Network?
1 (ONE) - How can we identify the particular ZigBee device in the ZigBee Personnel area network?
PAN ID. It is the 16 bit number. - Which ZigBee device can form the Personnel Area Network (PAN)?
Coordinator - ZigBee Router and ZigBee End Device can form the ZigBee Network?
No - Maximum hop count in the one ZigBee Network?
30 - What happens to the radio if the ZigBee End device goes sleep?
ZigBee End device turns off the radio to save the power - What happens to the ZigBee End device receives a data when it asleep?
It wakes up and processing the data - ZigBee Network data rate?
250 Kbps - What happens if ZigBee Coordinator disappeared from the ZigBee Network after forming the ZigBee Network?
If you are not using ZigBee security, you can keep the ZigBee Network without ZigBee Coordinator and even you can make ZigBee Router or End device join the network
But if you are ZigBee security, you can keep the network but you cannot make ZigBee Router or End Device join the network. - Is it possible to have a Backup ZigBee Coordinator in the ZigBee network?
You cannot run a backup ZigBee Coordinator in a ZigBee network at the same time if a ZigBee Coordinator is running. - What is the Network address of the ZigBee Coordinator, Router and End device?
ZigBee Coordinator network address is 0x0000. ZigBee Router and End device don’t have default network address. - ZigBee protocol packet size?
Total packet size: 128 Bytes
Without Security:
ZigBee Header: 28 bytes, Data: 100 bytes
With Networking security:
ZigBee Header: 28 bytes, Network security header: 18, Data: 82 bytes
With Application security:
ZigBee Header: 28 bytes, Network security header: 18, Application Security header: 8 Data: 82 bytes - What is the purpose of the End Point in the ZigBee Network?
- Endpoints allow for different application profiles to exist within each node.
- Endpoints allow for separate control points to exist within each node.
- End points allow for separate devices to exist within each node
- Networking Latency of the Sleeping ZigBee End Device changing to the active state?
It wakes up from asleep after 30ms - Different broadcast types in the ZigBee Network?
- 0xffff - Broadcast to all nodes
- 0xfffd - Broadcast to all non-sleeping nodes
- 0xfffc - Broadcast to routers only (including the ZigBee Coordinator)
- Are ZigBee networks secure?
The ZigBee specification includes provisions for security and data integrity based on access control lists, packet freshness timers and 128-bit AES encryption
Features
- ZigBee Pro supports Source routing, Fragmentation and Multicasting?
YES - ZigBee Pro supports Unicast, Multicast and Broadcast Control?
YES. Unicast control means control operation between two ZigBee devices in the ZigBee network. Multicast control means control operation between one to group of ZigBee devices in the ZigBee network. Broadcast control means control operation between one to all devices in the ZigBee network. - ZigBee networks are extendable networks?
Yes. Use a ZigBee Router to enhance the mesh in the network. ZigBee Routers can extend the range of the network and increase its reliability - What network topologies supported by the ZigBee?
Peer to Peer, Star, Mesh and Cluster Tree Networks
- Which feature in the ZigBee stack eliminates the interference between ZigBee, Bluetooth and Wi-Fi?
Frequency Agility. ZigBee2007/ZigBee PRO stack supports the Frequency Agility. Zigee2006 stack don’t support the Frequency Agility. - What is the Frequency Agility?
The ultimate feature to mitigate interference is the ability to move a ZigBee network to another channel while in operation. This is called Frequency Agility and included in the ZigBee2007/ZigBee PRO stack specification. ZigBee2007/ZigBee PRO stack uses the Frequency Agility eliminate the interference with the WiFi and Bluetooth. - ZigBee Pro supports Home Automation profile?
YES. ProBee-ZE20S firmwares for Combined Interface profile, Door Lock profile and Color Dimmable On/Off Light profile are now provided.
Contact our Customer Support team if you are interested in such profiles as Switch (On/Off Switch, Level Control Switch, Switch Controller), Sensor (Temperature Sensor, Pressure Sensor, Simple Sensor), Mains Power Outlet, Range Extender, Smart Plug, Thermostat and Heating/Cooling Unit. - ZigBee Pro supports Smart Energy profile?
YES. ProBee-ZE20S firmwares for Energy Service Interface profile, In-Premises Display Device profile and Metering Device profile are now provided.
Contact our Customer Support team if you are interested in such profiles as Programmable Communicating Thermostat, Smart Appliance, Load Control, Range Extender and Prepayment Terminal.
Marketing
- Is it possible to deploy ZigBee networks in sub-GHz bands?
Yes, it is. ZigBee can use IEEE 802.15.4 physical interfaces transmitting at 868 MHz or 915 MHz. Data rates are reduced to 20 kbps and 40 kbps, respectively. The rest of the protocol stack is the same as in ZigBee implementations at 2.4 GHz. - Is ZigBee a competitor for Bluetooth?
ZigBee and Bluetooth have been developed to serve different applications. Bluetooth targets higher data rates and better QoS to transport richer media such as audio. ZigBee conveys much simpler messages across more scalable networks that require very low duty cycling without close synchronization. - Is ZigBee a competitor for Wi-Fi (IEEE 802.11b/g)
ZigBee and Wi-Fi clearly address very distinct application requirements. Low Cost and power consumption patterns of Wi-Fi cannot fit wireless control needs, whereas ZigBee’s bandwidth is by far too low to transmit large data flows. - What can ZigBee network contain?
The target networks encompass a wide range of devices with low data rates in the Industrial, Scientific and Medical (ISM) radio bands, with building-automation controls like intruder/fire alarms, thermostats and remote (wireless) switches, video/audio remote controls likely to be the most popular applications. So far sensor and control devices have been marketed as proprietary items for want of a standard. With acceptance and implementation of ZigBee, interoperability will be enabled in multi-purpose, self-organizing mesh networks. - How many nodes, or devices, can a ZigBee network support?
ZigBee's addressing scheme is capable of supporting more than 64K per network and multiple network coordinators can be linked together to support extremely large networks. The logical size of a ZigBee network ultimately depends on which frequency band is selected, how often each device on the network needs to communicate, and how much data loss or retransmissions can be tolerated by the application. Networks have been tested up to 1000 nodes but practical usage is dependant upon data rate. - What is the advantage of the ZigBee solution over proprietary solutions?
The main advantages include product interoperability, vendor independence, and accessibility to broader markets. Customers can expect increases product innovation as a result of the industry standardization of the physical radio and logical networking layers.
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