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| FAQS |
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| Q: How does Lattice Wireless MESH Networking works? |
It works on :
- IEEE 802.15.4 Low Power Radio Standards
- Radio Frequency 2.45Ghz
- No license requirement
- Co exist with WiFi System
- Each Controller is a node for another controller
- Automatic packet routing
- Multiple path routing to increase reliability
- AES-128 bits encryption with automatic key rotation
- Line of Sight Distance: 400meters from controller to controller
- Indoor Distance: 30 to 50 meters from controller to controller
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| Q: What if the Wireless Communication Fails? |
There will be times when there are strong interference on the wireless radio spectrum. The Lattice Wireless Access Control will continue to work without any degradation as the database is kept in the controller. Only the transactions will be delayed until the wireless recovers. Its robust protocol will ensure that all the transactions are downloaded accurately.
If installation of cards are required when the communication fails, the software will create a background task which will wait for the wireless to recover and then install the cards. Once successful, the action will be reported to the user |
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| Q: What is the baud rate of the wireless network? |
| 250kbps |
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| Q: How Many Controllers can be connected in a single Network? |
| 250 Controllers |
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| Q: If there are so many controllers, how long does it take for the transaction to arrives at the Server? |
The Server can poll up to 5 controllers per second. For 250 controllers, it takes up to 50 seconds to poll every controller.
The controllers have a broadcast mode which can send the transactions to the Server instantly without polling. The delay is less that 1 second. The Server will still poll the controller to make sure that it is still connected. |
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| Q: How secure is the Wireless Communication? |
The wireless uses AES-128 bits encryption. This is the same encryption used by the US government. (see Wikipedia)
A range of auto generated rotating Encryption Keys are used by the lattice controller.
Beside encryption, all data packet have sequence number and the system will detect a wrong sequence number.
Controller and wPCI have unique customer code which prevents access to another network controllers.
The Wireless is NOT WiFi, which makes it harder to hack. |
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| Q: Why is the Wireless System Low Cost? |
| IEEE 802.15.4 is a low power radio standard. The transceiver consists of simple low power radio circuits. Most of the network routing capability are implemented in the controller software. |
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| Q: Why no one else have such a system? |
The IEEE 802.15.4 was only rectified in 2006. Before then there are no similar standard.
Only recently the microprocessor have become powerful enough to support such system. |
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| Q: What are the advantages of this Wireless Mesh Networking? |
No complicated communication wiring. This saves 40-60% in implementation cost.
Reduce commissioning time.
Quick Implementation as only AC wiring is required
No messy site
Reduce Lightning Damages. As there are no communication wiring, lightning surges are significantly reduced.
Easy maintenance. No wiring to troubleshoot. Just change controller.
Easy Expandability. Just add new door. No wiring |
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| Q: What if one of the controller is down. Is there any effect on the other controllers? |
If there are many controllers, multiple data paths are automatically establish. If one controller is down, the data will automatically choose another path. More controllers will increase the reliability of the whole network.
For worst case example, where the controllers are strung in a line, a controller failure will cause downstream controllers to loose connection. |
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| Q: What if there is a controller which is far away and there is no other controller nearby? |
| The Wireless PCI (wPCI) can be used as a node to extend the wireless reach. |
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| Q: What prevents a neighboring network from connecting to another network within range? |
Lattice controller have a built in unique customer code which only connects to controller with similar code.
There are also selectable wireless channel to prevent interconnection. |
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