19. Wireless Interference Flashcards
What is BLE and what is its power and range?
Bluetooth Low Energy
20dBm transmit power
100 meter range
Bluetooth devices are grouped into 3 groups. What are the 3 classes power designation and range?
Class 1 (industrial) - max 100 mW - 100 meter range Class 2 - max 2.5 mW - 10 meter range Class 3 - max 1 mW - 1 meter range
With Bluetooth, devices can be linked together with one acting as master and up to how slave devices? Also what is the cell called?
1 master and 7 slave devices in a PAN
piconets
BLE uses how many channels and in what band?
40 channels in the 2.4GHz
What band does ZigBee use and how many channels?
2.4GHz
16 channels 5MHz wide
What is ZigBee commonly used for and what IEEE number defines it?
Energy management and home and building automation applications
IEEE 802.15.4
ZigBee uses low power but can ramp up to what mW?
60mW
The Digital Enhanced Cordless Telecommunications (DECT) standard was developed by whom?
ETSI
What version of DECT is used in the US and what band does it operate on?
Version 6.0
1.9GHz
DECT phones shouldn’t cause interference in the 2.4GHz or 5GHz. Are there cordless phones that do operate in those bands?
Yes and their transmit power could easily overpower an AP.
What IEEE number defines the standard for Worldwide Interoperability for Microwave Access (WiMAX)?
IEEE 802.16
What are some types of devices that can cause interference?
Canopy—A fixed wireless broadband technology
Continuous transmitter
Jammer
SuperAG—A proprietary set of extensions developed by Atheros
Wireless video camera that use analog or non-802.11
Wi-Fi invalid channel
Wi-Fi inverted
Xbox controllers (2.4GHz)
Can the AirMagnet Spectrum XT connect to Cisco SE?
No
How do access the Cisco Meraki RF Spectrum feature from the portal?
Wireless > RF Spectrum
What is the name of the chip set that lets Cicso CleanAir scan for interference?
Spectrum Analysis Engine (SAgE) chipset