19. Wireless Interference Flashcards

1
Q

What is BLE and what is its power and range?

A

Bluetooth Low Energy
20dBm transmit power
100 meter range

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2
Q

Bluetooth devices are grouped into 3 groups. What are the 3 classes power designation and range?

A
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
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3
Q

With Bluetooth, devices can be linked together with one acting as master and up to how slave devices? Also what is the cell called?

A

1 master and 7 slave devices in a PAN

piconets

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4
Q

BLE uses how many channels and in what band?

A

40 channels in the 2.4GHz

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5
Q

What band does ZigBee use and how many channels?

A

2.4GHz

16 channels 5MHz wide

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6
Q

What is ZigBee commonly used for and what IEEE number defines it?

A

Energy management and home and building automation applications
IEEE 802.15.4

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7
Q

ZigBee uses low power but can ramp up to what mW?

A

60mW

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8
Q

The Digital Enhanced Cordless Telecommunications (DECT) standard was developed by whom?

A

ETSI

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9
Q

What version of DECT is used in the US and what band does it operate on?

A

Version 6.0

1.9GHz

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10
Q

DECT phones shouldn’t cause interference in the 2.4GHz or 5GHz. Are there cordless phones that do operate in those bands?

A

Yes and their transmit power could easily overpower an AP.

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11
Q

What IEEE number defines the standard for Worldwide Interoperability for Microwave Access (WiMAX)?

A

IEEE 802.16

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12
Q

What are some types of devices that can cause interference?

A

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)

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13
Q

Can the AirMagnet Spectrum XT connect to Cisco SE?

A

No

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14
Q

How do access the Cisco Meraki RF Spectrum feature from the portal?

A

Wireless > RF Spectrum

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15
Q

What is the name of the chip set that lets Cicso CleanAir scan for interference?

A

Spectrum Analysis Engine (SAgE) chipset

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16
Q

By default, is Cisco CleanAir enabled or disabled?

A

Disabled

17
Q

In order to generate interference reports from an AP, what modes does it have to be set to?

A

Local and monitor

SE-Connect will not generate interference reports

18
Q

Interference severity is calculated by RSSI and duty cycle. What is the range of the severity index and which is high and which is low?

A

0 (low severity)

100 (high severity)

19
Q

What is the range of the air-quality index (AQI)?

A

0 (channel unusable)

100 (channel perfect)

20
Q

What are the 3 thresholds that ED-RRM (event-driven RRM) can be set to (include AQI)?

A

Low (AQI 35)
Medium (AQI 50)
High (AQI 60)

21
Q

What does a cluster ID designation look like?

A

It’s a pseudo-MAC address