6.1 Flashcards
All wirelesss ignals are carried through the air by electromagnetic waves. The – – – – – – – – commonly called the airwaves is the frequency range of electromagnetic waves used for data and voice communication
Wireless spectrum
As defined by the FCC which controls it use, the wireless spectrum spans frequency ranges or – – – – between 9 kHz and 300 GHz
Bands
RF ID frequency range is from – – – – – –/ – – – – – – – – –. These are the lowest of several frequency ranges for rfid and approved for global use
125KHZ – 134.2 KHG
Near field communication fix frequency
13.56 MHZ
Z wave fixed frequency
90.842 MHZ
Cellular frequency range
824–8 96MHZ
An additional RF ID range 
858– 930MHz
Cellular frequency range
1850MHZ – 1990MHZ
Wi-Fi 802.11 BGNAX Frequency range for 2.4 GHz. As well as Zigby, Bluetooth,
2.4 GHz – 2.4835 GHz
ANT plus frequency range
2.4 57 GHz
Wi-Fi 802.11 ANACAX
5.1–5.8 GHz
This technology uses electromagnetic fields to store data or a small chip in an – – – – tag which includes an antenna that can bolt transmit and receive and possibly a battery
RFID
NRF ID tag holds between – – – – kilobytes of data such as serial number credit card information or medical data which you can transmit to a nearby reader
1–8
This technology is a form of RF ID and transfers data wirelessly over very short distances usually 10 cm or less
NFC
Some near field communication tags required no power but others are able to draw power through induction from items such as a
Cell phone
This technology is a smart home protocol that provides two basic types of functions one signaling to manage wireless connections and control to transmit data and commands between devices
Z wave
Add an item called a – – – – – – network controller call the hub receives commands from a smart phone or computer and relays the commands to various smart devices on the Netwerk
Z wave
Devices on the net worth of Z wave identified by a one bite
Node ID
What is a wave net worth the entire network has a 4 x 8 – – – –
Netwerk ID
Based on the 802.1 5.4 standard this technology is a low powered battery conserving wireless technology it is designed to handle small amounts of data and is therefore ideal to use an industrial scientific and medical centers
Zigbee
This technology defined by IEEE 802.1 5.1 specifications is named after medieval king of Denmark named Harold – – – – –
Bluetooth
———operates between 2.4 GHz and 2.4835 GHz with a band up to 1600 hops a second to help reduce interference
Bluetooth
This technology is based on the NT protocol which is an ad hoc wireless protocol operating at 2.4 GHz this is one of Wes acronym to learn as the term ANC simply refers to the insect with small in size tenacious worker
ANT plus
This technology has found a new life in the world of the Internet of things where is used primarily to collect data through various sensors it is also commonly used in remote control
IR infrared
Infrared requires a nearly unobstructed – – – between the transmitter and receiver while some devices use a Scanner mode that reflects I are signals of nearly or nearby services in order to circumvents some obstacles
Line of sight
A short bursts of data transmission on a particular frequency is in the band and the next Bruscos the next frequency in the sequence frequency hopping can happen hundreds of times a second – – – – is it cheaper to implement then DSSS and performs better than DSSS in crowded indoor environments
SHSS frequency hopping spread spectrum‘s
Data streams are divided and encoding into small chunks call chips which are spread over it all available free country is within one of 3Y channels, all at the same time. Processes of writing and encoding the data is called shipping and spreading ratio used to transform the data is called shipping code
Direct sequence spread spectrum
