€h 18 - Wireless Flashcards
18–2 services and applications
Technological considerations of wireless =
Scalability
18–2 services and applications
Reliability of wireless =
Consistency of service
18–3 services and applications
Environmental considerations =
Materials, objects, local geography, atmosphere
18–4 wireless standards and technologies
PAN =
LAN =
MAN =
GAN =
* 33 ft
* small geographic area, within an office building
* 50mi
* satellite
18–5 wireless standards and technologies
802.15.4 =
ZigBee’s
18–6 wireless standard technologies
WiMax
30 miles per hour
18–7 emerging wireless technologies and related standards
MBWA=
(2)
* Mobile broadband wireless access
* IEEE 802.20*100mi
18–12 electromagnetic spectrum
Spectrum groups =
(2)
*Ultra high frequency (UHF)
*300 MHz to 3000 MHz
18–13 spectrum groups
Band 6 =
Band 8 =
Band 9 =
*Medium
*very high
*ultrahigh
18–17 modulation demodulation techniques used in wireless systems
Modulation technique =
Except, CDMA does not belong
18–20 pre-design and survey analysis
Heavy moisture =
Causes disruptions in RF
18–21 licensed wireless networks
6 GHz and 11 GHz =
Public Safety applications (share office, law office)
18–23 design considerations
Radomes =
Covers antennas
18–26
Antenna types =
Except, trapezoidal, does not belong
18–28 waveguide feeders
High-frequency coaxial =
Very highly losses
18–28 waveguide feeders
Waveguide joined =
Airtight flange fittings
18–28 waveguide feeders
Elliptical waveguide =
Long runs
18–29 pressurization equipment
Towers (wireless) =
5mi airport Antenna supporting structure > 200ft high
18–30 pigtails and jumpers
Antenna =
(2)
* 7/8 type N connector
* Connector weakest point
18–30 power supplies and voltage objectives
Two major types voltage injectors =
Coaxial & unused pair
18–31 cable management
Feed line support =
1-1/2 inch above the roof
18–33 DAS
DAS transmits =
Within buildings
18–33 DAS
DAS root =
Radio transceiver
18–34 DAS
DAS size =
Single antenna or multi-antenna
18–35 cable plant
Five types of DAS cable =
Except wireless or password hybrid
18–35 cable plant
Shielded twisted pairs =
Carries power for the units
18–36 components
Antenna =
Must be tuned to the same frequency band
18–36 components
Radiating cable technology allows =
Coaxial cable
18–40 components
Retransmitted DAS services =
Except, family radio service (FRS) does not belong
18–43 components
Passive =
Does not require external power input
18–43 topologies
Cabling topologies DAS within =
(2)
* Star
* Tapped-trunk
18–44 star topology
Start topology cabling for DAS =
(3)
* Balanced twisted-pair
* coaxial
* optical fiber cables
18–46 DAS
First-generation (1G) =
Analog cellular
18–47 multiplexing technique
Forms of multiplexing =
Except GDMA does not belong “grandma”
18–59 basic service set (BS)
AP =
“Stand alone” or cable
18–67
routers =
Home-office
