Wide Area Networks Flashcards
dedicated leased line
wan connection
logical connection that connects two sites through a isp
more expensive
customer does not have to share bandwidth
(CSU/DSU)
Channel Service Unit / Data Service Unit
used to
terminate the digital signals at customer’s demarcation point
circuit-switched connection
wan connection
connection is brought up only when needed
cost effective for customers that only need periodic connectivity
packet-switched connection
wan connection
always on like dedicated leased line
multiple customers will share the bandwidth
need sla to determine service quality
electric power lines
wan physical media
bpl: broadband over power lines
<2.7 Mbps
wan wireless media (cellular)
3g 4g 5g -3 bands -increased speed, lower coverage area -most use mid band
as g increases, speeds increases
gsm
global system for mobile communications
cellular tech that converts voice to digital data
uses sim cards
cdma
code division multiple access
cellular tech that uses code division to split up the channel
microwave
communication system that uses a beam of radio waves to transmit information
wimax
satellite: remote areas, expensive, flying or ships use
radio: frequency depends country
t1
dedicated leased line
1.544 mbps
t3
dedicated leased line
44.736 mbps
e1
dedicated leased line
2.048 mbps
metro ethernet
service providers offer ethernet interfaces to customers
less expensive and more common
tech is hidden from customers, they only need to connect to smart jack
dsl
digital subscriber line - old, transmit digital data over telephone lines
cable modem
hfc: hybrid fiber-coax
docsis: data over cable service interface specification
