2.7 Internet Connections Flashcards
What is the role of an ISP?
To establish high speed links between their network and clients
Define a legacy system
An old system that is still used in some critical functions
How does plain old telephone service (POTS) work?
Dial-up connection on public switched telephone network; analog connections can be voiced or data converted from binary
What is the maximum bandwidth of a dial-up modem?
53.3 kb/s
What is integrated services digital network (ISDN)?
An older technology designed to carry voice, video or data of B (bearer) channels; supports multiple 64 Kbps channels
What is asymmetric DSL?
Give the maximum speeds.
Different download/upload speeds (max 8Mbps download and 1.544Mbps upload)
What is very high bit-rate DSL (VDSL)?
High speeds of both download and upload (50Mbps+ download and 10Mbps+ upload)
What are the ADSL and VDSL max. distances to DSLAM?
ADSL - 18000ft
VDSL - 4000ft
What network does a cable modem use?
Cable TV, made up of of a hybrid fiber-coaxial distribution network
What are data-over-cable service interface specifications (DOCSIS)?
Specific frequency ranges used for upstream and downstream transmissions
List the three fiber connection types
Fiber to the curb, fiber to the premises and optical network terminal
What is an optical network terminal?
A physical device that converts optical signals into electrical signals
List five things cellular connections are used for?
SMS and text messaging, international roaming, conference calling, internet use and introduction to EDGE
What speeds can high speed packet access (HSPA) reach, and what is it sometimes referred to as?
14.4 Mbps, referred to as 3.5 G
What speeds can high speed packet access evolution (HSPA+) reach, and what is it sometimes referred to as?
50Mbps, referred to as 3.75G
Speed of 4G long-term evolution (LTE)?
100Mbps
Speed of LTE Advanced (LTE-A)
1 Gbps
What generation of cellular had a frequency of 1800 MHz and a speed of 14.4 to 64Kbps?
2G
Name the three types of microwave connections
Ultra, super, and extremely high frequency
Do antennas have to maintain a line of site for microwave waves to transmit?
Yes
Give the frequency and speed of 4G cellular
2-8 GHz, 100Mbps to 1Gbps
Which version of 5G operates at 2.5-3.7 GHz and 100-900 Mbps?
5G Mid-band
Give the frequency and speed of 1G cellular
30KHz, 2 Kbps
Which generation of cellular operates at 1.6-2 GHz and 144 Kbps to 2Mbps?
3G
Give the frequency and speed of 5G high-band cellular
25-39GHz, extremely high speed in Gbps
Which generation of cellular operates at 600-850 MHz and 30-250 Mbps?
5G low-band
Give the DOCSIS for upstream and downstream transmissions.
Upstream: 5MHz to 42MHz
Downstream: 50MHz to 860MHz
