Term
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Definition
- Internet Service Provider
- responsible for large Internet networks |
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Term
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Definition
- also called tier 1 ISPs
- connect together and exchange data at NAPs |
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Definition
-network access point
- about 12 in US right now
- provide services to national and regional ISPs |
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Term
| basic internet architecture |
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Definition
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Term
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Definition
-metropolitan area exchange
-smaller versions of NAPs
-link regional ISPs
-about 50 in US today |
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Definition
| ISPs at the same level do not charge each other for transferring message they exchange across a NAP or MAE |
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Definition
| Each ISP is responsible for running its own interiour routing protocols and for exchanging routing information via the BGP exterior routing protocol at NAPs and MAEs and any other connection points between individual ISPs |
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Term
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Definition
| charge customers to connect to their part of the internet |
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Term
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Definition
- point of presence
- each ISP has at least one
- place where ISP provides services to its customers |
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Definition
- remote access server
- checks the user ID and password to make sure the caller is a valid customer |
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Term
| how does a customer connect to internet? |
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Definition
| - establish a circuit from location into the ISP POP using a DSL modem, cable modem, or dial-up modem over a telephone line |
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Term
| what does a customer pay for? |
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Definition
| Internet access and circuit connection |
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Term
| what is inside an ISP POP? |
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Definition
ATM - asynchronous transfer mode
CSU - channel service unit
DSU - data service unit
MAE - metropolitan area exchange
NAP - network access point |
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Term
| What SONET do U.S. national ISPs operate at? |
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Definition
OC-48 and OC-192
experimenting with OC-768
planning stages on OC-3072 |
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Term
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Definition
| 80 trillion bits per second (tbps) |
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Term
| What happens as traffic increases? |
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Definition
-more ISPs are added
-faster circuits
-bottlenecks occur |
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Term
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Definition
-DSL and cable modem
-provide higher speed communications
-broadband means 'analog transmission' |
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Term
| what is the internet used for? |
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Definition
| to connect one location to an ISP |
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Term
| Principal internet technologies |
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Definition
DSL
cable modem
fixed wireless
mobile wireless |
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Term
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Definition
- digital subscriber line
- family of point-to-point technologies designed to provide high speed data transmission over traditional telephone lines |
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Term
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Definition
| the part of a communication circuit between the subscriber's equipment and the equipment in the local central office |
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Term
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Definition
uses existing local loop cable, but places different equipment on the customer premises and in the telephone company end office
-ATM, ISP, POP |
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Term
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Definition
-customer premises equipment
-the equipment that is installed at the customer location |
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Term
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Definition
-used to separate the traditional voice telephone transmission from the data transmission
-directs the telephone signals into the normal telephone system so if the DSL equipment fails, voice communications are unaffected |
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Term
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Definition
-also called a DSL router
-a modem and FDM multiplexer
-produces Ethernet 10Base-T packets so it can connect directly to a computer or router and hub and can serve the needs of a small network |
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Term
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Definition
main distribution facility
works like the line splitter |
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Term
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Definition
-DSL access multiplexer
-multiplexes the data streams and converts them into ATM data, which are distributed to the ISPs |
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Definition
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Term
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Definition
- asymmetrical DSL
- uses frequency division multiplexing to create three separate channels over the one local loop circuit
-data channels have different speeds |
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Term
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Definition
2- telephone circuit
2- high speed simplex data channel for downstream traffic
3- slower duplex data channel primarily used for upstream traffic |
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Term
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Definition
-depends on distance from CPE to end office
-short distance, high speed |
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Term
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Definition
T1 level of ADSL
-max length of local loop: 18,000 ft
-max. downstream rate: 1.5 mbps
-max. upstream rate: 384 kbps |
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Term
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Definition
-very high data rate digital subscriber line
- ADSL designed for use over short local loops
- uses same FDM as ADSL |
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Term
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Definition
| frequency division multiplexing |
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Definition
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Definition
| digital service offered by cable television companies |
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Definition
- data over cable service interface specifications
- most common protocol for cable modems
-not formal |
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Definition
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Definition
- similar to DSL (point to point)
- uses shared multipoint circuits
- users must compete with other users for available capacity
-ISP, POP |
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Term
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Definition
- optical electrical converter
- on a fiber node |
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Definition
also called a headend
upstream circuit and downstream circuit |
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Term
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Definition
cable modem termination system
converts data from DOCSIS to internet protocols |
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Term
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Definition
| combines internet traffic with TC video traffic |
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Term
| popular types of fixed wireless |
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Definition
| WiMax, wireless DSL, , satellite |
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Term
| what do fixed wireless connections require |
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Definition
-line of sight access between transmitters
-tall buildings and towers |
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Term
| types of fixed wireless access |
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Definition
| point to point, multipoint |
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Term
| fixed wireless architecture |
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Definition
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Term
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Definition
| enable users to access the internet from any location where there is mobile wireless service |
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Term
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Definition
- wireless application protocol
- provides a set of application and network protocols called AR to support tmobie wireless internet applications. |
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