Internet technologies ISDN, optical fibers, ADSL, Ethernet, modem, mobile 3G and

Question

Internet technologies
ISDN, optical fibers, ADSL, Ethernet, modem, mobile 3G and WiFi are different technologies used to
connect to the internet.

1. Try to arrange the above technologies in a chronological order!
2. Arrange them according to capacity!
3. Set the different technologies in an order according to range (the distance do they cover)!
4. Is it possible to arrange according to price?
5. Describe each technology as far as you know!
6. Search Wikipedia or Google to find out more!
7. What is the common term for a PC and a server in the context for computer communication?
8. What other types of units do we connect to the internet?
9. How can we classify links into two broad categories?
10. What is the unit for the capacity of a communication link?
11. What is the function of a router?
12. What is the difference between a router and a switch?
13. What utility program can you use to find out the route of communication in the internet?

Explanation / Answer

difference between router and switch

Routers might have a single WAN port and a single LAN port and are designed to connect an existing LAN hub or switch to a WAN. Ethernet switches and hubs can be connected to a router with multiple PC ports to expand a LAN

In telecommunications marketing, the term digital subscriber line is widely understood to mean Asymmetric Digital Subscriber Line (ADSL), the most commonly installed variety of DSL. The data throughput of consumer DSL services typically ranges from 256 kbit/s to 20 Mbit/s in the direction to the customer (downstream), depending on DSL technology, line conditions, and service-level implementation. In ADSL, the data throughput in the upstream direction, (i.e. in the direction to the service provider) is lower than that in the downstream direction (i.e. to the customer), hence the designation of asymmetric. With a symmetric digital subscriber line (SDSL), the downstream and upstream data rates are equal.

Wi-Fi is the name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections

Ethernet is a link layer protocol in the TCP/IP stack, describing how networked devices can format data for transmission to other network devices on the same network segment, and how to put that data out on the network connection.

Integrated Services Digital Network

Integrated Services Digital Network (ISDN) is a switched telephone service capable of transporting voice and digital data, is one of the oldest Internet access methods. ISDN has been used for voice, video conferencing, and broadband data applications. ISDN was very popular in Europe, but less common in North America. Its use peaked in the late 1990s before the availability of DSL and cable modem technologies.

Basic rate ISDN, known as ISDN-BRI, has two 64 kbit/s "bearer" or "B" channels. These channels can be used separately for voice or data calls or bonded together to provide a 128 kbit/s service. Multiple ISDN-BRI lines can be bonded together to provide data rates above 128 kbit/s. Primary rate ISDN, known as ISDN-PRI, has 23 bearer channels (64 kbit/s each) for a combined data rate of 1.5 Mbit/s (US standard). An ISDN E1 (European standard) line has 30 bearer channels and a combined data rate of 1.9 Mbit/s.

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