Learning Objectives

By the end of this chapter, you will be able to:

  • Describe the role of an Internet Service Provider (ISP).
  • Differentiate between wired and wireless internet connections.
  • Identify common types of broadband connections and the equipment they need.
  • Explain bandwidth, upload/download speed, and latency.
  • Choose a suitable connection for a home or business.

Connecting to the Internet

To connect to the internet, you need a connection from an Internet Service Provider (ISP). An ISP is a company that provides access to the internet. The connection from your home or business to the ISP is often called the “last mile.”

Key terms

  • Bandwidth / speed — how much data can be transferred per second, measured in Mbps (megabits per second). A 100 Mbps plan can, in theory, download a 100 MB file in about 8 seconds (100 MB × 8 bits = 800 megabits ÷ 100 Mbps).
  • Download vs upload speed — download is data coming to you (videos, web pages); upload is data you send (video calls, file uploads).
  • Latency — the delay before data starts arriving, measured in milliseconds; important for video calls and gaming.
  • Data cap — a limit on how much data you can use in a period, common on mobile plans.

There are two main categories of internet connections:

1. Wired Connections (Broadband)

Broadband refers to high-speed internet access. Common types of wired broadband connections include:

  • Dial-up: The oldest method, using a modem over a normal telephone line; very slow and now obsolete.
  • Cable: Uses the same coaxial cable network as cable television to provide internet access.
  • DSL (Digital Subscriber Line): Uses existing telephone lines to provide internet access. ADSL gives faster download than upload speed.
  • Fiber Optic: The fastest type of broadband, which uses light to transmit data through fiber optic cables. FTTH (Fiber to the Home) brings fiber all the way to the customer’s premises.
  • Leased line: A dedicated, private connection reserved for one organization, with guaranteed speed and equal upload and download. Used by banks, large offices, and data centers; more expensive.

2. Wireless Connections

  • Wi-Fi: Allows you to connect to the internet wirelessly within a limited area, using a router that is connected to a wired broadband service.
  • Cellular Data: Allows you to connect to the internet from a mobile device using your cellular provider’s network (e.g., 4G, 5G).
  • Satellite: Provides internet access via communication satellites, often used in rural or remote areas where wired broadband is not available.
  • Fixed wireless: Antennas on buildings receive signals from an ISP’s tower; useful where laying cable is difficult.

Equipment Needed

  • Modem — converts the ISP’s signal into data a computer can use (DSL or cable modem).
  • ONT/ONU — the fiber equivalent of a modem in FTTH connections.
  • Router — shares one internet connection among many devices and usually provides Wi-Fi.
  • Network cables and switches — connect wired devices in an office.
  • SIM card or mobile hotspot — for cellular connections.
flowchart LR
  ISP[ISP network] -->|Fiber cable| ONT[ONT/ONU]
  ONT --> R[Wi-Fi router]
  R --> L[Laptop]
  R --> P[Phone]
  R --> T[Smart TV]

Comparing Connection Types

Connection Medium Speed Reliability Typical use
Dial-up Telephone line Very slow Low Obsolete
DSL/ADSL Telephone line Moderate Moderate Homes where fiber is unavailable
Cable Coaxial cable Fast Good Homes
Fiber (FTTH) Optical fiber Very fast Very good Homes and offices
Leased line Dedicated fiber Guaranteed, fast Excellent (with SLA) Banks, large businesses
Cellular 4G/5G Radio (mobile towers) Fast, variable Varies by signal Mobile users, backup connection
Satellite Satellite link Moderate Weather-dependent; high latency Remote and rural areas

Nepal Context

  • FTTH fiber is now the most common home and office broadband in urban Nepal, offered by ISPs such as Nepal Telecom, WorldLink, and Vianet.
  • Mobile data (4G) from Nepal Telecom and Ncell is widely used, especially where fixed lines are unavailable.
  • The Nepal Telecommunications Authority (NTA) licenses ISPs and telecom operators.
  • Hilly and remote areas often depend on mobile data, microwave links, or satellite because laying fiber is costly.

Choosing a Connection for a Business

Consider:

  1. Speed needed — number of users, video calls, cloud software, and uploads.
  2. Reliability — banks and hospitals may need a leased line with a Service Level Agreement (SLA).
  3. Cost — monthly fee, installation charges, and equipment.
  4. Availability — whether fiber reaches the location.
  5. Backup — a second connection (such as 4G) keeps the business online if the main line fails.

Scenario: a travel agency in Thamel with 15 staff uses cloud booking systems and video calls with foreign clients. A fiber connection serves daily work, and a 4G router acts as automatic backup during fiber cuts, so bookings never stop.

Summary

Connecting to the internet requires a service from an ISP. This connection can be wired, using broadband technologies like DSL, cable, super-fast fiber optics, or dedicated leased lines, or it can be wireless, using Wi-Fi for local access and cellular, fixed wireless, or satellite for mobile or remote access. Equipment such as modems, ONTs, and routers link users to the ISP. Businesses choose connections based on speed, reliability, cost, availability, and the need for backup, and most users today use a combination of these technologies to stay connected.

Key Takeaways

  • An ISP provides access to the internet; the link to the customer is the “last mile.”
  • Bandwidth is measured in Mbps; latency is the delay before data arrives.
  • Wired broadband connections include DSL, cable, fiber (FTTH), and leased lines.
  • Wireless connections include Wi-Fi, cellular, fixed wireless, and satellite.
  • Fiber is the fastest common broadband; leased lines offer guaranteed, dedicated service.

Discussion Questions

  1. What type of internet connection do you have at home? What are its advantages and disadvantages?
  2. What is the difference between connecting to the internet via Wi-Fi and connecting via cellular data?
  3. Why is satellite internet often the only option for people in rural areas?

Exam-Style Questions

Short answer

  1. What is an ISP? Name two ISPs in Nepal.
  2. Differentiate between DSL and fiber-optic connections.
  3. What is a leased line? Why do banks use it?

Long answer

  1. Explain the different types of internet connections with their advantages and disadvantages.
  2. What factors should a business consider when choosing an internet connection? Illustrate with an example.