What is Dialup? What is Fibre Optic? What is Isdn? What is Adsl?

By: Dean Barnard

What is Dialup?

Dialup is the slow and annoying connection speed some of us had to experience, and some of us still do. Dialup is when a modem is used to connect to the wall socket via a cable using a 66-45 cable to connect to the internet. You require an internal modem for this connection or an external modem, most PC's still come with internal modems and some business's still use dialup connections for when users go home and use VPN to connect to the company's servers.

What is Fibre Optic?

This has also been known as the speed of light, up to the gigabytes. This Fibre Optic cable has a bundle of glass threads, which have the ability of sending messages modulated onto light wave. Fibre Optic cables have a much greater bandwidth than metal cables. They have less interference, are much thinner and lighter than metal wires. The data is transmitted digitally not analogically. Fibre optic is very expensive to install as well as being fragile.

What is ISDN?

Meaning Integrated Services Digital Network, a standard to send video, voice and data over a digital telephone line. IDSN connection speeds are from 64Kbps. There are two types of ISDN, these are : 'basic rate interface' and 'primary rate interface'. Basic Rate: Has two B channels consisting of 6Kbps and one D channel for transmitting. Primary Rate: Has 23 B channels and a single D channel.

What is ADSL?

Meaning Asymmetric Digital Subscriber Line, this is the most common type of Internet world wide in today's society. This allows more data to be sent across existing copper telephone lines. ADSL requires a specific modem and now has the capability of wireless as well as Ethernet. ADSL connections are from 1.5Mbps to 9 Mbps when receiving data. When sending data it can connection up to 16Kpbs to 640kbs

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Dean Barnard

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