Also referred to as ADSL, a type of internet connection with differing download and upload speeds. Typically, download speeds are faster, which suits most browsing and streaming needs. This connection type runs over the copper cable network, but is currently being phased out in favour of full fibre.

The maximum amount of data that can be transmitted over an internet connection in a given time, usually measured in megabits per second (Mbps). Higher bandwidth means more data can flow, which is crucial for businesses with multiple users. Read more on our Broadband connection speeds explained help page.

An internet connection reserved exclusively for one user or organisation. Unlike shared connections, dedicated lines offer consistent speeds and reliability – ideal for high-demand business environments. Our dedicated line offering is called BTnet.

A naming system for computers, services, and other resources. It turns domain names into IP addresses, which browsers then use to load internet pages.

An IP address that changes periodically. It’s assigned by an internet service provider (ISP – that’s us) and is suitable for most general business activities that don’t require remote access or hosting. Read more on What is a dynamic IP address? 

A set of rules we impose to prevent excessive usage that could affect other users. Even "unlimited" plans may have restrictions under this policy. Read more on our help page Is there a fair usage policy for BTnet?

A high-speed internet connection that uses light signals through fibre optic cables. It offers faster and more reliable service compared to traditional copper lines. Our optical fibre internet service is called Optical Connect.

A broadband set-up where fibre optic cables run to a street cabinet, and the final connection to the premises uses copper wires. It’s faster than ADSL but slower than full fibre.

Also known as full fibre, this set-up uses fibre optic cables all the way to the business premises, offering the highest speeds and reliability. Check out our deals on full fibre.

A security system that monitors and controls incoming and outgoing network traffic. It helps protect business networks from unauthorised access and cyber threats. Find out more about our Managed Firewall service.

A global computer network providing a variety of information and communication facilities, consisting of interconnected networks using standardised communication protocols.

A network of physical devices connected to the internet, such as smart thermostats, security cameras, and industrial sensors. IoT can enhance automation and efficiency in business operations.

Every computer connected to the internet must have a unique address, known as an IP address. It’s a numeric address that serves as a unique identification for a computer and the network it belongs to.

A network that connects computers and devices within a limited area, such as an office. It allows for file sharing, communication, and centralised management. Find out more about our Local Area Networking service.

The delay before data begins to transfer after a request. Low latency is crucial for real-time applications like video conferencing and file sharing.

The UK’s communications regulator. Ofcom oversees broadband providers and ensures fair practices, competition, and consumer protection.

An internet connection where download and upload speeds are equal. This is beneficial for businesses that rely heavily on cloud services, video conferencing, and large file uploads.

A contract we provide that outlines the expected level of service, including uptime guarantees, response times, and compensation for outages.

An IP address that doesn’t change. It’s essential for businesses that host websites, run servers, or require secure remote access.

A secure connection that encrypts data between a user and the internet. VPNs are used to protect sensitive information and enable remote access to business networks. Find out more about our IP VPN solutions.

A technology that allows voice calls to be made over the internet instead of traditional phone lines. It’s cost-effective and scalable for businesses. Compare our VoIP systems.

A wireless networking technology that allows devices to connect to the internet without physical cables. It’s essential for flexible and mobile work environments.

A wide area network connects devices over a much larger area, potentially spanning cities, countries, or even the world. The internet is an example of a WAN.

Understanding business broadband can be tricky, so this glossary breaks down key terms to help you make informed decisions. It covers everything from connection types and internet infrastructure to security features and service agreements, making broadband easier to navigate for businesses.