FTTC (Fibre to the Cabinet) is a broadband technology that provides high-speed internet by combining fibre-optic cables with existing copper telephone lines. Here’s a detailed look at how it works:
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Fibre-Optic Cables: FTTC uses fibre-optic cables to connect the local telephone exchange to a street cabinet (also known as a distribution point or fibre cabinet). Fibre-optic cables transmit data using light signals, which allows for much faster and more reliable data transfer compared to copper lines.
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Street Cabinet: The street cabinet, located close to residential areas, is where fibre-optic cables meet existing copper telephone lines. Inside the cabinet is a DSLAM (Digital Subscriber Line Access Multiplexer) that plays a crucial role in FTTC. The DSLAM converts the high-speed data from the fibre-optic cables into signals that can be transmitted over the copper lines to individual homes and businesses.
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Copper Lines: From the street cabinet, FTTC uses existing copper telephone lines to connect to individual properties. This final segment, known as the "last mile," transmits the data from the cabinet to your home. Although copper lines are less efficient for data transmission compared to fibre-optic cables, the high-speed fibre connection up to the cabinet helps maintain good speeds.
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Modem/Router: To connect to FTTC, you need a VDSL2 (Very-high-bit-rate Digital Subscriber Line 2) modem or a router with built-in VDSL2 support. This device connects to the copper line coming from the street cabinet and converts the data into a format that your devices can use for internet access.
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Speed and Distance: The speed of an FTTC connection is influenced by the distance from your home to the street cabinet. While the fibre-optic connection ensures high speeds over longer distances to the cabinet, the copper line can impact speeds over the final stretch:
- <0.5 km from the cabinet: Speeds up to 80 Mbps downstream.
- 0.5-1 km from the cabinet: Speeds around 60-80 Mbps.
- 1-1.5 km from the cabinet: Speeds around 30-60 Mbps.
- >1.5 km from the cabinet: Speeds may fall below 30 Mbps.
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Openreach Infrastructure: Openreach manages the UK’s telephone network infrastructure, including both the fibre-optic and copper lines used for FTTC. They ensure that the fibre connections to the street cabinets and the copper lines to homes are well-maintained to provide reliable and high-speed broadband services.
In summary, FTTC combines fibre-optic cables and existing copper lines to deliver high-speed internet. The fibre connection provides fast data transmission to the street cabinet, where a DSLAM converts the data for transmission over the copper lines to your home. Speeds are generally high but can be affected by the distance from the cabinet.
