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Governments botching the technology issues : Comments
By Nick Beaumont, published 12/6/2007Building a national optical fibre network would have social and economic benefits for Australia.
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How does FTTH work?
The Internet "backbone" is made up of fiber optic cables (very thin glass filaments) that have enormous bandwidth and use light pulses to carry information. Most customers, however, connect to the backbone through copper-based technologies like twisted pair and DSL or Hybrid Fiber Coax cable, which have limited bandwidth and limited capacity to carry integrated voice, video, and data services. This creates a speed and service bottleneck in the "last mile," the distance between the fiber optic backbone and customers.
Some providers are beginning to deliver integrated services over fiber optic cables that go from the Internet backbone directly to customers' homes or businesses. These cables may be buried, strung overhead or run through existing structures like sewer lines.
Providers primarily offer FTTH through two types of architectures, point-to-point and passive optical network (PON). Point-to-point requires providers to install an optical transceiver in the provider's central office for each customer. PON uses a single transceiver with a splitter to serve up to 32 businesses and residential customers who share the bandwidth. The splitter is located up to 30,000 feet from the central office, and a single strand of fiber can carry the signal another 3000 feet to the customer. Once the fiber reaches the customer's home or business, an optical electrical converter (OEC) on the side of the building converts the optical signal to an electrical signal that can interface with existing copper wiring. The current standard for PON is the Asynchronous Transfer Mode (ATM)-based ITU-T G.983.
Some providers are also using Gigabit Ethernet over fiber to provide customers with broadband access.
How fast is FTTH?
Fiber optic cables can currently carry information at speeds greater than 2.5 gigabits per second. Residential/business FTTH typically offers speeds from 10 mbps to over 100 mbps, which is a hundred times faster than most cable or DSL service and over twice as fast as a T3 connection.