RFL Communications 21 Sub-MUX Manual do Utilizador descarregar pdf (Página 28)

Solutions for an evolving world.

Digital Channels

Leased Digital Data Service

Back in the 1950′s, 1960′s and 1970′s a leased line meant a hotline, dedicated old-

fashioned analogue telephone line, linking two sites.

However for the past few decades the phrase has come to mean a fixed bandwidth

dedicated symmetric digital connection between two sites.

So when people talk of a leased line, they almost always mean a digital leased line.

Usually, they mean a point-to-point Ethernet circuit.

Digital leased lines offer a number of benefits. Their connection speeds are fixed, so

your connection won’t slow down at peak times. They’re symmetric, so you’re more

likely to have adequate bandwidth for applications such as telephony, FTPing files, and

loading files from a server on another site (and saving them).

The costs of a digital leased line keep falling, as the UK telecoms networks are upgraded,

the increased network usage leads to economies of scale. Much of the network makes

use of fiber-optic cable. Upgrading it doesn’t usually require that new fibre be laid, just

that the equipment at the ends of the fibres be upgraded. It’s not just computers that

have been getting faster and cheaper. Networking equipment has to, and this has made

it possible to provide digital leased lines for ever smaller monthly fees.

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RFL Communications 21 Sub-MUX Manual do Utilizador Página 28