Documentos de referencia sobre banda ancha

The development of broadband access platforms in europe technologies, services, markets. Executive Summary. August 2001

BDRC. Ltd by EUROPEAN COMMISSION

1. INTRODUCTION

There are different technologies capable of providing digital access to and from the home or SME. These are summarised as follows:

ISDN Integrated Services Digital Network (ISDN) used over copper, 'twisted pair,' lines as found in the local loop. Typically Basic Rate Interface (BRI) or ISDN2.

Leased Typically Primary Rate Interface (PRI) or ISDN30 used over high performance, coaxial, copper cable which is leased as a dedicated connection for exclusive use.

DSL Digital Subscriber Line (DSL) used over copper, 'twisted pair,' lines as found in the local loop. Typically ADSL (Asymmetric DSL).

DTT Digital Terrestrial Transmission (DTT) typically used to broadcast Digital Television (DTV). Digitised channels are transmitted over the legacy analogue infrastructure.

Digital Wireless, radio transmission, most typically used to broadcast DTV, when it is referred to as Direct To Home (DTH). When upgraded from analogue, it is known as digital broadcast satellite (DBS).

Digital Independent networks used to supply DTV, telephony and Internet. Recent infrastructure uses fibre optic core with copper outer layer (known as hybrid cable). Legacy infrastructure uses coaxial, copper cable with two-way, dig...

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