Cisco Systems OL-6426-02 Benutzerhandbuch

This appendix contains conceptual information that may be useful to Internet service providers or 
network administrators when they configure Cisco routers. To review some typical network scenarios, 
see 

 For information on additional details or configuration 

topics, see 

The following topics are included in this appendix:

ADSL is a technology that allows both data and voice to be transmitted over the same line. It is a 
packet-based network technology that allows high-speed transmission over twisted-pair copper wire on 
the local loop (“last mile”) between a network service provider (NSP) central office and the customer 
site, or on local loops created within either a building or a campus. 

The benefit of ADSL over a serial or dialup line is that it is always on and always connected, increasing 
bandwidth and lowering the costs compared with a dialup or leased line. ADSL technology is 
asymmetric in that it allows more bandwidth from an NSP central office to the customer site than from 
the customer site to the central office. This asymmetry, combined with always-on access (which 
eliminates call setup), makes ADSL ideal for Internet and intranet surfing, video on demand, and remote 
LAN access.