Lancom 1811 User Manual

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Lancom 1811 User Manual Manual pdf 10 page image

LANCOM 1811 Wireless DSL – LANCOM 1821+ Wireless ADSL Chapter 1: Introduction10EN1 IntroductionThe models of the LANCOM Router series offer each a DSL or ADSL connectorand also an ISDN connector. The ISDN line can be used as back-up for the DSLconnection, for remote management of the router or as basis for the officecommunication via LANCAPI.In addition to their function as routers between LAN and the Internet, allmodels of the LANCOM Router series operate also as base stations for wirelessnetworks. With the base station you link wireless PCs and notebooks to a net-work, connect these devices to the existing wired LAN and enable also thewireless devices to access the Internet.1.1 How do ADSL and ADSL 2+ work?ADSL (Asymmetric Digital Subscriber Line) is currently the most common tech-nology for broadband Internet connections. Standard and almost ubiquitoustelephone lines (analog or DSL) are the basis for DSL data transfer to the nea-rest telephone exchange. From here, the data is passed directly on to theInternet over high-speed connections.The asymmetric DSL variant ADSL was developed for applications where usersreceive large amounts of data but transmit only small amounts, such as whensurfing in the WWW. ADSL subscribers can receive data at up to 8 Mbps("downstream") and transmit at up to 800 kbps ("upstream"). ADSL providersare able to reduce these maximum rates as they please.To satisfy the strongly increasing demand for higher bandwidths, the stan-dards ADSL 2 and ADSL 2+ provider higher data rates as a basis for applica-tions such as video streaming or high-definition TV (HDTV) over the Internet.Depending on the Internet provider, ADSL 2 devices support downstream datarates of up to 12 Mbps, and ADSL 2+ devices support up to 24 Mbps. Hands-Internet splitterLANCOM Routertelephonephone lineDSL modemWLAN LAN