Lancom 1723 VOIP User Manual

Also see for 1722 VOIP: Manuals User manual

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Lancom 1723 VOIP User Manual Manual pdf 12 page image

LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP Chapter 1: Introduction11EN1 IntroductionLANCOM VoIP Routers are fully functional routers with an integrated firewallto provide local networks with secure access to the Internet.With the VPN option included, these devices work as powerful Dynamic VPNgateways for external locations or mobile users.Along with the ADSL connection, these devices also feature ISDN connections,and some feature analog telephone connections. An ISDN line can be used tobackup the WAN connection, for remote management of the router, as a basisfor office communications via LANCAPI, and for establishing Dynamic VPNconnections to external locations that use dynamic IP addresses.By using the Voice over IP function, these devices can transfer voice data overbroadband Internet as well as over ISDN and analog telephone connections.LANCOM 1823VoIP only  LANCOM Wireless Routers and LANCOM Access Points can be oper-ated either as self-sufficient access points with their own configura-tion (WLAN modules in "Access Point mode") or as components in aWLAN infrastructure, which is controlled from a central WLAN Con-troller ("managed mode"). Please observe the corresponding noticesin this documentation.LANCOM VoIP routers can be upgraded with powerful controls over Internetaccess with the LANCOM Content Filter Option. This intelligent high-end solu-tion uses a database-supported web filtering technology that works with pro-files to control access rights and that also offers practical functions such asoverrides. A system requirement for operating the content filter is LCOS 8.0,the operating system available for free download from LANCOM.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 near-est telephone exchange. From here, the data is passed directly on to the Inter-net 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.