3Com Router 5000 and Router 6000 v2.41Module Guide Chapter 4 Flexible Interface Cards (Router 6000)4-454.14 Router 1/2-Port ADSL FIC4.14.1 IntroductionRouter 1/2-Port ADSL FIC, the 1-/2-port ADSL over PSTN interface card, allows a LANsubscriber to connect to the digital subscriber's loop access multiplexer (DSLAM) atthe central office over a regular analog subscriber line or telephone line. Thus, thesubscriber can access the ATM/IP backbone or the Internet to enjoy services such ashigh-speed data communication and video on demand (VoD).ADSL transmits data in the high frequency band above 26 kHz. Therefore, it canprovide services without interfering with the voice service being provided in the lowfrequency band (0 to 4 kHz) on the same line. It provides downlink rates in the range32 kbps to 8 Mbps and uplink rates in the range 32 kbps to 1 Mbps.The ADSL interface cards provide these functions:z Manual ADSL line activation and deactivation, supporting SAR loopback forconvenient fault isolation.z Interface standards of G. DMT, G. Lite, and T1.413, auto-sensing.z Trellis coding (except for G. Lite) on ADSL interfaces, enhancing stability of ADSLconnections.4.14.2 Interface AttributesThe following table describes the interface attributes of the Router 1/2-Port ADSL FIC.Table 4-29 Interface attributes of the Router 1/2-Port ADSL FICAttribute Router 1-Port ADSL FIC Router 2-Port ADSL FICConnector RJ-11Number of connectors 1 (Router 1-Port ADSL FIC)2 (Router 2-Port ADSL FIC)Interface standardITU-T 992.1 G.DMTITU-T 992.2 G.LiteANSI T1.413 Issue 2Interface rateIn ADSL full rate mode (ITU-T 992.1 G.DMT/ANSI T1.413):8160 kbps (downlink rate)896 kbps (uplink rate).Cable and the Max. transmissionsegmentIn full rate mode, 1.8 km (1.1 mi.) over the telephone cable( depending on the line quality).
