190 CHAPTER 4: F LEXIBLE INTERFACE CARDSInterface Optical Fiberw WARNING: Laser danger: Invisible laser radiation may be emitted from thefiber-optic ports which are connected with lasers. To protect your eyes againstradiation harm, never stare into an open fiber-optic port.c CAUTION: The FIC-1ATM-OC3SML provides a long-haul fiber interface. It requirestransmission distance at least longer than 25 km (15.5 in.); otherwise, theinterface cannot receive signals.The FIC-1ATM-OC3MM must be connected using the multi-mode optical fiberwhereas the FIC-1ATM-OC3SM/ FIC-1ATM-OC3SML must be connected using thesingle-mode optical fiber.FIC-1G.SHDSLIntroduction FIC-1G.SHDSL, the 1-port single-pair high-speed digital subscriber line card, usestrellis coded pulse amplitude modulation (TCPAM) for coding and provides thesymmetric rates up to 2.3 Mbps. Its transmission speed can automatically adapt tocable length and conditions.Compared with ADSL, G.SHDSL allows longer transmission segment and as such,can serve a wider range of applications. It can substitute for E1/T1 lines to providehigh-speed data service access. However, as TCPAM uses the band starting from 0Hz for data transmission, G.SHDSL cannot share the same line with POTS or ISDNjust like what ADSL has done.The FIC-1G.SHDSL supports:■ Manual G.SHDSL line activation/deactivation and easy-to-use fault locationtools.■ G.992.1-compliant interface and auto-sensing.Interface Attributes The following table describes the interface attributes of the FIC-1G.SHDSL.ACT OFF means no data is beingtransmitted or received on theinterface and blinking means data isbeing transmitted and/or received.Table 134 LEDs on the ATM card panelsLED DescriptionTable 135 Interface attributes of the FIC-1G.SHDSLAttribute FIC-1G.SHDSLConnector RJ-11Number of connectors 1Interface standard G.991.2
