XRT83SL28

www.DataSheet4U.com xr APRIL 2005 XRT83SL28 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT REV. 1.0.0 GENERAL DESCRIPTION The XRT83SL28 is a fully integrated 8-channel E1 short-haul LIU which optimizes system cost and performance by offering key design features. The XRT83SL28 operates from a single 3.3V power supply. The LIU features are programmed through a standard serial microprocessor interface or hardware control. EXAR’s LIU has patented high impedance circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power failure or when the LIU is powered off. Key design features within the LIU optimize 1:1 or 1+1 redundancy and non-intrusive monitoring applications to ensure reliability without using relays. Additional features include TAOS for transmit and receive, RLOS, LCV, AIS, DMO, and diagnostic loopback modes. APPLICATIONS ISDN Primary Rate Interface CSU/DSU E1 Interface E1 LAN/WAN Routers Public Switching Systems and PBX Interfaces E1 Multiplexer and Channel Banks Integrated Multi-Service Access Platforms (IMAPs) Integrated Access Devices (IADs) Inverse Multiplexing for ATM (IMA) Wireless Base Stations FIGURE 1. HOST MODE BLOCK DIAGRAM OF THE XRT83SL28 1 of 8 Channels Driver Monitor DMO TCLK TPOS TNEG HDB3 Encoder Timing Control Tx Pulse Shaper Line Driver TTIP TRING Analog Loopback Remote Loopback Jitter Attenuator (Rx or Tx) Digital Loopback RCLK RPOS RNEG/LCV HDB3 Decoder Clock & Data R...