GENERAL DESCRIPTION
   The DS3171, DS3172, DS3173, and DS3174 (DS317x) combine a DS3/E3 framer(s) and LIU(s) to interface to as many as four DS3/E3 physical copper lines.

FEATURES
◾ Single (DS3171), Dual (DS3172), Triple
   (DS3173), or Quad (DS3174) Single-Chip
   Transceiver for DS3 and E3
◾ All Four Devices are Pin Compatible for Ease of
   Port Density Migration in the Same Printed
   Circuit Board Platform
◾ Each Port Independently Configurable
◾ Performs Receive Clock/Data Recovery and
   Transmit Waveshaping for DS3 and E3
◾ Jitter Attenuator can be Placed Either in the
   Receive or Transmit Paths
◾ Interfaces to 75
Coaxial Cable at Lengths Up to
   380 meters, or 1246 feet (DS3) or 440 meters, or
   1443 feet (E3)
◾ Uses 1:2 Transformers on Both Tx and Rx
◾ On-Chip DS3 (M23 or C-Bit) and E3 (G.751 or
   G.832) Framer(s)
◾ Ports Independently Configurable for DS3, E3
◾ Built-In HDLC Controllers with 256-Byte FIFOs
   for the Insertion/Extraction of DS3 PMDL, G.751
   Sn Bit, and G.832 NR/GC Bytes
◾ On-Chip BERTs for PRBS and Repetitive Pattern
   Generation, Detection, and Analysis
◾ Large Performance-Monitoring Counters for
   Accumulation Intervals of at Least 1 Second
◾ Flexible Overhead Insertion/Extraction Ports for
   DS3, E3 Framers

APPLICATIONS
   Access Concentrators 
   Multiservice Access Platform (MSAP)
   SONET/SDH ADM and Muxes
   PBXs
   Multiservice Protocol Platform (MSPP)
   Digital Cross Connect
   Test Equipment
   PDH Multiplexer/Demultiplexer
   Routers and Switches 
   Integrated Access Device (IAD)