GENERAL DESCRIPTION
   The DS3141, DS3142, DS3143, and DS3144 (DS314x) devices include all necessary circuitry to frame and format up to four separate DS3 or E3 channels. Each framer in these devices is independently configurable to support M23 DS3, C-Bit Parity DS3, or G.751 E3. The framers interface to a variety of line interface units (LIUs), microprocessor buses, and other system components without glue logic. Each DS3/E3 framer has its own HDLC controller, FEAC controller, and BERT, as well as full support for error detection and generation, performance monitoring, and loopbacks.

FEATURES
◾ One/Two/Three/Four Independent DS3/E3
   Framers on a Single Die
◾ Framing and Formatting to M23 DS3, C-Bit Parity
   DS3, and G.751 E3
◾ LIU Interface can be Binary (NRZ) or Dual-Rail
   (POS/NEG)
◾ B3ZS/HDB3 Encoder and Decoder
◾ Generate and Detect DS3/E3 Alarms
◾ Integrated HDLC Controller for Each Channel
◾ Integrated FEAC Controller for Each Channel
◾ Integrated Bit Error-Rate Tester (BERT) for Each
   Channel
◾ Large Performance-Monitoring Counters
◾ Line, Diagnostic, and Payload Loopbacks
◾ Externally Controlled Transmit Overhead
   Insertion Port
◾ Support External Timing or Loop-Timing
◾ Framers can be Powered Down When Not Used
◾ 8-Bit Processor Port Supports Muxed or
   Nonmuxed Bus Operation (Intel or Motorola)
◾ 3.3V Supply with 5V Tolerant I/O
◾ 144-Pin, 13mm x 13mm CSBGA Package
◾ IEEE 1149.1 JTAG Support

APPLICATIONS
   SONET/SDH Muxes
   PDH Muxes
   Digital Cross-Connect Systems
   Access Concentrators
   ATM and Frame Relay Equipment
   Routers