The DS3141/DS3142/DS3143/DS3144 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. Applications * Access Concentrators * ATM and Frame Relay Equipment * Digital Cross-Connects * PBXs * Routers/Switches * SONET/SDH and PDH Multiplexers * Test Equipment * 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 * Features continued on page 6 of the PDF data sheet