GENERAL DESCRIPTION

The DS32506 (6 port), DS32508 (8 port), and DS32512 (12 port) line interface units (LIUs) are highly integrated, low-power, feature-rich LIUs for DS3, E3, and STS-1 applications. Each LIU port in these devices has independent receive and transmit paths, a jitter attenuator, full-featured pattern generator and detector, performance-monitoring counters, and a complete set of loopbacks. An on-chip clock adapter generates all line-rate clocks from a single input clock.

FEATURES

■ Pin-Compatible Family of Products

■ Each Port Independently Configurable

■ Receive Clock and Data Recovery for Up to 457 meters (1500 feet) of 75Ω Coaxial Cable

■ Standards-Compliant Transmit Waveshaping

■ Uses 1:1 Transformers on Both Tx and Rx

■ Three Control Interface Options: 8/16-Bit Parallel, SPI, and Hardware Mode

■ Jitter Attenuators (One Per Port) Can be Placed in the Receive Path or the Transmit Path

■ Jitter Attenuators Have Provisionable Buffer Depth: 16, 32, 64, or 128 Bits

■ Built-In Clock Adapter Generates All Line-Rate Clocks from a Single Input Clock (DS3, E3, STS-1, 12.8MHz, 19.44MHz, 38.88MHz, 77.76MHz)

■ Per-Port Programmable Internal Line Termination Requiring Only External Transformers

■ High-Impedance Tx and Rx, Even When VDD = 0, Enables Hot-Swappable, 1:1 and 1+1 Board Redundancy Without Relays

■ Per-Port BERT for PRBS and Repetitive Pattern Generation and Detection

■ Tx and Rx Open and Short Detection Circuitry

■ Transmit Driver Monitor Circuitry

■ Receive Loss-of-Signal (LOS) Monitoring Compliant with ANSI T1.231 and ITU G.775

■ Automatic Data Squelching on Receive LOS

■ Large Line Code Performance-Monitoring Counters for Accumulation Intervals Up to 1s

■ Local and Remote Loopbacks

■ Transmit Common Clock Option

■ Power-Down Capability for Unused Ports

■ Low-Power 1.8V/3.3V Operation (5V Tolerant I/O)

■ Industrial Temperature Range: -40°C to +85°C

■ Small Package: 23mm x 23mm, 484-Pin BGA

■ IEEE 1149.1 JTAG Support

APPLICATIONS

    SONET/SDH and PDH Multiplexers

    ATM and Frame Relay Equipment

    WAN Routers and Switches

    Digital CrossConnects

    Access Concentrators

    CSUs/DSUs

    PBXs

    DSLAMs