GENERAL DESCRIPTION
The DS26334 is a 16-channel short/long-haul line interface unit (LIU) that supports E1/T1/J1 from a single 3.3V power supply. A single bill of material can support E1/T1/J1 that requires no external termination. Redundancy is supported through nonintrusive monitoring, optimal high-impedance modes and configurable 1:1 or 1+1 backup enhancements. An on-chip synthesizer generates the E1/T1/J1 clock rates by a single master clock input of various frequencies. Two clock output references are also offered. The device is offered in a 256-pin TE-CSBGA, the smallest package available for a 16-channel LIU.

FEATURES
■ 16 E1, T1, or J1 Short/Long-Haul Line Interface Units
■ Independent E1, T1 or J1 Selections
■ Fully Internal Impedance Match Requires No External Resistors
■ Software-Selectable Transmit and ReceiveSide Impedance Match
■ Crystal-Less Jitter Attenuator
■ Selectable Single-Rail and Dual-Rail Mode and AMI or HDB3/B8ZS Line Encoding and Decoding
■ Detection and Generation of AIS
■ Digital/Analog Loss of Signal Detection as per T1.231, G.775 and ETS 300 233
■ External Master Clock Can Be Multiple of 2.048MHz or 1.544MHz for T1/J1 or E1 Operation; This Clock Will Be Internally Adapted for T1 or E1 Usage
■ Receiver Signal Level Indicator from -2.5dB to -38dB in T1 Mode and -3dB to -43dB in E1 Mode in 2.5dB Increments
■ Two Built-In BERT Testers for Diagnostics
■ 8-Bit Parallel Interface Support for Intel or Motorola Mode or a 4-Wire Serial Interface
■ Transmit Short-Circuit Protection
■ G.772 Nonintrusive Monitoring
■ Receive Monitor Mode Handles Combinations of 14dB to 30dB of Resistive Attenuation Along with 12dB to 30dB of Cable Attenuation
■ Specification Compliance to the Latest T1 and E1 Standards—ANSI T1.102, AT&T Pub 62411, T1.231, T1.403, ITU-T G.703, G.742, G.775, G.823, ETS 300 166, and ETS 300 233
■ Single 3.3V Supply with 5V Tolerant I/O
■ JTAG Boundary Scan as Per IEEE 1149.1

APPLICATIONS
    T1 Digital Cross-Connects
    ATM and Frame Relay Equipment
    Wireless Base Stations
    ISDN Primary Rate Interface
    E1/T1/J1 Multiplexer and Channel Banks
    E1/T1/J1 LAN/WAN Routers