Overview
The TE3-LIU™ PEF 3452 Line Interface Unit is used to connect a DS3/STS-1 or E3 framer device to an analog transmission line. The line interface fulfills the relevant standards for DS3 (44.736 Mbit/s), STS-1 (51.840 Mbit/s) and E3 (34.368 Mbit/s) systems.
The TE3-LIU™ comes in a P-MQFP-44-2 package (SMD) to save a significant amount of board space. The integrated jitter attenuation further reduces overall system complexity and cost.

Features
• Generic analog interface for all DS3/STS-1/E3 applications
• Single chip solution for receive and transmit direction
• 3.3 V low power device
• Integrated receive equalization network
• Integrated noise and crosstalk filter
• Clock and data recovery using an integrated PLL with ultra-low intrinsic jitter
• Transmit clock duty cycle correction PLL
• No external components required for clock and data recovery and receive equalizer
• DSX receive line monitor (additional 20 dB gain according to ANSI T1.102)
• Low transmitter output impedances for high transmit return loss
• Disable function of the analog transmit line outputs
• Transmit pulse shaper to fulfill requirements of ANSI T1.404, Telcordia GR-499-CORE, ANSI T1.102 and ITU-T G.703 (E3)
• Maximum line length up to 1100 ft. (using standard coaxial cable, for example AT&T 728A, 734A or 734D)
• External line length selection (LBO) is not required
• Jitter specifications of GR-499-CORE and ITU-T G.823 are met
• Integrated jitter attenuation PLL and buffer in transmit direction
• Dual or single rail digital inputs and outputs from/to the framer interface
• Selectable line codes (HDB3 (E3), B3ZS (DS3/STS-1), AMI)
• Analog and digital loss of signal detection and indication
• Automatic RDOP/RDON blanking option in case of LOS
• Bipolar violation indication
• Local loop and remote loop for diagnostic purposes
• Insertion of alarm indication signal ("all ones")
• Flexible hardware or software controlled device configuration
• Device power down function
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