Introduction

The FALC?56 framer and line interface component is designed to fulfill all required interfacing between analog E1/T1/J1 lines and the digital PCM system highway, H.100/H.110 or H-MVIP bus for world market telecommunication systems.

特性 Features

Line Interface

? High-density, generic interface for all E1/T1/J1 applications

? Analog receive and transmit circuits for long-haul and short-haul applications

? E1 or T1/J1 mode selectable

? Data and clock recovery using an integrated digital phase-locked loop

? Maximum line attenuation up to -43 dB at 1024 kHz (E1) and up to -36 dB at 772 kHz (T1/J1)

? Programmable receive equalizer characteristic

? Software-selectable receive line termination

? Programmable transmit pulse shapes for E1 and T1/J1 pulse masks

? Programmable line build-out for CSU signals according to ANSI T1. 403 and FCC68: 0dB, -7.5 dB, -15 dB, -22.5 dB (T1/J1)

? Low transmitter output impedances for high transmit return loss

? Tristate function of the analog transmit line outputs

? Analog switch for redundancy applications

? Transmit line monitor protecting the device from damage

? Receive line monitor mode

? Jitter specifications of ITU-T I.431, G.703, G.736 (E1), G.823 (E1) and AT&T TR62411 (T1/J1) are met

? Crystal-less wander and jitter attenuation/compensation

? Common master clock reference for E1 and T1/J1 (any frequency within 1.02 and 20 MHz)

? Power-down function

? Support of automatic protection switching

? Dual-rail or single-rail digital inputs and outputs

? Unipolar NRZ or CMI for interfacing fiber-optical transmission routes

? Selectable line codes (E1: HDB3, AMI/T1: B8ZS, AMI with ZCS)

? Loss-of-signal indication with programmable thresholds according to ITU-T G.775, ETS300233 (E1) and ANSI T1.403 (T1/J1)

? Optional data stream muting upon LOS detection

? Programmable receive slicer threshold

? Clock generator for jitter-free system/transmit clocks per channel

? Local loop and remote loop for diagnostic purposes

? Low power device

? Single power supply (3.3 V) or dual power supply (3.3 V and 1.8 V)

(Continue ...)