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LXT331PH Datasheet

  • LXT331PH

  • LINE INTERFACE|CMOS|LDCC|44PIN|PLASTIC

  • 32頁(yè)

  • ETC

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LXT331
Dual T1/E1 Line Interface Unit
Datasheet
The LXT331 is a Dual Line Interface Unit (DLIU) optimized for North America 1.544 Mbps
(T1) and international 2.048 Mbps (E1/CEPT) applications. It features a constant low output
impedance transmitter for high return loss. Transmit pulse shape is selectable for various line
lengths and cable types. The data recovery circuit also offers selectable slicer ratios for T1 or E1
applications.
The LXT331 offers both a serial interface (SIO) for microprocessor control and a hardware
control mode for stand-alone operation.
The LXT331 offers a variety of advanced diagnostic and performance monitoring features. It
uses an advanced double-poly, double-metal CMOS process and requires only a single 5-volt
power supply.
Applications
s
s
s
Digital Access and Cross-connect Systems
(DACS)
T1/E1 Multiplexer
SONET/SDH Multiplexers
s
s
s
Digital Loop Carrier (DLC) terminals
Cost efficient AFE for Digital Backend
ASICS
Analog LOS using PMRK/NMRK
Product Features
s
s
s
s
s
Complete line driver and data recovery
functions
Constant low output impedance transmitter
with a programmable equalizer that shapes
pulses to meet the DSX-1 pulse template
from 0 to 655 ft.
High transmit and receive return loss
Meets or exceeds industry specifications
including ITU G.703 and ANSI T1. 102-
1993
Compatible with industry standard framers
s
s
s
s
s
Minimum receive signal of 500 mV, with
selectable slicer levels (E1/DSX-1) to
improve SNR
Analog loopback function
Transmit performance monitors with
Driver Fail Monitor (DFM) output for
transmit driver short circuit detection
Transmit Driver Performance Monitor
(DPM) output on external pins MTIP and
MRING
Available in 44-pin PLCC and 44-pin QFP
packages
As of January 15, 2001, this document replaces the Level One document
LXT331 鈥?Dual T1/E1 Line Interface Unit.
Order Number: 249074-001
January 2001

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