The LXT381 is an octal short haul analog Line Interface Unit for ITU G.703 2.048 Mbit/sec.
transmission systems. It incorporates eight independent receivers and eight independent
transmitters in a single LQFP-144 or PBGA-160 package.
The transmit output drivers provide low impedance, constant during marks and spaces and
constant pulse amplitudes independent of supply voltage variations.
The LXT381 may be configured for unbalanced 75
Ω
or for balanced 120
Ω
systems without
external component changes in the transmit section. The transmit return loss performance
exceeds latest ETSI return loss recommendations such as ETS 300166.
The LXT381 features a differential data receiver architecture with high noise interference
margin. The receivers use peak detection and a variable threshold for reliable data recovery
down to 500 mV or up to 12 dB of cable attenuation.
Each receiver incorporates an analog Loss Of Signal (LOS) processor that meets latest ITU
G.775 standard.
The fast power down mode of all transmitters allows the implementation of Hitless Protection
Switching (HPS) application without the use of relays.
Applications
s
s
s
s
Synchronous Digital Hierarchy
(SDH) E1 tributary interfaces
Public switching trunk line interfaces
Digital Access Cross Connects (DACS)
Microwave transmission systems
Product Features
s
s
s
s
s
s
Octal E1 short haul line interface per ITU
G.703
Single rail supply voltage of 3.3V with 5V
I/O capability
Low power consumption of <100 mW per
channel (typ.)
75
Ω
/120
Ω
TX operation without
component changes
Transmit return loss complies with ETSI
ETS 300 166
Hitless Protection Switching (HPS)
s
s
s
s
s
s
s
Driver short circuit current limiter (<50 mA
RMS)
Differential receiver with 15dB of signal to
noise interference margin
Data recovery with no need for external
reference clock
Analog LOS detection per ITU G.775
Simple hardware control mode
JTAG Boundary Scan test port per IEEE
1149.4
Small footprint 144 pin LQFP or 160 pin
PBGA package
As of January 15, 2001, this document replaces the Level One document
known as
Octal E1 Line Interface.
Order Number: 249005-001
January 2001
Information in this document is provided in connection with Intel
®
products. No license, express or implied, by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of Sale for such products, Intel assumes no liability
whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to
fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not
intended for use in medical, life saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for
future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
The LXT381 may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current
characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature may be obtained by calling 1-800-
548-4725 or by visiting Intel’s website at http://www.intel.com.
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