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LXT301ZNE Datasheet

  • LXT301ZNE

  • PCM TRANSCEIVER|SINGLE|CEPT PCM-30/E-1|CMOS|DIP|28PIN|PLASTI...

  • 30頁

  • ETC

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LXT300Z/LXT301Z
Advanced T1/E1 Short-Haul Transceivers
Datasheet
The LXT300Z and LXT301Z are fully integrated transceivers for both North American 1.544
Mbps (T1) and International 2.048 Mbps (E1) applications. They are pin and functionally
compatible with standard LXT300/301 devices, with some circuit enhancements.
The LXT300Z provides receive jitter attenuation starting at 3 Hz, and is microprocessor
controllable through a serial interface. The LXT301Z is pin compatible, but does not provide
jitter attenuation or a serial interface. An advanced transmit driver architecture provides constant
low output impedance for both marks and spaces, for improved Bit Error Rate performance over
various cable network configurations. Both transceivers offer a variety of diagnostic features
including transmit and receive monitoring. Clock inputs may be derived from an on-chip crystal
oscillator or from digital inputs. They use an advanced double-poly, double-metal CMOS
process and require only a single 5-volt power supply.
Applications
s
s
s
s
PCM/Voice Channel Banks
Data Channel Bank/Concentrator
T1/E1 multiplexers
Digital Access and Cross-connect Systems
(DACS)
s
s
s
s
Computer to PBX interfaces (CPI & DMI)
High-speed data transmission lines
Interfacing Customer Premises Equipment
to a CSU
Digital Loop Carrier (DLC) terminals
Product Features
s
s
s
s
s
s
Data recovery and clock recovery functions
Receive jitter attenuation starting at 3 Hz
exceeds AT&T Pub 62411, Pub 43801, Pub
43802, ITU G.703, and ITU G.823
(LXT300Z only)
Line driver with constant low mark and
space impedance (3
鈩?/div>
typical)
Minimum receive signal of 500 mV
Adaptive and selectable (E1/DSX-1) slicer
levels for improved SNR
Programmable transmit equalizer shapes
pulses to meet DSX-1 pulse template from
0 to 655 feet or drive 120
鈩?/div>
twisted pair or
75
鈩?/div>
coax cable for E1
s
s
s
s
s
s
s
Local and remote loopback functions
Digital Transmit Driver Monitor
Digital Receive Monitor with Loss of
Signal (LOS) output and first mark reset
Receiver jitter tolerance 0.4 UI from 40
kHz to 100 kHz
Microprocessor controllable (LXT300Z
only)
Compatible with most popular PCM
framers
Available in 28-pin DIP or PLCC
As of January 15, 2001, this document replaces the Level One document
LXT300Z/LXT301Z 鈥?Advanced T1/E1 Short-Haul Transceivers.
Order Number: 249066-001
January 2001

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