LXT305A
Integrated T1/E1 Short-Haul Transceiver with Transmit JA
Datasheet
The LXT305A is a fully integrated transceiver for both North American 1.544 Mbps (T1) and
International 2.048 Mbps (E1) applications. Transmit pulse shapes (T1 or E1) are selectable for
various line lengths and cable types.
The LXT305A provides transmit jitter attenuation starting at 3 Hz, and is microprocessor
controllable through a serial interface. It is especially well suited for applications in which the
T1/E1 signals are demultiplexed from a higher rate service such as DS3 or SONET/SDH. This
demultiplexing results in a gapped clock which the LXT305A smooths out.
The LXT305A, an advanced double-poly, double-metal CMOS device, requires only a single
+5V power supply.
Applications
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SONET/SDH Equipment
M13 Multiplexers
Digital microwave Radio
PCM/Voice Channel Banks
Data Channel Bank/Concentrator
T1/E1 multiplexer
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Digital Access and Cross-connect Systems
(DACS)
Computer to PBX interface (CPI & DMI)
High-speed data transmission lines
Interfacing Customer Premises Equipment
to a CSU
Digital Loop Carrier (DLC) terminals
Product Features
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Low power consumption (400 mW
maximum)
Constant low output impedance transmitter,
regardless of data pattern (3 Ω typical)
High transmit and receive return loss
exceeds ETS 300166 and G.703
Compatible with most popular PCM
framers
Line driver, data recovery and clock
recovery functions
Minimum receive signal of 500 mV
Selectable slicer levels (T1/E1) improve
SNR
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Programmable transmit equalizer shapes
pulses to meet DSX-1 pulse template from
0 to 655 ft
Local and remote loopback functions
Transmit Driver Performance Monitor
(DPM) output
Receive monitor with analog/digital Loss
of Signal (LOS) output per G.775
Receiver jitter tolerance 0.4 UI from 40
kHz to 100 kHz
Transmit jitter attenuation starting at 3 Hz
Meets CTR 12/13
Serial control interface
Available in 28-pin DIP and PLCC
As of January 15, 2001, this document replaces the Level One document
LXT305A — Integrated T1/E1 Short-Haul Transceiver with Transmit JA.
Order Number: 249068-001
January 2001
