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부품번호 | LXT332 기능 |
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기능 | Dual T1/E1 Line Interface Unit | ||
제조업체 | Intel | ||
로고 | |||
전체 30 페이지수
LXT332
Dual T1/E1 Line Interface Unit with Crystal-less Jitter Attenuation
Datasheet
The LXT332 is a fully integrated Dual Line Interface Unit (DLIU) for both 1.544 Mbps (T1) and
2.048 Mbps (E1) applications. It features B8ZS/HDB3 encoders and decoders, and a constant
low output impedance transmitter for high return loss. Transmit pulse shape is selectable for
various line lengths and cable types.
The LXT332 incorporates an advanced crystal-less digital jitter attenuator, switchable to either
the transmit or receive side. This eliminates the need for an external quartz crystal. It offers
both a serial interface (SIO) for microprocessor control and a hardware control mode for stand-
alone operation.
The LXT332 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 PCM/Voice Channel Banks
s Data Channel Bank/Concentrator
s T1/E1 multiplexer
s Digital Access and Cross-connect Systems
(DACS)
s Computer to PBX interface (CPI & DMI)
s SONET/SDH Multiplexers
s Interfacing Customer Premises Equipment
to a CSU
s Digital Loop Carrier (DLC) terminals
Product Features
s Digital (crystal-less) jitter attenuation,
selectable for receive or transmit path, or
may be disabled
s High transmit and receive return loss
s Constant low output impedance transmitter
with programmable equalizer shapes pulses
to meet DSX-1 pulse template from 0 to
655 ft.
s Meets or exceeds industry specifications
including ITU G.703, ANSI T1.403, AT&T
Pub 62411 and ITU-T G.742
s Compatible with most industry standard
framers
s Complete line driver, data recovery and
clock recovery functions
s Minimum receive signal of 500 mV, with
selectable slicer levels to improve SNR
s Local, remote, and dual loopback functions
s Built-In Self Test with QRSS Pattern
Generator
s Transmit/Receive performance monitors
with Driver Fail Monitor (DFM) and Loss
of Signal (LOS) outputs
s Receiver jitter tolerance 0.4 UI from 40
kHz to 100 kHz
s Available in 44-pin PLCC and 44-pin QFP
packages
As of January 15, 2001, this document replaces the Level One document
LXT332 — Dual T1/E1 Line Interface Unit with Crystal-less Jitter Attenuation.
Order Number: 249075-001
January 2001
LXT332 — Dual T1/E1 Line Interface Unit with Crystal-less Jitter Attenuation
5.0 Test Specifications.................................................................................................. 34
6.0 Mechanical Specifications ................................................................................... 41
Figures
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LXT332 Block Diagram ......................................................................................... 5
LXT332 Pin Assignments and Package Markings (PLCC) ................................... 8
LXT332 Pin Assignments and Package Markings (QFP Package) ...................... 9
50% AMI Coding ................................................................................................. 17
LXT332 SIO Write Operation .............................................................................. 22
LXT332 SIO Read Operation .............................................................................. 22
LX332 Interrupt Handling .................................................................................... 23
TAOS Data Path ................................................................................................. 25
TAOS with LLOOP & Selectable JA.................................................................... 25
Local Loopback - Selectable JA.......................................................................... 26
Remote Loopback - Selectable JA...................................................................... 27
Dual Loopback .................................................................................................... 27
QRSS BIST ......................................................................................................... 28
Typical LXT332 T1 Application (Host Control Mode, Bipolar I/O) ....................... 31
Line Interface for E1 Coax Applications .............................................................. 32
Typical LXT332 E1 120 W Application (Hardware Control Mode) ...................... 33
LXT332 Serial Data Input Timing Diagram ......................................................... 36
LXT332 Serial Data Output Timing Diagram....................................................... 37
LXT332 Receive Clock Timing............................................................................ 37
LXT332 Transmit Clock Timing........................................................................... 37
Typical Receiver Input Jitter Tolerance (Loop Mode) ......................................... 39
Typical Jitter Transfer Performance .................................................................... 40
LXT332 PLCC Package Specifications............................................................... 41
LXT332 QFP Package Specifications ................................................................. 42
Tables
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4
5
6
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12
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16
17
Host Mode and Bipolar Host Mode Pin Descriptions .......................................... 10
Unipolar Host Mode Pin Descriptions1 ............................................................... 12
Hardware Mode and Bipolar Hardware Mode Pin Descriptions1........................ 13
Unipolar Hardware Mode Pin Descriptions1 ....................................................... 15
Equalizer Control Inputs...................................................................................... 18
CLKE Settings..................................................................................................... 20
SIO Input Bit Settings (See Figure 5) .................................................................. 21
LXT332 Serial Data Output Bit Coding (See Figure 6) ....................................... 21
Recommended Transformer Values ................................................................... 30
Transformer Combinations.................................................................................. 30
Absolute Maximum Ratings ................................................................................ 34
Recommended Operating Conditions ................................................................. 34
Electrical Characteristics (Over Recommended Operating Conditions) ............. 34
Analog Specifications (Over Recommended Operating Conditions) .................. 35
LXT332 Serial I/O Timing Characteristics (See Figure 17 and Figure 18) .......... 36
LXT332 Receive Timing Characteristics (See Figure 19) ................................... 38
LXT332 Master Clock and Transmit Timing Characteristics (See Figure 20) ..... 38
4 Datasheet
4페이지 Dual T1/E1 Line Interface Unit with Crystal-less Jitter Attenuation — LXT332
1.2.2
1.2.3
1.2.4
Bipolar Violation Insertion
The same pins which provide the high frequency clocks can also be used to insert bipolar violations
into the outgoing data stream. Violations can be inserted into each LIU port independently.
Built-In Self Test (QRSS)
The LXT332 can generate and transmit a Quasi Random Signal Source (QRSS) pattern to Built-In
Self Test (BIST) applications. Logic errors and bipolar violations can be inserted into the QRSS
output. The LXT332 also detects QRSS pattern synchronization and reports bit errors in the
received QRSS pattern data stream.
AIS Detection
The LXT332 detects the AIS alarm signal on the receive side independent of the loopback modes.
When AIS is detected (less than 3 zeros in 2048 bits), the LXT332 provides an indicator output.
Datasheet
7
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부품번호 | 상세설명 및 기능 | 제조사 |
LXT331 | Dual T1/E1 Line Interface Unit | Level One |
LXT332 | Dual T1/E1 Line Interface Unit | Intel |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |