LXT318

E1 NTU/ISDN PRI Transceiver

Datasheet

The LXT318 is the first fully integrated transceiver for E1 Network Termination Unit (NTU) and
ISDN Primary Rate Interface (ISDN PRI) applications at 2.048 Mbps. The transceiver operates
from 0.0 km to 2.6 km of 0.6 mm (22

AWG

) twisted-pair cable with no external components.

The LXT318 offers selectable HDB3 encoding/decoding, and unipolar or bipolar data I/O. The
LXT318 also provides jitter attenuation in either the transmit or receive direction starting at 3
Hz, and incorporates a serial interface (SIO) for microprocessor control.

The LXT318 offers a variety of diagnostic features including loopbacks and loss of signal
monitoring. It is built using an advanced double-poly, double-metal CMOS process and requires
only a single 5-volt power supply.

Applications

Product Features

PCM 30/ISDN PRI Interface (ITU G.703,
I.431)

NTU (interface to E1 Service)

E1 Mux or LAN bridge - Campus
Networking

Wireless Base Stations/Networking

CPU to CPU Channel Extenders

Digital Loop Carrier -- Subscriber Carrier
Systems

Channel Banks

HDSL - E1 Extension

Fully integrated transceiver comprising:
on-chip equalizer; timing recovery/control;
data processor; receiver; transmitter and
digital control

Pin compatible with the LXT310 T1 CSU/
ISDN PRI (1.544 Mbps) transceiver

Meets or exceeds latest ITU specifications
including G.703, G.736, G.823, and I.431

Meets ETSI 300011 and 300233 standards

Jitter attenuation starting at 3 Hz,
switchable to transmit or receive path

Exceeds ETSI TBR12/13 jitter transfer
performance specifications

Fully restores the received signal after
transmission via a cable with attenuation of
43 dB @ 1024 kHz

Selectable Unipolar or Bipolar data I/O

Selectable HDB3 encoding/decoding

Output short circuit current limit protection

Meets 50 mA

RMS

short-circuit current

limit
(per OFTEL OTR-001)

On-line idle mode for testing or for
redundant systems

Local and remote loopback functions

Receive monitor with Loss of Signal (LOS)
output

Microprocessor controllable

Available in 28-pin DIP and PLCC

Extended Temperature Range (-40° C to
+85° C)

As of January 15, 2001, this document replaces the Level One document

Order Number: 249073-001

LXT318 -- E1 NTU/ISDN PRI Transceiver.

January 2001

Datasheet

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 LXT318 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.

*Third-party brands and names are the property of their respective owners.

Datasheet

E1 NTU/ISDN PRI Transceiver -- LXT318

Contents

1.0

Pin Assignments and Signal Descriptions

...................................................... 6

2.0

Functional Description

............................................................................................. 9

2.1

Transmitter ............................................................................................................ 9
2.1.1

Line Code ................................................................................................. 9

2.1.2

Idle Mode.................................................................................................. 9

2.1.3

Short Circuit Limit ................................................................................... 10

2.2

Receiver .............................................................................................................. 10
2.2.1

Jitter Attenuation .................................................................................... 10

2.3

Control Modes ..................................................................................................... 11

2.4

Host Mode Control .............................................................................................. 11
2.4.1

Serial Input Word.................................................................................... 12

2.4.2

Serial Output Word ................................................................................. 12

2.4.3

Hardware Mode Operation .....................................................................12

2.5

Initialization and Reset ........................................................................................ 12

2.6

Interrupt Handling................................................................................................ 15

2.7

Diagnostic Mode Operation................................................................................. 17
2.7.1

Transmit All Ones. ..................................................................................17

2.7.2

Local Loopback. ..................................................................................... 18

2.7.3

Remote Loopback. ................................................................................. 18

2.7.4

Network Loopback Detection. ................................................................ 19

3.0

Application Information

.........................................................................................20

3.1

LATN Decoder..................................................................................................... 20

3.2

Power Requirements........................................................................................... 21

3.3

Crystal Specifications .......................................................................................... 21
3.3.1

LXT318 Host Mode Applications ............................................................ 21

3.3.2

LXT318 Hardware Mode Applications.................................................... 22

4.0

Test Specifications

.................................................................................................. 25

5.0

Mechanical Specifications

.................................................................................... 33

LXT318 -- E1 NTU/ISDN PRI Transceiver

Datasheet

Figures

LXT318 Block Diagram ......................................................................................... 5

LXT318 Pin Assignments and Package Markings ................................................ 6

50% Duty Cycle Coding Diagram.......................................................................... 9

LXT318 Line Attenuation (LATN) Pulse Width Encoding .................................... 13

LXT318 Serial I/O Input Data Structure .............................................................. 14

LXT318 Serial I/O Output Data Structure............................................................ 15

LXT318 Interrupt Handling .................................................................................. 16

Transmit All Ones................................................................................................ 17

Local Loopback ................................................................................................... 18

Remote Loopback ............................................................................................... 19

Typical LATN Decoding Circuit ........................................................................... 20

Typical LXT318 Host Mode E1/NTU, 120

Twisted Pair Application ................ 22

Typical LXT318 Hardware Mode, 120

Twisted Pair Application...................... 23

Typical LXT318 Hardware Mode, 75

Coax Application ................................... 24

LXT318 Transmit Clock Timing ........................................................................... 27

LXT318 Receive Clock Timing ............................................................................ 27

LXT318 Serial Data Input Timing Diagram ......................................................... 28

LXT318 Serial Data Output Timing Diagram....................................................... 29

LXT318 Jitter Tolerance @ 43 dB (Typical) ........................................................ 29

LXT318 Jitter Attenuation (Typical)..................................................................... 30

Input and Maximum Output Jitter Specified by TBR12/13 .................................. 31

LXT318 Jitter Attenuation Performance (TypicalMeasured Against TBR12/13)31

2.048 Mbps Pulse Mask...................................................................................... 32

Package Specifications ....................................................................................... 33

Tables

Pin Descriptions .................................................................................................... 7

Unipolar Data I/O Pin Descriptions1 ..................................................................... 8

CLKE Settings..................................................................................................... 11

SIO Input Bits (See

Figure 5

) .............................................................................. 11

LXT318 Serial Data Output Bit Coding (See

Figure 6

) ....................................... 13

Line Attenuation Decoding .................................................................................. 20

Jitter Attenuator Crystal Specifications ............................................................... 21

Absolute Maximum Ratings ................................................................................ 25

Recommended Operating Conditions ................................................................. 25

Digital Characteristics (Over Recommended Operating Conditions) .................. 25

Analog Characteristics (Over Recommended Operating Conditions) ................. 26

LXT318 Master Clock and Transmit Timing Characteristics (See

Figure 15

) ..... 26

LXT318 Receive Timing Characteristics (See

Figure 16

) ................................... 27

LXT318 Serial I/O Timing Characteristics (See

Figure 17

and

Figure 18

) .......... 28

2.048 Mbps Pulse Mask Parameters .................................................................. 32

Document Outline

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LXT318PE

Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LXT318PE