XRT83SH314 データシートの表示（PDF） - Exar Corporation

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XRT83SH314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

XRT83SH314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

OCTOBER 2006

REV. 1.0.4

GENERAL DESCRIPTION

The XRT83SH314 is a fully integrated 14-channel

short-haul line interface unit (LIU) that operates from

a single 3.3V power supply. Using internal

termination, the LIU provides one bill of materials to

operate in T1, E1, or J1 mode independently on a per

channel basis with minimum external components.

The LIU features are programmed through a standard

microprocessor interface. EXAR’s LIU has patented

high impedance circuits that allow the transmitter

outputs and receiver inputs to be high impedance

when experiencing a power failure or when the LIU is

powered off. Key design features within the LIU

optimize 1:1 or 1+1 redundancy and non-intrusive

monitoring applications to ensure reliability without

using relays.

The on-chip clock synthesizer generates T1/E1/J1

clock rates from a selectable external clock frequency

and has five output clock references that can be used

for external timing (8kHz, 1.544Mhz, 2.048Mhz,

nxT1/J1, nxE1).

Additional features include RLOS, a 16-bit LCV

counter for each channel, AIS, QRSS/PRBS

generation/detection, TAOS, DMO, and diagnostic

loopback modes.

APPLICATIONS

• T1 Digital Cross Connects (DSX-1)

• ISDN Primary Rate Interface

• CSU/DSU E1/T1/J1 Interface

• T1/E1/J1 LAN/WAN Routers

• Public Switching Systems and PBX Interfaces

• T1/E1/J1 Multiplexer and Channel Banks

• Integrated Multi-Service Access Platforms (IMAPs)

• Integrated Access Devices (IADs)

• Inverse Multiplexing for ATM (IMA)

• Wireless Base Stations

FIGURE 1. BLOCK DIAGRAM OF THE XRT83SH314

TCLK_n

TPOS_n

TNEG_n

TxON

RPOS_n

RCLK_n

RNEG_n

ICT

TEST

ATP_TIP

ATP_RING

1 of 14 Channels

Driver

Monitor

HDB3/B8ZS

Encoder

Tx/Rx Jitter

Attenuator

Timing

Control

Tx Pulse

Shaper &

Pattern Gen

Remote

Loopback

Digital

Loopback

QRSS

Generation

& Detection

Line

Driver

Analog

Loopback

HDB3/B8ZS

Decoder

Tx/Rx Jitter

Attenuator

Clock & Data

Recovery

Peak

Detector

& Slicer

AIS & LOS

Detector

Test

Microprocessor

Interface

Programmable Master

Clock Synthesizer

DMO

TTIP_n

TRING_n

RTIP_n

RRING_n

RLOS

RCLKOUT

RxON

RxTSEL

8kHzOUT

MCLKE1out

MCLKT1out

MCLKE1Nout

MCLKT1Nout

FEATURES

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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