xrt59l921 Exar Corporation, xrt59l921 Datasheet

xrt59l921

Manufacturer Part Number

xrt59l921

Description

Xrt59l921 -twenty-one Channel E1 Line Interface Unit

Manufacturer

Exar Corporation

Datasheet

1.XRT59L921.pdf (32 pages)

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MARCH 2007

GENERAL DESCRIPTION

The XRT59L921 is an optimized twenty-one channel,

E1, line interface unit, fabricated using low power

CMOS technology. The device contains twenty-one

independent E1 channels. It is primarily targeted

towards the SDH multiplexers that accommodate

TU12 Tributary Unit Frames. Line cards in these units

multiplex 21 E1 channels into higher SDH rates.

Devices with 21 E1 interfaces such as the

XRT59L921 provide the most efficient method of

implementing 63-channel line cards. Each channel

performs the driver and receiver functions necessary

to convert bipolar signals to logical levels and vice

versa.

The receiver input accepts transformer coupled 1:1

signals, while the transmitter is coupled to the line

using a 1:2 transformer. The same transformer

configuration can be used for both balanced and

unbalanced interfaces. The device offers Loss of

Signal (LOS) detection, that provides an LOS output

indication signal with thresholds and delay that

comply with the ITU G.775 requirements.

Exar

IGURE

Corporation 48720 Kato Road, Fremont CA, 94538

RRing_0

TRing_0

RTIP_0

TTIP_0

1. B

TxON

LOCK

IAGRAM OF THE

Equalizer

Receive

Equalizer

Receive

Pulse Shaping Circuit

XRT59L921

Peak Detector/Slicer

LOS Detector

TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

•

(510) 668-7000

FEATURES

•

APPLICATIONS

•

Twenty-One (21) Independent E1 (CEPT) Line

Interface

Recovery)

Transmit Output Pulses that are Compliant with the

ITU-T G.703 Pulse Template Requirement for

2.048Mbps (E1) Rates

On-Chip Pulse Shaping for both 75Ω and 120Ω line

drivers

Detects and Clears LOS (Loss of Signal) Per ITU-T

G.775

Operates over the Industrial Temperature Range

Ultra Low power consumption

3.3V operation with 5V Tolerant Input

PDH Multiplexers

SDH Multiplexers

Digital Cross-Connect Systems

DECT (Digital European Cordless Telephone) Base

Stations

CSU/DSU Equipment

Transmit Input Interface

Receive Output

•

Receive Output

FAX (510) 668-7017

Interface

Units

Interface

Channel 0

(Transmitter,

Channels 2 - 20

Channel 1

XRT59L921

•

www.exar.com

Receiver,

LOS_0

RxPOS_0

RxNEG_0

TxPOS_0

TxCLK_0

TxNEG_0

REV. 1.2.1

and

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