XRT59L921

更新时间： 2024-11-11 03:13:51

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
32页	821K
描述
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

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XRT59L921 数据手册

XRT59L921

TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

MARCH 2007

REV. 1.2.1

FEATURES

GENERAL DESCRIPTION

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

Interface Units (Transmitter, Receiver, and

Recovery)

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.

• 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

APPLICATIONS

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.

• PDH Multiplexers

• SDH Multiplexers

• Digital Cross-Connect Systems

• DECT (Digital European Cordless Telephone) Base

Stations

• CSU/DSU Equipment

FIGURE 1. BLOCK DIAGRAM OF THE XRT59L921

Channels 2 - 20

Channel 1

Channel 0

LOS_0

LOS Detector

RTIP_0

RxPOS_0

RxNEG_0

Receive Output

Receive

Equalizer

Peak Detector/Slicer

Receive Output

Interface

Receive

RRing_0

Interface

TTIP_0

TxPOS_0

TxCLK_0

TxNEG_0

Pulse Shaping Circuit

Transmit Input Interface

TRing_0

TxON

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

12 3 4 5 6 7...32

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