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XRT73L04B

Exar Corporation
Part Number XRT73L04B
Manufacturer Exar Corporation
Description 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
Published Aug 20, 2007
Detailed Description www.DataSheet4U.com XRT73L04B 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT REV. 1.0.1 OCTOBER 2003 GENERAL DESCRIPTION ...
Datasheet PDF File XRT73L04B PDF File

XRT73L04B
XRT73L04B

Overview
www.
DataSheet4U.
com XRT73L04B 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT REV.
1.
0.
1 OCTOBER 2003 GENERAL DESCRIPTION The XRT73L04B, 4-Channel, DS3/E3/STS-1 Line Interface Unit is a low power CMOS version of the XRT73L04A and consists of four independent line transmitters and receivers integrated on a single chip designed for DS3, E3 or SONET STS-1 applications.
Each channel of the XRT73L04B can be configured to support the E3 (34.
368 Mbps), DS3 (44.
736 Mbps) or the SONET STS-1 (51.
84 Mbps) rates.
Each channel can be configured to operate in a mode/data rate that is independent of the other channels.
In the transmit direction, each channel encodes input data to either B3ZS (DS3/STS-1) or HDB3 (E3) format and converts the data into the appropriate pulse shapes for transmission over coaxial cable via a 1:1 transformer.
In the receive direction, the XRT73L04B performs equalization on incoming signals, performs Clock Recovery, decodes data from either B3ZS or HDB3 format, converts the receive data into TTL/CMOS format, checks for LOS or LOL conditions and detects and declares the occurrence of Line Code Violations.
FEATURES • Incorporates an improved Timing Recovery circuit and is pin and functional compatible to XRT73L04A • Meets E3/DS3/STS-1 Jitter Tolerance Requirements • Contains a 4-Wire Microprocessor Serial Interface • Full Loop-Back Capability • Transmit and Receive Power Down Modes • Full Redundancy Support • Uses Minimum External components • Single +3.
3V Power Supply • Low Power CMOS design • 5V tolerant I/O • -40°C to +85°C Operating Temperature Range • Available in a Thermally Enhanced 144 pin LQFP package APPLICATIONS • Digital Cross Connect Systems • CSU/DSU Equipment • Routers • Fiber Optic Terminals • Multiplexers • ATM Switches FIGURE 1.
XRT73L04B BLOCK DIAGRAM E3_(n) STS-1/DS3_(n) Host/(HW) RLOL_(n) EXClk_(n) RxOFF RxClkINV RTIP_(n) RRing_(n) REQEN_(n) AGC/ Equalizer Peak Detector Slicer Clock Recovery Data Recovery Invert RxClk_(n) LOSTHR ...


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