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PE-68629 PDF预览

PE-68629

更新时间: 2024-11-07 22:44:31
品牌 Logo 应用领域
艾科嘉 - EXAR 变压器
页数 文件大小 规格书
55页 574K
描述
E3/DS3/STS-1 LINE INTERFACE UNIT

PE-68629 数据手册

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áç  
XRT7300  
E3/DS3/STS-1 LINE INTERFACE UNIT  
FEBRUARY 2002  
REV. 1.1.1  
FEATURES  
GENERAL DESCRIPTION  
Meets E3/DS3/STS-1 Jitter Tolerance Require-  
ments  
The XRT7300 DS3/E3/STS-1 Line Interface Unit is  
designed to be used in DS3, E3 or SONET STS-1 ap-  
plications and consists of a line transmitter and re-  
ceiver integrated on a single chip.  
Full Loop-Back Capability  
Transmit and Receive Power Down Modes  
Full Redundancy Support  
XRT7300 can be configured to support the E3  
(34.368 Mbps), DS3 (44.736 Mbps) or the SONET  
STS-1 (51.84 Mbps) rates.  
Contains a 4-Wire Microprocessor Serial Interface  
Uses Minimum External components  
Requires Single +5V Power Supply  
-40°C to +85°C Operating Temperature Range  
Available in a 44 pin TQFP package  
In the transmit direction, the XRT7300 encodes input  
data to either B3ZS (for DS3/STS-1 applications) or  
HDB3 (for E3 applications) format and converts the  
data into the appropriate pulse shapes for transmis-  
sion over coaxial cable via a 1:1 transformer.  
APPLICATIONS  
In the receive direction the XRT7300 performs equal-  
ization on incoming signals, performs Clock Recov-  
ery, 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.  
Interfaces to E3, DS3 or SONET STS-1 Networks  
CSU/DSU Equipment  
PCM Test Equipment  
Fiber Optic Terminals  
Multiplexers  
The XRT7300 also contains a 4-Wire Microprocessor  
Serial Interface for accessing the on-chip Command  
registers.  
NOTE: This Device is Protected by US Patent # 6,157,270  
FIGURE 1. BLOCK DIAGRAM OF THE XRT7300  
E3  
STS-1/DS3  
Host/(HW)  
RLOL EXCLK  
ICT  
RCLK2INV  
RTIP  
RCLK1  
AGC/  
Equalizer  
Clock  
Recovery  
Slicer  
Invert  
RRING  
LCV/(RCLK2)  
Peak  
Detector  
REQDIS  
Data  
Recovery  
RPOS  
RNEG  
HDB3/  
B3ZS  
Decoder  
LOS Detector  
LOSTHR  
SDI  
DECODIS  
RLOS  
SDO/(LCV)  
SClk  
Serial  
Processor  
Interface  
LLB  
Loop MUX  
RLB  
CS  
ENCODIS  
TAOS  
REGRESET  
TPDATA  
TNDATA  
TClk  
TTIP  
HDB3/  
B3ZS  
Encoder  
Transmit  
Logic  
Pulse  
Shaping  
Duty Cycle Adjust  
TRING  
TXLEV  
TXOFF  
Tx  
Control  
MTIP  
MRING  
DMO  
Device  
Monitor  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com  

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