XRT73LC00A E3/DS3/STS-1 LINE INTERFACE UNIT MAY 2011 REV. 1.0.2 GENERAL DESCRIPTION FEATURES The XRT73LC00A DS3/E3/STS-1 Line Interface Unit Incorporates an improved Timing Recovery circuit is a low power CMOS version of the XRT73L00A and and is pin and functional compatible to XRT73L00A consists of a line transmitter and receiver integrated Meets E3/DS3/STS-1 Jitter Tolerance on a single chip and is designed for DS3, E3 or Requirements SONET STS-1 applications. Full Loop-Back Capability XRT73LC00A can be configured to support the E3 Transmit and Receive Power Down Modes (34.368 Mbps), DS3 (44.736 Mbps) or the SONET STS-1 (51.84 Mbps) rates. Full Redundancy Support In the transmit direction, the XRT73LC00A encodes Contains a 4-Wire Microprocessor Serial Interface input data to either B3ZS (for DS3/STS-1 Uses Minimum External components applications) or HDB3 (for E3 applications) format Low Power CMOS Design and converts the data into the appropriate pulse shapes for transmission over coaxial cable via a 1:1 Single +3.3V Power Supply transformer. 5 V Tolerant pins In the receive direction the XRT73LC00A performs -40C to +85C Operating Temperature Range equalization on incoming signals, performs Clock Recovery, decodes data from either B3ZS or HDB3 Available in a 44 pin TQFP package format, converts the receive data into TTL/CMOS APPLICATIONS 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 The XRT73LC00A also contains a 4-Wire CSU/DSU Equipment Microprocessor Serial Interface for accessing the on- PCM Test Equipment chip Command registers. Fiber Optic Terminals Multiplexers Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XRT73LC00A E3/DS3/STS-1 LINE INTERFACE UNIT REV. 1.0.2 FIGURE 1. BLOCK DIAGRAM OF THE XRT73LC00A E3 STS-1/DS3 Host/(HW) RLOL EXCLK ICT RCLKINV RTIP RCLK1 AGC/ Clock Slicer Invert RRING Equalizer Recovery LCV/(RCLK2) Peak REQDIS Data HDB3/ RPOS Detector Recovery B3ZS RNEG Decoder LOS Detector LOSTHR DR/SR SDI RLOS SDO/(LCV) Serial Processor LLB SClk Loop MUX Interface RLB CS ENDECDIS REGRESET TAOS TPDATA TTIP HDB3/ Transmit Pulse B3ZS Logic TNDATA Shaping Encoder Duty Cycle Adjust TClk TRING TXLEV MTIP Tx Device Control TXOFF Monitor MRING DMO ORDERING INFORMATION PART NUMBER PACKAGE TYPE OPERATING TEMPERATURE RANGE XRT73LC00AIV 44 Pin TQFP (10mm x 10mm) -40C to +85C 2