XRT7300

www.DataSheet4U.com áç FEBRUARY 2002 XRT7300 E3/DS3/STS-1 LINE INTERFACE UNIT REV. 1.1.1 GENERAL DESCRIPTION The XRT7300 DS3/E3/STS-1 Line Interface Unit is designed to be used in DS3, E3 or SONET STS-1 applications and consists of a line transmitter and receiver integrated on a single chip. XRT7300 can be configured to support the E3 (34.368 Mbps), DS3 (44.736 Mbps) or the SONET STS-1 (51.84 Mbps) rates. 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 transmission over coaxial cable via a 1:1 transformer. In the receive direction the XRT7300 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. The XRT7300 also contains a 4-Wire Microprocessor Serial Interface for accessing the on-chip Command registers. FIGURE 1. BLOCK DIAGRAM OF THE XRT7300 E3 STS-1/DS3 Host/(HW) FEATURES Meets E3/DS3/STS-1 Jitter Tolerance Requirements Full Loop-Back Capability Transmit and Receive Power Down Modes Full Redundancy Support 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 APPL...