XRT72L56

www.DataSheet4U.com áç JANUARY 2001 PRELIMINARY XRT72L56 REV. P1.1.2 SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER GENERAL DESCRIPTION The XRT72L56, 6 Channel DS3/E3 Framer is designed to accept “User Data” from the Terminal Equipment and insert this data into the “payload” bitfields within an “outbound” DS3/E3 Data Stream. The XRT72L56 DS3/E3 Framer support full-duplex data flow between Terminal Equipment and an LIU (Line Interface Unit) . The Framer will transmit, receive and process data in the DS3-C-bit Parity, DS3M13, E3-ITU-T G.751 and E3-ITU-T G.832 Framing Formats. In addition, XRT72L56 has 6 independent high speed HDLC controllers both on the receive and transmit data paths which can be optionally configured to support Framer Relay applications. The Transmit Sections, include a Transmit Payload Data Input Interface, a Transmit Overhead data Input Interface Section, a Transmit HDLC Controller, a Transmit DS3/E3 Framer block and a Transmit LIU Interface Block which permits the Terminal Equipment to transmit data to a remote terminal. The Receive Sections, consist of a Receive LIU Interface, a Receive DS3/E3 Framer, a Receive HDLC Controller, a Receive Payload Data Output Interface, and a Receive Overhead Data Interface which allows the local terminal equipment to receive data from remote terminal equipment. FIGURE 1. BLOCK DIAGRAM OF THE XRT72L56 The Microprocessor Interface is used to configure the Framer in different operating modes and monitor the performa...