XRT7250

• Transmits, Receives and Processes data in the DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3-ITU-T G.832 Framing Formats.
• Interfaces to all Popular Microprocessors
• Integrated Framer Performance Monitor
• Available in a 100 Pin PQFP package
• Operating Temperature -40  to +85

The XRT7250 DS3/E3 Framer IC is designed to accept "User Data" from the Terminal Equipment and insert this data into the "payload" bit-fields within an "outbound" DS3/E3 Data Stream. Further, the Framer IC is also designed to receive an "inbound" DS3/E3 Data Stream (from the Remote Terminal Equipment) and extract out the "User Data".

The XRT7250 DS3/E3 Framer is designed to support full-duplex data flow between Terminal Equipment and an LIU (Line Interface Unit) IC. The Framer Device will transmit, receive and process data in the DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3- ITU-T G.832 Framing Formats.

The XRT7250 DS3/E3 Framer IC consists of four sections. The Transmit Section, includes a Transmit Payload Data Input Interface, a Transmit Overhead data Input Interface Section, a Transmit HDLC Controller, a Transmit E3/DS3 Framer block and a Transmit LIU Interface Block which permits the Terminal Equipment to transmit data to a remote terminal.

The Receive Section, consists of a Receive LIU Interface, a Receive E3/DS3 Framer, a Receive HDLC Controller, a Receive Payload Data Output Interface, and a Receive Overhead Data Interface which allowsthe local terminal equipment to receive data from remote terminal equipment.

The Microprocessor Interface is used to configure the Framer IC in different operating modes and monitor the performance of the Framer.

The Performance Monitor Section consists of a large number of "Reset-upon-Read" and "Read-Only" registers that contain cumulative and "one-second" statistics that reflect the performance/health of the Framer IC/system.