Exar's new addition to its recently launched next generation silicon solution family incorporates its unique line interface unit (LIU) and framer in one combination device. The XRT86L34 is a four-channel (quad) chip targeted at telecommunications equipment including wireless base stations, digital access and cross connect systems, and channel service units (CSUs) among others.
The XRT86L34 is a four-channel physical-layer processor incorporating a T1/E1 (1,544 Mbps or 2,048 Mbps) framer and an LIU. Each of the four framers has both a framing synchronizer and transmit and receive slip buffers. Each framer also contains transmit and overhead data input ports, which permits data line terminal equipment direct access to the out-bound T1/E1/J1 frames. In the receive direction, it has complementary blocks to the transmit path. In addition, the XRT86L34 includes a PRBS, QRSS and network loop up/down code generator/detector. The device detects standard framing and signal error conditions. The microprocessor interface is very flexible allowing for easy configuration, control, and status monitoring. Furthermore, the device has an integrated HDLC controller with two 96-byte transmit, and two 96-byte receive HDLC buffers.
The device leverages Exar's R3 Technology (reconfigurable, relayless redundancy) that provides key benefits to designers of T1/E1/J1 interface cards.
The XRT86L34 device is compliant with all major T1/E1/J1 specifications and comes in a 225 PBGA package.
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