XRT83L34

www.DataSheet4U.com PRELIMINARY XRT83L34 REV. P1.3.4 QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR FEBRUARY 2004 GENERAL DESCRIPTION The XRT83L34 is a fully integrated Quad (four channel) long-haul and short-haul line interface unit for T1 (1.544Mbps) 100Ω, E1 (2.048Mbps) 75Ω or 120Ω, or J1 110Ω applications. In long-haul applications the XRT83L34 accepts signals that have been attenuated from 0 to 36dB at 772kHz in T1 mode (equivalent of 0 to 6000 feet of cable loss) or 0 to 43dB at 1024kHz in E1 mode. In T1 applications, the XRT83L34 can generate five transmit pulse shapes to meet the short-haul Digital Cross-Connect (DSX-1) template requirements as well as for Channel Service Units (CSU) Line Build Out (LBO) filters of 0dB, -7.5dB -15dB and -22.5dB as required by FCC rules. It also provides programmable transmit pulse generators for each channel that can be used for output pulse shaping allowing performance improvement over a wide variety of conditions. The XRT83L34 provides both a parallel Host microprocessor interface as well as a Hardware mode for programming and control. Both the B8ZS and HDB3 encoding and decoding functions are selectable as well as AMI. An on-chip crystal-less jitter attenuator with a 32 or 64 bit FIFO can be placed either in the receive or the transmit path with loop bandwidths of less than 3Hz. The XRT83L34 provides a variety of loop-back and diagnostic features as well as transmit driver short circuit detection and...