XRT83SL38

• Fully integrated eight channel short-haul transceivers for E1,T1 or J1 applications
• Programable Transmit Pulse Shaper for E1,T1 or J1 short-haul interfaces
• Five fixed transmit pulse settings for T1 short-haul applications plus a fully programmable waveform generator for transmit output pulse shaping available for both T1 and E1 modes
• Selectable receiver sensitivity from 0 to 36dB cable loss
• Receive monitor mode handles 0 to 29dB resistive attenuation along with 0 to 6dB of cable attenuation for E1 and 0 to 3dB of cable attenuation for T1 modes
• Supports 75W and 120W (E1), 100W (T1) and 110W (J1) applications
• Internal and/or external impedance matching for 75W, 100W, 110W and 120W
• Tri-State transmit output and receive input capability for redundancy applications
• Provides High Impedance for Tx and Rx during power off
• Transmit return loss meets or exceeds ETSI 300- 166 standard
• On-chip digital clock recovery circuit for high input jitter tolerance
• Crystal-less digital jitter attenuator with 32-bit or 64- bit FIFO selectable either in transmit or receive path
• On-chip frequency multiplier generates T1 or E1 Master clocks from variety of external clock sources
• High receiver interference immunity
• On-chip transmit short-circuit protection and limiting, and driver fail monitor output (DMO)
• Receive loss of signal (RLOS) output
• On-chip HDB3/B8ZS/AMI encoder/decoder functions
• QRSS pattern generator and detection for testing and monitoring
• Error and Bipolar Violation Insertion and Detection
• Receiver Line Attenuation Indication Output in 1dB steps
• Network Loop-Code Detection for automatic Loop- Back Activation/Deactivation
• Transmit All Ones (TAOS) and In-Band Network Loop Up and Down code generators
• Supports Local Analog, Remote, Digital and Dual Loop-Back Modes
• Meets or exceeds T1 and E1 short-haul network access specifications in ITU G.703, G.775, G.736

The XRT83SL38 is a fully integrated Octal (eight channel) short-haul line interface unit for T1 (1.544Mbps) 100W, E1 (2.048Mbps) 75W or 120W, or J1 110W applications. In T1 applications, the XRT83SL38 can generate five transmit pulse shapes to meet the short-haul Digital Cross-Connect (DSX-1) template requirements. 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 arbitrary pulse generators are available in both T1 and E1 modes).

The XRT83SL38 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 XRT83SL38 provides a variety of loop-back and diagnostic features as well as transmit driver short circuit detection and receive loss of signal monitoring. It supports internal impedance matching for 75W, 100W, 110W and 120W for both transmitter and receiver. In the absence of the power supply, the transmit outputs and receive inputs are tri-stated allowing for redundancy applications The chip includes an integrated programmable clock multiplier that can synthesize T1 or E1 master clocks from a variety of external clock sources.