GENERAL DESCRIPTION

The XRT83L30 is a fully integrated single-channel long-haul and short-haul line interface unit for T1(1.544Mbps) 100Ω, E1(2.048Mbps) 75Ω or 120Ω and J1 110Ω applications.

FEATURES

• Fully integrated single-channel long-haul and short-haul transceiver for E1,T1 or J1 applications.

• Adaptive Receive Equalizer for cable attenuation of up to 45dB for T1 and 43dB for E1.

• Programmable 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.

• Programmable Transmit Line Build-Outs (LBO) for T1 long-haul application from 0dB to -22.5dB in three 7.5dB steps.

• Tri-State transmit output and receive input capability for redundancy applications

• Selectable receiver sensitivity from 0 to 36dB or 0 to 45dB cable loss for T1 @772kHz and 0 to 43dB for E1 @1024kHz.

• High receiver interference immunity

• Receive monitor mode handles 0 to 29dB resistive attenuation along with 0 to 6dB of cable attenuation for both T1 and E1 modes.

• Supports 75Ω and 120Ω (E1), 100Ω (T1) and 110Ω (J1) applications.

• Internal and external impedance matching for 75Ω,100Ω, 110Ω and 120Ω.

• 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

• 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

• QRSS pattern generation 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 Analog, Remote, Digital and Dual Loop-Back Modes

• Meets or exceeds T1 and E1 short-haul and long-haul network access specifications in ITU G.703, G.775, G.736 and G.823; TR-TSY-000499; ANSI T1.403 and T1.408; ETSI 300-166 and AT&T Pub 62411

• Supports both Hardware and serial Microprocessor interface for programming

• Programmable Interrupt

• Low power dissipation

• Logic inputs accept either 3.3V or 5V levels

• Single +3.3V Supply Operation

• 64 pin TQFP package

• -40°C to +85°C Temperature Range

APPLICATIONS

• T1 Digital Cross-Connects (DSX-1)

• ISDN Primary Rate Interface

• CSU/DSU E1/T1/J1 Interface

• T1/E1/J1 LAN/WAN Routers

• Public switching Systems and PBX Interfaces

• T1/E1/J1 Multiplexer and Channel Banks