XRT75R06D

The XRT75R06D is a six-channel DS3/E3 Line Interface Unit (LIU) with desynchronizer with R³ Technology^TM. It incorporates an independent receiver for each channel, transmitter and jitter attenuator, and supports E3 (34.368.Mbps), DS3 (44.736Mbps) and STS-1 (51.84 Mbps) modes of operation. The device has a differential receiver, which provides a high noise interference margin capable of receiving data from cables of over 1,000 feet or up to 12dB of cable attenuation. It contains an onboard Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error. This function can be used for diagnostic purposes. The device meets jitter and wander specifications described in the T1.105.03b, and ETSI TBR-24, and is compliant with jitter transfer templates outlined in ITU G.751, G.752 and G.755. It also provides a serial microprocessor interface as well as hardware mode for configuration and control.

R³ Technology^TM Overview

Exar's R³ Technology^TM (Reconfigurable, Relayless Redundancy), first introduced in 2002 as a breakthrough capability delivering key benefits to customers designing T1/E1/J1 interface cards has now been extended to the higher speed DS3/E3 environment. Already 3 and 12 channel devices have been announced incorporating this revolutionary technology. The devices are frequency Reconfigurable enabling customers to build one board with a single bill-of-materials. In addition, the series employs Relayless Redundancy eliminating the need for external relays for 1:1 and 1+1 applications by establishing a back-up channel that can be brought on-line in the event of failure.

Receiver:

• R³ Technology^TM (Reconfigurable, Relayless, Redundancy)
• On chip Clock and Data Recovery for high-input jitter tolerance
• Meets DS3/E3/STS-1 Jitter Tolerance Requirements
• Detects and Clears LOS as per G.775

• Tri-state Transmit output capability for redundancy applications
• Compliant with Bellcore GR-499, GR-253 and ANSI T1.102 Specification for transmit pulse
• Transmitters can be turned on or off

• On-chip advanced crystal-less Jitter Attenuator for each channel
• 16 02 32 bits selectable FIFO size
• Meets ETSI TBR Jitter Transfer Requirements

• Parallel Microprocessor Interface for control ands configuration
• Each Channel supports Analog, Remote and Digital Loop-backs
• Single 3.3V ± 5% power supply
• Pb-Free, RoHS Compliant Versions Offered

• Digital Access and Cross Connect Systems
• Routers
• DSLAMs
• Fiber Optic Terminals