Telecoms, Datacoms, Wireless, IoT


Eight-channel T1/E1/J1 ICs

2 September 2009 Telecoms, Datacoms, Wireless, IoT

Two new eight-channel communications devices from Exar are the XRT83VL38, a fully integrated long-haul and short-haul transceiver, and the XRT86VX38, a framer/line interface unit combo (LIU). Both devices support T1/E1/J1 data rates using Exar’s R3 Technology (reconfigurable, relayless redundancy) and exhibit low power and a small footprint suitable for high-density line cards for advanced networking and EoPDH platforms including multiplexers, switches, routers, digital cross connects and wireless backhaul systems.

The XRT83VL38 supports B8ZS, HDB3 and AMI encoding and decoding functions. The transmitter provides a selectable or a programmable transmit pulse shaper for flexibility with any type of T1 or E1 circuit. High performance is achieved via two on-chip crystalless jitter attenuators and adaptive receive equalisers. A variety of loop-back and diagnostic features support in-circuit fault isolation and help reduce development time.

The XRT86VX38 is an octal 1,544 Mbps or 2,048 Mbps DS1/E1/J1 universal integrated framer and LIU solution compliant to ANSI/ITU_T specifications, and provides many features for enhanced messaging and testability. The physical interface provides reconfigurablility with a choice of internal impedance, and relayless hot swap protection with redundancy circuits. The framer function provides finer granularity to monitor DS-0 timeslots. The device also has performance enhancing features including increased buffering, and hardware based messaging support for bit-oriented or packet-oriented network messaging protocols.



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