Alcatel-Lucent 3AL78831AA Network Module System

The Alcatel-Lucent 3AL78831AA is a 21×2 Mbit/s, 75-ohm tributary interface module designed for the Alcatel-Lucent 1660SM and 1650SM-C nodes within the 1600 Series transport family. This plug-in card provides twenty-one 2-Mbit/s tributaries on a 75-ohm electrical interface, enabling the aggregation of low-rate services into the SDH/PDH transport path used by Alcatel-Lucent's MSPP platforms. It is intended for use in metro-access networks, serving as the interface point between customer lines and the carrier-grade SDH fabric and allowing provisioning of multiple low-bandwidth channels from a single card. The part number 3AL78831AA uniquely identifies this module within Alcatel-Lucent's 1600-Series portfolio and it fits into compatible 1600-series slots on 1660SM and 1650SM-C installations, supporting maintenance, upgrades, or replacements in existing deployments. This module is part of the broader Alcatel-Lucent 1600 Series ecosystem that spans devices in the 1640/1650/1660 family, designed for scalable, multi-service transport in access networks.