ALCATEL 3AL78821BAAF -Lucent 1660SM P4S1N Telecom System Card / Module

The Alcatel-Lucent 3AL78821BAAF is a P4S1N port card for the Alcatel-Lucent 1660SM SDH optical transmission platform, a widely deployed metro and regional transport system supporting speeds up to STM-64. The P4S1N is a 4 x STM-1 electrical/optical port card that processes up to four STM-1 tributary or aggregate streams, and is designed to work alongside the 1660SM’s A2S1 access card within the same subrack slot group. Port cards of this type form the interface layer of the 1660SM, sitting between the system’s cross-connect matrix (handled by MATRIX-type cards) and the external optical or electrical STM-1 line connections, so a working P4S1N is essential wherever four STM-1 circuits need to terminate on a given shelf. This unit carries the AF revision suffix, part of the wider 3AL78821B family of P4S1N cards used across 1660SM/1662SMC deployments; the base board type and function are confirmed and consistent across the family’s revision variants. It is commonly sourced as a tested pull when maintaining or expanding an existing 1660SM ring, particularly in networks facing manufacturer end-of-life on new-build SDH hardware. Tech-Star (UK-based, shipped worldwide) stocks tested Alcatel-Lucent 1660SM cards including port, matrix and power units; contact our engineers to confirm the right revision for your shelf before ordering.