C109519 Nokia Nokia Optical Transport Telecom System Card

The Nokia C109519, designated ET16, is an expansion termination module designed for use within Nokia’s optical transport and transmission network infrastructure. This card provides termination and interface capabilities for network expansion, supporting the integration of additional channels or connections within the transport system.

The ET16 module is typically deployed in Nokia’s optical networking platforms, where it serves to extend system capacity or provide specific termination functions for wavelength division multiplexing (WDM) or synchronous digital hierarchy (SDH) applications. It forms part of the broader Nokia optical transport portfolio used in carrier and enterprise backbone networks.

This is a legacy Nokia component from their established optical networking product lines. While these systems remain in active service across many telecommunications networks worldwide, newer deployments may utilise updated platform generations. The ET16 continues to be sought for maintenance, capacity upgrades, and network sustainment purposes.

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