3Com 3C16930 enterprise networking (SuperStack / LinkBuilder / OfficeConnect / CoreBuilder families) Switch / Carrier Ethernet Line Card

The 3Com 3C16930 is a SuperStack II Switch ATM OC-3 Multimode Module, an ATM expansion module providing an OC-3 (155Mbps) multimode-fibre interface for the SuperStack II switch range. ATM (Asynchronous Transfer Mode) was used through the mid-to-late 1990s as a backbone technology in some enterprise and campus networks, and modules such as this let a SuperStack II switch connect into an ATM backbone or WAN service at OC-3 speeds rather than relying solely on Ethernet uplinks. It reflects the multi-protocol expansion capability 3Com built into the SuperStack II chassis range before Ethernet backbones became near-universal. This is legacy equipment from a technology generation now rarely deployed new, and a genuine spare such as this supports existing installations still running ATM interconnects. Tech-Star (UK-based, shipped worldwide) stocks 3Com components to support ongoing network maintenance projects.