Cisco 800-21486-06 OC3 POS MM Interface Card Module

Cisco 800-21486-06 OC3 POS MM Interface Card Module is a four-port OC-3 Packet-over-SONET (POS) interface card designed for Cisco GSR 12000 systems. It is referenced as 4OC3X POS-MM-MJ-B with ENG3 Release B and carries the part number 800-21486-06. This module provides four OC-3 POS MM ports on a single interface card, enabling multiple OC-3 POS traffic streams to be handled within a single GSR 12000 deployment. As an interface card module, it is intended to be installed in a compatible Cisco chassis to extend OC-3 POS connectivity on the router, rather than functioning as an independent device. The ENG3 Release B engineering revision indicates its alignment with the GSR 12000 hardware and software environment for reliable operation. In short, this is a specialized Cisco add-on that expands WAN transport capabilities by delivering four OC-3 POS MM interfaces through a compact module within the Cisco GSR 12000 backbone platform.