The OC-48c/STM-16c POS line card provides Cisco 12000 series routers with a single 2.5-Gbps POS interface on a single card. The card interfaces with the switch fabric in the Cisco 12000 series router and provides one OC-48c/STM-16c duplex SC or FC single-mode connection. This connection is concatenated, which provides for increased efficiency by eliminating the need to partition the bandwidth.