The Cisco A9K-4HG-FLEX-TR is a line card for the Cisco ASR 9000 Series routers. It offers four ports of 100 Gigabit Ethernet QSFP28 connectivity, providing high-density and high-bandwidth capabilities. “FLEX” indicates its flexible port configuration options. “TR” likely signifies a specific optics or transceiver compatibility. This line card is designed for service provider edge and core applications, supporting high-capacity transport and aggregation.
