Cisco QSFP-40G-ER4

The Cisco QSFP-40G-ER4 is a transceiver module designed for high-speed data transmission over long distances in a network. It is part of the Cisco Quad Small Form-Factor Pluggable (QSFP) family and supports a data rate of 40 Gigabits per second (Gbps). The "ER4" in the name stands for Extended Reach 4, indicating that this transceiver is capable of transmitting data over an extended distance. It uses four wavelengths (1310 nm) to achieve a reach of up to 40 kilometers (24.85 miles) on single-mode fiber. The Cisco QSFP-40G-ER4 is commonly used in data centers, telecommunications networks, and other high-bandwidth applications where long-distance connectivity is required.