the Transition Networks Tn-qsfp-40g Series 40g Qsfp+ Optical Transceivers Are Designed To Install In Any Qsfp+ Port Allowing For 40gbase-x Interfaces To The Network Through The Qsfp+ Connector. The Tn-qsfp-40g Transceivers Are Cisco Compliant And Are Designed For Bi-directional Serialoptical Data Communication Such As 40g Ethernet.applications Include: 40g Ethernet, 10g Ethernet, And Data Center Aggregation Connection.