High-Performance Networking: A Deep Dive into the Cisco QSFP-40G
Unlike the QSFP-40G-SR4 (which uses MPO connectors), the QSFP-40G-LR4-S uses a Duplex LC interface and WDM technology to combine four wavelengths onto two fibers.
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LC to LC connection from switch to switch inbetween Patch Panels
If you connect both sides of the cable to your switches and the link light does not come up, you can simply switch the strand around at one side of the connection and that should bring up