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What is inside the SFP?

Unraveling the Enigma: Decoding SFP Transceiver Disassembly

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What is a Cisco GLC-SX-MMD?

What is the differences between 3 manufacturers? 
Vendor-name: CISCO-AVAGO 
Vendor-name: CISCO-FINISAR 
Vendor-name: CISCO-ACCELINK

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