Twinaxial (Direct Attach Copper / DAC) cables can plug directly into QSFP ports without needing separate optical transceivers. They are cost-effective for short-distance, high-speed connections (commonly in data centers).
A. Multimode fiber requires SFP/QSFP transceivers to convert electrical signals to optical.
C. RG11 is coaxial cable for broadband/cable TV, not used in QSFP ports.
D. Category 6 is twisted-pair Ethernet cabling, not directly compatible with QSFP ports.
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