Copper, fiber, and DAC cabling for rack and campus connectivity.
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Cat6/6A copper handles 1G everywhere and 10G over shorter runs, and remains the default for office drops and access-layer patching. Fiber patch cables split by mode: multimode (OM3/OM4, aqua/violet) for in-building runs up to a few hundred meters, single-mode (OS2, yellow) for campus distances. DAC (direct-attach copper) cables connect SFP+/SFP28/QSFP ports directly over a few meters — the standard, economical choice for switch-to-server links inside a rack.
Match the connector and fiber type to your optics: an SR transceiver expects multimode with LC connectors, LR expects single-mode. If you are unsure, send the transceiver part numbers and link distances and we will spec every cable on the run.
For gigabit, both work; Cat6/6A adds headroom for 10GBase-T and better interference resistance, so it is the sensible default for new pulls and dense racks.
OM3/OM4 are multimode grades for short-range optics inside buildings (up to ~300-400m at 10G); OS2 is single-mode for long-range links across campuses and between sites.
For links under ~5 meters in the same rack or adjacent racks, a DAC is cheaper than two optics plus a fiber cable and performs identically.