Maximum Length Of Patch Cords
- The maximum length of the work area patch cord is 22 meters or 72 feet. For purposes of calculating the horizontal cable and the work area cord, the formula is: C = (102 - H) / (1 + D) where 102 is 102 meters. Where: C = maximum combined length of the work area cable, equipment cable and patch cord.
- Note: Beyond 20 meters the maximum length of 28 AWG patch cords may be limited by DC Loop Resistance. Panduit’s 28 AWG Category 6A performance patch cords are limited to a maximum length of 40. Meters in point-to-point applications (using only patch, with no horizontal cable).
Opti-Core® Fiber Optic Patch Cords and Pigtails provide interconnect and cross-connect of. 7 Length Patch cords: 1m – 10m, 15m, 20m, 25m and 30m lengths.
The total Ethernet run from the distribution or patch panel to the end component is the baseline environmental expectation in the design of Ethernet cables. In these cases, the maximum recommended link for a Category 5e Ethernet cable is 100 meters, roughly 330 feet.
The cables used for this are assumed to be 22- or 24-gauge unshielded twisted pair Ethernet wires. Remember the 100-meter total includes jumper cables from wall plates to computers, and those have their own max length specifications. Crosslinks are jumper cables, linking routers and switches. In this case, the recommended cable length is limited functionally to roughly 20 feet. This is rarely needed, since most of these devices are located in close proximity to one another.
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These distances are supported by the fact most of these devices have some degree of signal boosting and equalization. In all cases, using the shortest possible cable is recommended to retain flexibility in runs from these devices to the individual computers on the network. Ethernet cables should always be twisted fully up until the final inch of the end of the cable, as it enters the RJ-45 jack. Inconsistencies in this configuration will result in intermittent or failed network performance.
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Do-it-yourselfers need to remember these cables must be properly terminated using an RJ-45 connector with the appropriate modular crimping tool. All Ethernet cables must remain nick-free. Use of shielded twisted pair cables is recommended when the cables run next to AC power lines or other electronic devices, minimizing external interference.