The network cable used in the project should theoretically not exceed how many meters?

Question

Options

• A50
• B80
• C100
• D150

• A
  2% (1)
• B
  84% (51)
• C
  11% (7)
• D
  3% (2)

Explanation

Option B (80 meters) is correct because in structured cabling projects, the horizontal cable run should theoretically not exceed 80 meters, reserving the remaining 20 meters of the 100-meter IEEE Ethernet channel budget for patch cables and equipment cords at each end of the connection. Option A (50 meters) is too restrictive and does not reflect any recognized cabling standard, making it an unnecessary limitation. Option C (100 meters) refers to the total maximum channel length under the IEEE 802.3 standard, not the recommended limit for the permanent cable run in a project, which must account for patch cord allowances. Option D (150 meters) exceeds the absolute maximum for standard Ethernet and would result in signal degradation and unreliable connections.

Memory tip: Think of the 80-meter rule as the "safe zone" within the 100-meter Ethernet ceiling - 80 meters for the fixed cable run, and 20 meters left over for the flexible patch cords at each end.

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