3.4.1. Installation Locations and Cabling

Distribution Frames:

• MDF (Main Distribution Frame): Primary location where external connections (ISP, WAN) enter and core equipment resides
• IDF (Intermediate Distribution Frame): Secondary closets extending connectivity closer to users

Installation Considerations:

• Rack size: Standard is 19" width; height measured in "U" (1U = 1.75")
• Port-side exhaust/intake: Manage airflow; hot-aisle/cold-aisle design prevents recirculation
• Cable management: Patch panels, cable trays, proper labeling
• Physical security: Lockable cabinets for network equipment

Structured Cabling:

• Patch panels: Central termination point for horizontal cabling
• Fiber distribution panels: Organize fiber connections
• Cable runs: Horizontal (to workstations) and backbone/vertical (between floors)
• Distance limit (TIA-568): A horizontal run from the patch panel to the wall jack is at most 90 m, leaving 10 m for patch cords within the 100 m Ethernet channel
• Bend radius: Never bend cable tighter than its rated minimum. Over-bent fiber leaks light (attenuation) or cracks; over-bent copper loses performance
• Labeling: Label both ends of every cable with its source and destination (for example, patch panel port and wall jack)
• Terminating copper: Strip the jacket, untwist and arrange the pairs in T568A or T568B order (T568B: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown), trim evenly, push the wires fully into the RJ45, crimp, then verify with a cable tester