Computer Room RULES

Clearly label all equipment with its hostname or other identifier, on both the front and back panels.
Label all peripherals with the hostname and device name or number (e.g. host:c1t2).
Label all cords and cables greater than 1 meter long, at both ends, with the name of the host or equipment, the port number on the equipment if more than one (e.g. host:le0), and the type of cable if ambiguous (e.g. "RS-232" on RJ-11 cords).
Label phone cords with their type and group-number (e.g. "Modem 1", "ISDN 3") at both ends, and each jack with its directory number.
Label data circuit cords (e.g. RJ-48S), at both ends, with the name of the far end of the circuit (e.g. "Trumbull"), and each jack with its circuit identifier.

Do not run any cables across the floor, or suspended in a catenary.
Run all cables inside an approved cable duct, even under a raised floor.
Support all cables greater than 1 meter long at regular intervals along their length, not more than 0.5 meter apart. Tie cables to fixed supports near the ends.
Run cables between enclosures only through the intended entry areas. Close all doors and panels afterward.
Do not run "temporary" cords or cables in violation of these rules, even for an instant. GET A LONGER CABLE. Where electrical specifications limit cable length (e.g. SCSI), relocate the equipment.