MDF
Center of a network, usually in a datacenter
IDF
Extension of MDF, directly connected, smaller branch of network
Usual rack size, usual height
19 inches wide, 1U = 1.75 inches
Patch Panel and Punchdown
Used for organizing cables. Patch Panels are in rack, Punchdowns go to user desks
Fiber Distribution Panel
Permanent fiber distribution for connections. Consider bend radius
Ampere
Rate of electron flow in a second, diameter of hose
Voltage
Potential energy of electrical pressure, how open the faucet is
UPS
Uninterruptible power supply, battery backup
PDU
Usually in a rack, monitors and controls power, can individually shut off outlets