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latency
Latency is the transmission delay created as a device processes a frame or packet. It is the duration from the time a device reads the first byte of a frame or packet, until the time it forwards that byte.

light-emitting diode (LED)
An LED is a device that converts electrical signals into light pulses.

local area network (LAN)
A network typically confined to a single building or floor of a building is referred to as a LAN.

local loop
A local loop is the pair of copper wires that connects a customer's telephone to the LEC's CO switching system.