loop-back

In telecommunication, the term loop-back has the following meanings: 1. A method of performing transmission tests of access lines from the serving switching center, which method usually does not require the assistance of personnel at the served terminal. 2. A method of testing between stations (not necessarily adjacent) wherein two lines are used, with the testing being done at one station and the two lines interconnected at the distant station. 3. A patch, applied manually or automatically, remotely or locally, that facilitates a loop-back test. Source: from Federal Standard 1037C and from MIL-STD-188

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launch numerical aperture
layer
layered system
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leaky ray
limiting
linear polarization
line code
network repeaters
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link level

link quality analysis
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loading
loading characteristic
loading coil
lobe
local access and transport area
local battery
local call
lockout (telecommunication)
log periodic antenna

long haul communications
longitudinal redundancy check
longitudinal voltage
long term stability
loop gain
low performance equipment
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machine readable medium
magneto ionic double refraction
magneto optic effect
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main lobe
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manchester code
mandrel wrapping
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maritime broadcast communications net
master frequency generator
master station