main distribution frame

In telecommunication, a main distribution frame (MDF) is a distribution frame on one part of which the external trunk cables entering a facility terminate, and on another part of which the internal user subscriber lines and trunk cabling to any intermediate distribution frames terminate. The MDF is used to cross-connect any outside line with any desired terminal of the multiple cabling or any other outside line. The MDF usually holds central office protective devices and functions as a test point between a line and the office. The MDF in a private exchange performs functions similar to those performed by the MDF in a central office. Synonym (in telephony) main frame. Source: from Federal Standard 1037C and from MIL-STD-188

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line code
network repeaters
link
link level
link quality analysis
load
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 back
loop gain
low performance equipment

low power communication device
machine readable medium
magneto ionic double refraction
magneto optic effect
main lobe
main storage
maintainability
maintenance
managed object
manchester code
mandrel wrapping

margin
maritime broadcast communications net
master frequency generator
master station
material scattering
maximal ratio combiner
maximum usable frequency
maximum user signaling rate
mean time between failures
mean time between outages
mechanically induced modulation