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Ground Resistance:
The resistance between the subscriber protector
ground and C.O. ground.
Line Loss (Circuit Loss):
Measurement of power loss in dBm, measured with
flat weighting over the voice frequency band.
Loading, Cable:
Adding inductance (load coils) at specific intervals
along a cable to reduce distortion and improve
frequency response, compensating for
transmission-degrading distributed capacitance
between conductors.
Loop Current:
Current in mA required to operate C.O. equipment
and station apparatus at the subscriber premises.
Loop Treatment (REG., DLL, etc.):
This is C.O. extension equipment placed on a pair to
overcome excessive line loss.
Loss:
Decrease in power (dB) of a transmitted signal.
Maintenance Test Unit (M.T.U.):
Device at protector that allows tester to isolate
trouble to premise wiring.
Noise:
Signal producing undesirable sound on telephone
line, caused by impedance discontinuities, crosstalk,
or other interference.
Noise Metallic (Nm):
Noise measured across the tip and ring of a circuit
that the customer actually hears on the line. The
same as circuit noise, measured in units of dBrnC.
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