ADTRAN 1203019L2 User Manual page 8

The Load Number (LN) assigned to each terminal device
denotes the percentage of the total load to be connected
to a telephone loop which is used by the device, to pre-
vent overloading. The termination on a loop may consist
of any combination of devices subject only to the require-
ment that the total of the Load Numbers of all devices
does not exceed 100.
viii NT1 ACE User Manual 61203019L1-1