HP Officejet 300 All-in-One Printer - Manual (Page 124)



The Load Number (LN) assigned to each terminal device denotes the
percentage of the total load to be connected to a telephone loop or
circuit which is used by the device to prevent overloading. The
termination on a loop may consist of any combination of devices
subject only to the requirement that the total of the load numbers of
all devices does not exceed 100.