Apple GeoPort Telecom Adapter Kit - Manual (Page 106)

WARNING Users should not attempt to make such connections
themselves, but should contact the appropriate electric inspection
authority or electrician.
m Load number: 15
The load number (LN) assigned to each terminal device denotes
the percentage of the total load to be connected to the telephone
loop that is used by the device, to prevent overloading. The
termination of a loop may consist of any combination of devices,
subject only to the requirement that the sum of the load numbers
of all devices does not exceed 100.
m Telephone jack type: CA-11
xiii Communications Regulation Information