Compaq Armada 7400 Reference Manual page 167

Users should ensure for their own protection that the electrical
ground connections of the power utility, telephone lines, and
internal metallic water pipe system, if present, are connected
together. This precaution may be particularly important in rural
areas.
The Load Number (LN) assigned to each terminal device denotes
the percentage of the total load to be connected to a terminal loop
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. An alphabetic suffix is also
specified in the Load Number for the appropriate ringing type (A
or B), if applicable. For example, LN = 20 A designates a Load
Number of 20 and an "A" type ringer.
The Load Number for this device is 5B.
For the location of the authorized Canadian maintenance facility
nearest you, call 1-800-263-5868 or contact:
Compaq Canada, Inc.
45 Vogell Road
Richmond Hill, Ontario LA5B 3P6