Northern Telecom DMS-100 Series Maintenance Procedure page 9

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3 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 prevent overloading. The termination on a loop
may consist of any combination of devices subject only to the
requirement that the sum of the Load Numbers of all the devices does
not exceed 100.
DMS VoiceMail Routine Maintenance Procedures SPM 02