Lucent Technologies 6.1 manual Unit Load Rules, Unit Loads for the Hybrid/PBX Mode

MERLIN LEGENDCommunications System Release 6.1			Issue 1
System Planning 555-661-112			August 1998
F Unit Load Calculation
	Unit Load Rules		Page F-2
	Unit Load Rules	F

A general rule to follow is that if you can distribute the DID modules and telephone modules equally across the carriers, you will prevent unnecessary drain on any one carrier.

Also, depending on the system’s mode, the rules vary. This section provides the rules for calculating unit loads for the different modes.

Unit Loads for the Hybrid/PBX Mode F

The 391A1 and 391A2 power supplies have a maximum rating of 54 unit loads and generally can support six modules of any type in a system in Hybrid/PBX mode  without exceeding the 54-unit maximum. If, however, both of the following conditions are true, the unit loads on a carrier might exceed the 54-unit maximum:

■All six carrier slots are occupied by MLX or analog multiline telephone modules

■The carrier has a total of more than 45 MLX-20L telephones or 34-button analog multiline telephones installed

The 391C1 and 391A3 power supplies have a maximum rating of 75 unit loads. If your system contains a 391A1 or 391A2 power supply module, and the unit loads for that carrier will exceed 54, a 391C1 power supply should be installed in the system.

Unit Loads for Key or Behind Switch Mode F

In a Key or Behind Switch system with four or fewer modules, no calculation is needed. The power supply generally supports four modules of any type in Key or Behind Switch mode.

Calculating Unit Loads F

Use the worksheet and instructions in the remainder of this appendix to calculate unit loads for each carrier. Make a copy of all pages of the worksheet for each carrier.