Installing The Basic Carrier - Lucent Technologies MERLIN LEGEND Release 5.0 Installation Manual

MERLIN LEGEND Communications System Release 5.0
Installation 555-650-140
Installing the Control Unit

Installing the Basic Carrier

Unit Loads for Hybrid/PBX Mode
Older power supplies (models 391A1 or 391A2) generally support six modules
of any type in Hybrid/PBX mode, without requiring an upgrade to a newer power
supply (model 391A3). If the following conditions are true, however, the unit
loads on a carrier can exceed the 54-unit maximum and, therefore, require a
newer power supply (model 391A3):
All six carrier slots are occupied by MLX telephone or analog multiline
telephone modules.
The carrier has a total of more than 45 MLX-20L telephones or
34-button analog multiline telephones installed.
Unit Loads for Key or Behind Switch Mode
In a Key or Behind Switch system with four or fewer modules, no calculation is
needed. The older power supplies (models 391A1 or 391A2) generally support
four modules of any type. With more than four modules, a newer power supply
(model 391A3) may be needed.
Installing the Basic Carrier
Continue with this procedure only if you have met all of the requirements
discussed earlier in this chapter.
NOTE:
When you mount the basic carrier onto the backboard, leave 29 in. (73.66
cm) of backboard to the right. This allows you to easily install and remove
the control unit cover, and also allows enough room for system expansion
to the right for a total length of up to three carriers.
Issue 1
June 1997
Page 2-18