Lucent Technologies MERLIN LEGEND Release 6.1 Pocket Reference

MERLIN LEGEND Communications System Release 6.1
Pocket Reference
555-661-116
Issue 1
August 1998
Page 90
Power Supply Unit Load Requirements
Power Supply Unit Load Requirements
Unit Load Calculation Rules
* The 391A1 and 391A2 power supply units generally support 6 modules
of any type in Hybrid/PBX mode. However, if all 6 carrier slots meet the
following conditions, the unit load total may exceed 54:
■ Only MLX or analog multiline station modules are installed.
■ More than 45 MLX-20L or 34-button analog multiline telephones are
installed.
The 391C1 and 391A3 power supplies have a maximum rating of 75
unit loads. Use these power supplies in place of a 391A1 or 391A2 on
systems where unit loads will exceed 54.
† The 391A1 power supply unit generally supports 4 modules of any type in
Square Key mode.
Mode
Installed
Modules
Calculation
Hybrid/PBX,
Modified Key,
or
Behind Switch
6*
Not required
Square Key
or
Behind Switch
4 or fewer†
Not required
Square Key
or
Behind Switch
5 or more Use the “Unit Load Rating of Sys-
tem Modules” table and instructions
below to determine the estimated
unit loads (ULs):
■ If the ULs < 75 and the 391C1
or 391A3 power supply is used,
then no calculation is required.
If a 391A1 or 391A2 power
supply is used and the
ULs > 54, then replace the
power supply with a 391C1
power supply.
■ If ULs > 75, reconfigure the
system so that the total ULs
does not exceed 75 per carrier.
For more information on unit load
calculation, refer to Appendix F of
System Planning .

Lucent Technologies MERLIN LEGEND Release 6.1 Specifications

General

Brand	Lucent Technologies
Model	MERLIN LEGEND Release 6.1
Category	Conference System
Language	English