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MERLIN LEGEND Communications System Release 6.0
System Manager’s Guide
555-660-118
Issue 1
February 1998
System Components
Page 3-47Power-Related Hardware
3
Power Accessories 3
In a power failure, battery backup units can keep the system running for several
hours. When you connect adjuncts and adapters to telephones, the power
requirements for the telephones and the system increase. Sometimes it is
necessary to add a power accessory, described in this section, to an individual
telephone or to the system to accommodate these additional needs.
System Auxiliary Power 3
When your system is installed, when you change the system operating mode, or
when you expand your system, a Lucent Technologies technician calculates the
unit load
on your system and determines your overall power needs. A unit load is
a measure of power used to determine the electrical load that the following
components have on each carrier’s power supply:
■ Telephones and adjuncts
■ 800 DID modules
Only the telephones and adjuncts that connect to the analog and MLX extension
jacks on the control unit require unit load calculation, not equipment that has its
own power supply (for example, a fax machine, an MFM, or an answering
machine). If, after a system is changed, additional power is required for the control
unit, your Lucent Technologies representative sees that an auxiliary power unit is
installed.
NOTE:
Some system power supplies limit the number of 100D modules and 800
NI-BRI modules (Release 4.0 and later systems only) installed in a carrier.
A newer power supply, the 391A3, eliminates the restriction. Consult your
Lucent Technologies representative for details.
Battery Backup Power 3
An Uninterruptible Power Supply (UPS) unit can provide battery backup for power
to the system. Basic UPS provides power for 15 minutes; however, you can add
reserve UPS units to basic UPS. Each reserve unit extends backup power for an
additional hour.
Telephone Power Units 3
The KS22911-L1 and 329A power units provide additional power to MLX or
analog multiline telephones that have adjuncts, adapters, or two DSSs attached
(MLX telephones only), or to telephones located far from the control unit.
These power units are installed between the telephone and the wall jack. Adding
local power to a few telephones can reduce system load.