Telephone Power Units; In-Range Out-Of-Building Protection - AT&T MERLIN LEGEND Release 3.1 System Manager's Manual

Power-Related Hardware
Battery Backup Power
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

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.
Protection Accessories
This section describes accessories that are needed for grounding and
protecting special telephone connections from power surges, electromagnetic
interference, and electrostatic discharge.

In-Range Out-of-Building Protection

Your AT&T representative orders an In-Range Out-of-Building (IROB) protection
unit when equipment is connected to the following jacks and is located in a
different building but within 1000 feet (305 m) of the control unit:
Analog multiline telephone extension jacks on 008, 408, and 408 GS/LS
modules
MLX telephone extension jacks on 008 MLX or 408 GS/LS-MLX modules
These units protect the equipment and the control unit from lightning strikes and
power surges. Each piece of equipment requires two units, one for the control
unit end of the wire run, the other for the equipment end.
!
CAUTION:
The IROB protectors must be installed by a qualified service technician or
installer.
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System Components