Base Station Powering - Nortel Meridian Companion Installation And Maintenance Manual

Base Station Powering

P0725810 Issue 3.0
The Remote Power Interconnect unit (RPI) allows Companion Base
Stations to be powered over the same type of cables that carry the
TCM signals. You can also power a Base Station locally with a plug-
top power supply but a plug-top power supply requires an ac outlet
within 4 meters (wiring length) of the Base Station.
Each RPI output connector provides power for one Base Station
using one or two pairs of wires (power pairs).
Note: The RPI also provides pass-through connectivity for the
TCM signal. The TCM wires (TCM pair) from the
Controller connects to an RPI input connector, and is routed
to the appropriate output connector.
It is usually cheaper and more convenient to install RPIs than to
provide ac outlets and plug-top power supplies for each Base
Station. Using RPIs also makes it easier to add or move Base
Stations if the system configuration changes. Usually, you should
install RPIs in a location other than where the COMPANION
Controller and Modules are to prevent power management and
ventilation problems. The maximum input power requirement of
the RPI is 240 W ac, or 135 W if the unit is being powered by a
48 v dc source.
Note: To enhance the integrity of the system in cases where there
is more than one Base Station in a cell, you may connect the
Base Stations in that cell to different RPIs.
You should power Base Stations with RPIs in all but the following
circumstances:
• When Base Stations are in a separate building from the
Controller, and it is not cost effective to install RPIs with these
Base Stations.
• When the two-way cable dc loop resistance (including
interconnections) between a Base Station and its RPI exceeds 90
ohms (for example, more than 500 meters [one way] for one pair
of 0.6 mm wires)
COMPANION 200 Installation and Maintenance Guide
Preparing for the installation 22