User's Manual

Exalt Communications Inc.
EX-2.4i Installation and Maintenance Manual
Page 17
MAN-002400, Revision 001
2005-12-01
can be significant. In some cases, there can also be a risk to human life by not protecting against
lightning entering a building through wiring or improper grounding. If you do not have
experience in this type of installation practice, it is strongly suggested that a qualified electrician
and/or telecoms professional is consulted during the installation of the equipment and wiring.
4.2.3 DC Power
The device accepts direct DC power within the voltage specifications stated (48 Volts, nominal)
and with enough current delivery capacity, also per the specifications stated. The DC power may
be connected as a positive or negative voltage supply, and may be referenced to ground or may
be ‘floating’ (differential voltage). There are different system grounding considerations
depending on the nature of the DC supply grounding, and your qualified electrician or telecoms
professional should be consulted on the proper wiring and grounding process.
To connect a DC source, with the power disabled on the DC supply, connect proper gauge wiring
to your DC supply. For most (short) power cable runs, 18awg or 24awg wire can be typically
used. Strip the ends just long enough for enclosure to the DC radio connector, approximately
0.25 inches (6mm). If using stranded wire, the stripped ends that will be inserted into the DC
terminal connector should be solder-tipped. If using solid wire, a solder-tip is not necessary.
Make sure that the power wiring is long enough to neatly traverse, when properly dressed,
between the supply and the radio mounting location. If DC wires will be exposed to outdoor
environments, use wire that is in a proper weather-proof wiring jacket. For longer runs of DC
wiring, you may need to use higher gauge wire and/or a higher current source supply to
overcome the additional resistance of the DC wiring. However, the DC connector for the radio
may not be able to accept a very high diameter wire, so you may need to transition to thinner
gauge, if necessary, near the end of the wiring run, or simply use the maximum diameter wire for
the entire wiring run, so long as it meets the powering requirements considering the total
resistance of the wiring and the power source current load capacity.
Insert the wiring ends into the DC mating connector (supplied). The mating connector should
NOT be connected to the radio system, and the power system should be disabled. Pay close
attention to the polarization of the DC signals coming from the DC supply and the ground
conductor (if any), and ensure that you have connected them to the proper pins of the DC mating
connector. The connector mate on the radio is clearly marked for proper polarization and for
ground connection.
It is recommended that you wire across the plus (+) and minus (-) terminals from the DC supply,
and place a separate jumper between the proper terminal and the ground terminal if you wish to
reference one side of the power supply line to the radio chassis ground. In most cases, your DC
system would be floating and this is not necessary, but some configurations may require one side
to be grounded for proper electrical safety.
Consult a qualified electrician if you are uncertain about how to properly ground
the system and connect power.
!