User's Manual

Table Of Contents
EXCELMAX ACCESS POINT CELL INSTALLATION AND MAINTENANCE GUIDE VERSION 1.4
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3.9.2 DC PSU/NIA Option
The DC PSU/NIA unit powers the ExcelMax Access Point from a -48V DC power source, typically
a battery back-up supply. The ExcelMax DC PSU/NIA units (020-44109-0802; see Appendix B:)
are black, and output an isolated supply of +53.5V.
The DC PSU/NIA has an input power connector at o
ne end, and is supplied with the mating plug,
which has 3 screw terminals on it for easy installation. The two supply wires and Earth/Ground are
connected here. The Power Input LED is green when the power connection is wired correctly, but
red if the polarity is reversed. It is off when there is no power.
The DC PSU/NIA has two RJ45 connectors at the
other end. One is for the LAN Ethernet
connection. The other is a Power-Over-Ethernet type connection, supplying power and data to the
ExcelMAX Access Point. The Current Sense LED is green when the Access Point is on and
drawing minimum specified current (approximately 0.2A or more).
Warning
ExcelMAX Access Points can only be powered by the ExcelMax version of the DC
PSU/NIA. The Ac
cess Point will be permanently damaged if used with another
version of the DC PSU/NIA. The DC PSU/NIA unit contains no serviceable parts.
Warning
The DC PSU/NIA unit is designed for indoor use only. The body of the unit is used
as
a heat sink, and will get very warm.