NV8500 family Digital Routers • User’s Guide 3
1. Introduction
Power Supply
Power Supply
Power for the NV8500 family routers frames is supplied through the Miranda PS8100 power sup-
ply module. The module is either installed in the router frame (the NV8144) or installed in an exter-
nal, separate frame, the NV8000. The NV8000 can house up to 4 modules. Each PS8100 module
produces 850 Watts.
The number and type of power supply modules required, and if and how many NV8000 power sup-
ply frames are required, depends on which and how many routers are being used. For redundancy,
additional (optional) power supply modules can be installed as a backup power source should the
primary module fail. For a list of power requirements, see Connecting to Power
on page 85.
The PS8100 power supply module accepts a wide range of AC input voltages and produces five
+48 VDC outputs. The power supply automatically senses the AC input voltage range (90–130 and
180–250 VAC) and adjusts to maintain a relatively constant DC output; no voltage selection is
required.
The five regulated outputs are directed to modules in the router where on-board regulators produce
the DC voltages required by the local circuits. Each output powers one of the five green LEDs and
output test points located on the front of the PS8100 power supply module. Under normal opera-
tion, all five LEDs are lit. For more information on LEDs, see Indicator LEDs
on page 101.
Figure 1-1 shows the PS8100 power supply module architecture.
Figure 1-1. PS8100 Power Supply Module Diagram
For information on making power supply connections, see Connecting to Power on page 85.
The PS8100 power supply module, and the NCV8000 power supply frame, have no serviceable
fuses.
Cooling is provided by a single low-speed fan located along the front edge of each PS8100 power
supply module, which draws a small quantity of air across the internal heat sinks.
Power Sense
and Limiting
AC Input, Fuse,
Rectifiers, and Filter
Power Factor
Correction
+48VDC
Regulators (×5)
+48VDC
Out (×5)
90130 VAC or
180250VAC In
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