Maintenance Manual

INSTALLATION AND MAINTENANCE MANUAL
Tsunami FAMILY
FAST ETHERNET WIRELESS BRIDGES
SEPTEMBER 1999
SECTION 3: INSTALLATION & ADJUSTMENTS PAGE 3-13
3.7.1 DC Power Wiring
Connect the power cable with adequate current rating (minimum of 20 AWG) to the terminals
shown on the removed (not plugged into the radio) DC power plug using the screw connections.
The recommended minimum current rating of external fuses and cables is 3 Amps. The Tsunami
radios consume less than 1 Amp at ±48V and less than 2 Amps at ±24V. Be sure the DC power
cable is less than 3 meters (9.75 feet) in length.
Each Tsunami terminal should be externally fused separately
with a 5 Amp maximum fuse. The DC power cable must be
less than three (3) meters in length.
If using negative power, connect the negative voltage to pins 1 or 6. Connect the ground return
connection to pins 3 or 4. See Figure 3-3.
If using positive power, connect the positive voltage to pins 3 or 4. Connect the ground return
connection to pins 1 or 6. See Figure 3-4.
The ground connection is available at pins 2 and 5. Either pin may be used to ground the return
side of the power supply. Do not ground both sides of the power supply.
Proper grounding, either through the chassis and/or the power
supply, can be very important for protection from lightning. A
grounding screw hole is provided on the rear panel.
The ground connection may be left floating if the power supply
is referenced to ground externally and to avoid ground loops in
some configurations. However, this may not provide adequate
grounding for lightning protection.
Use a DVM (digital voltmeter) to verify voltage and polarity on the DC power plug.
Do not connect the DC power plug to the rear of the Tsunami
terminal until a load is connected to the antenna port (either an
RF pad, or an RF cable and antenna).