Figure 3. Shelf Power Connection; Figure 4. Ac/Dc Transformer Connection; Figure 5. Power Supply/Rectifier Connection - ADTRAN DS3 NIU3 PM Installation And Maintenance Practice

CAUTION
Be careful to connect supply and return
terminals in the described configurations.
Make the following terminal connections:
• Connect the –48 V or ±24 V supply to
• Connect the associated return wire to
• If redundant power is intended, make similar
connections to
PWR B
A diode arrangement adds reliability by allowing both
DC supplies to load-share with one side picking up the
entire load if the other side fails.
A SUPPLY
A RETURN
B SUPPLY
B RETURN
FRAME
GROUND

Figure 3. Shelf Power Connection

Independent Power Supplies
Two optional independent power supply units are
available.
• AC/DC transformer (P/N 1212074L1) providing
48 VDC at 200 mA. Output terminals are stripped
and tinned wires.
• Power supply/rectifier (P/N 1212080L1) providing
–54 VDC at 2 amps. Output terminals are ring lugs
sized for the shelf input terminals.
Both units plug into a standard 120 VAC outlet.
AC/DC Transformer
The 200 mA AC/DC transformer is specifically
intended for use with the standalone housing (P/N
1212070L1). For the AC/DC transformer, the (red)
power wire is connected to the RET terminal and the
(black) return wire to the PWR terminal. The green wire
connects to the Frame Ground terminal (see
4
PWR A.
.
RET A
and .
RET B
TB1
PWR A
RET A
PWR B
RET B
Figure 4).
Issue 5, February 2011
48V
200mA
BLK
RED
GRN

Figure 4. AC/DC Transformer Connection

Power Supply/Rectifier
For the 2.0 amp power supply/rectifier unit
the output wire on the PS/R terminates in a modular
connector. An extension wire with a matching
connector is included. The extension wire has ring
terminals on the far end for connection to the NIU3
power terminals.
The red wire is –54 VDC and connects to the
terminal; the black wire is the return and connects to the
terminal; the green wire connects to FGND.
RET A
NOTE
The power supply/rectifier unit is a negative
output device; therefore, red and black wires
connect opposite of the AC/DC transformer
wires.
-54V
2.0 A
RED
BLK
GRN

Figure 5. Power Supply/Rectifier Connection

TB1
PWR A
RET A
PWR B
RET B
(Figure
PWR A
TB1
PWR A
RET A
PWR B
RET B
61213075L2-5E
5),