Nortel Passport 4430, Hardware Installation, Page: 23 / 176

Installing the Passport 4400 Passport 4400 Hardware Installation Manual
2-7
Connecting a DC Unit
The DC version of the Passport 4400 unit has an external terminal block located
on the back of the unit below the fan vents. A small black plastic door covers
the terminal points. To access the terminal points, gently pull off the plastic
door from the top with your finger.
The DC power source must be connected to the unit by attaching the +48 VDC,
-48 VDC, and the chassis ground cords to their respective terminal points located
on the block as shown below.
Figure 2-8. Location of DC Connection in Terminal Block
After the Passport 4400 unit is properly connected, you will have to verify that
it is operating properly.
Refer to Chapter 8, Indicators, for information on the indicator functions.
Refer to Chapter 11, Connecting a Workstation, for information concerning the
port connections on the Passport 4400 unit.
Warning:
!
Before applying power to the Passport 4400 unit, make sure that
the unit is properly grounded.
Warning:
!
The connector attaching the Passport 4400 unit to the DC power
source must have a single disconnect switch.
E
D
C
B
A
-4
8
+4
8
Ret
u
rn
C
h
a
ssi
s
+48 VDC (return)
-48 VDC
Chassis ground
Terminal block
Plastic door