Juniper NETSCREEN-ISG 2000, Руководство пользователя, Страница: 46 / 114

Chapter 4 Servicing the Device
40 User’s Guide
4. Screw in the thumbscrews on each side of the interface module.
I
NSTALLING
P
OWER
S
UPPLIES
Although the NetScreen-ISG 2000 can run with one power supply, it is advisable to install
two. Two power supplies minimize the chance of a system failure due to a failure in one of
the individual power supplies. Do not mix power supplies.
Wiring the DC Power Supplies
To connect DC power feeds to the terminal blocks:
1. Loosen the retaining screws on each terminal block.
2. Insert the 0V DC (positive voltage) return wire into the center COM connector
and the -48V DC power feed wire into either the left or right connector.
Important: If you push the latch before it contacts the ridge on the bay wall, the
locking tab clicks into place prematurely and you will not be able to seat the
interface module properly.
Warning: You must shut off any current to the DC feed wires before connecting the wires
to the power supplies. Make sure that the ON/OFF power supply switches are in the
off position.