Juniper G10 CMTS, Руководство по оборудованию

Страница: 42 / 210

Chassis
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
JUNOSg 3.0 G10 CMTS Hardware Guide 26
Power Supplies
Power supplies are available in either AC or DC input voltage models. You must specify a
model when ordering a G10 CMTS. The power supplies and the chassis are mechanically
keyed to ensure that the same types are used together.
If you order an AC version of the CMTS without power redundancy, the CMTS ships with five
AC power supplies installed in domain A. If you order the CMTS with power redundancy, the
CMTS ships with 10 AC power supplies installed. DC versions of the CMTS are always shipped
with 10 DC power supplies installed.
Power redundancy provides input power redundancy as well as N+1 power supply
redundancy. You must supply power from different circuits to domain A and domain B for
power redundancy protection. However, the VDC outputs of each power supply are available
to all chassis modules through the power bus in the midplane.
An AC power supply front panel is shown in Figure 11 on page 27. The power supplies are in
a standard 3 U housing with a 160 mm depth and a 40 mm front panel width. The power
supplies install from the front of the chassis (see Figure 4 on page 11) and plug into the PS1
through PS10 connectors on the midplane (see Figure 9 on page 23). Power supplies are
hot-swappable.
Since a power supply is half the depth of the other modules in the front of the card cage, the
power supplies sit recessed in the chassis bay. A removable faceplate installs over the front
opening.
The power supply front panel contains two indicator LEDs— POWER and FAULT . Table 6 on
page 26 explains the significance of these LEDs.
Table 6: Power Supply LEDs
If the power supply is operating in a degraded mode due to an increase in its temperature, a
warning event is generated (if enabled). If the temperature rises to the over-temperature
shutdown limit, the
FAULT LED is illuminated and a critical event is generated (if enabled).
Temperatures above the over-temperature shutdown limit cause the power supply to shut
down. See the
JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and
Routing Protocols for more information on event configuration.
POWER FAULT Meaning
Green Not illuminated Normal operation
Green Red
!
Over-temperature
!
Over-current or over power
limit condition
Not illuminated Red Voltage input failure
Not illuminated Not illuminated
!
Power supply not installed
correctly
!
No input power and no DC
output from other power
supplies to illuminate
FAULT
LED