Alcatel 7750 SR-12, Руководство по установке

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Appendix B: Field Replaceable Units
7750 SR-12
Page 143
AC P
OWER
S
HELVES AND
R
ECTIFIERS
If your 7750 SR-12 router operates with redundant AC power rectifiers, you can remove and
replace a unit without affecting system operation. In a system with redundant rectifiers, a single
rectifier can be removed without interrupting operations as long as the other rectifier(s) are
operating correctly and providing adequate power.
A rectifier is operating properly when the AC OK and DC OK LEDs are both lit green. A rectifier
must be replaced when the Fault LED is lit red.
Follow the manufacturer’s instructions if it is necessary to remove an AC rectifier or power shelf
from the rack.
D
ISCONNECTING
AC P
OWER
C
ABLES
AC power shelf cables are connected directly to a DC PEM. One set of power cables (VDC and
RTN) from the AC power shelf connects to a single DC PEM. A maximum of two AC power
shelves can connect to an 7750 SR-12 chassis with two DC PEMs installed. When power to an AC
power shelf is shut off, then power is also terminated to the DC PEM. See
Figure 48 .