Figure - Sun Microsystems Sun Fire E6900 Site Planning Manual

up with an on-line UPS. The power sources are not independent if they are only
distinguished by having separate circuit breakers. One RTS hooked to an AC power
source and the second RTS hooked to a UPS that is connected to the same AC power
source is not supported because when the UPS is by-passed for maintenance both
RTSs will be hooked up to the same source. If both RTSs are hooked to one utility
feed then both lines must be backed up with on-line UPSs to ensure input power
redundancy.
In configurations with two RTU assemblies and two independent AC power
■
source there will be four cables to connect, two on the front, and two on the rear
of the system (
To power source A
To power source B

FIGURE 3-1

In configurations with one RTU assembly and two independent AC power
■
sources there will be two cables to connect, both in the rear of the system
(
FIGURE 3-2
FIGURE 3-2
3-4 Sun Fire E6900/E4900 Systems Site Planning Guide • May 2006
).
FIGURE 3-1
RTS 0
default
RTS 1
alternate
Front
Sun Fire E6900 Configuration: Two RTU Assemblies and Two Independent
AC Power Source
).
Front Front
Sun Fire Cabinet for E4900 Configuration:
Independent AC Power Sources
RTS 1
alternate
RTS 0
default
Rear
To power source B
RTS 1 RTS 1
alternate alternate
RTS 0 RTS 0
To power source A
default default
Rear Rear
One RTU Assembly and Two
To power source A
To power source B