Feed-Level Redundancy; Circuit Breaker-Level Redundancy; Power Supply-Level Redundancy - Fortinet FortiSwitch-1000 Install Manual

Each power supply shipped with the FortiSwitch-1000 provides a maximum of 850 W DC power.
To calculate the power draw and circuit breaker requirements for the switch as a whole, limit the
AC current per power supply to 8A for 100-180VAC and 5A for 200-240VAC.
3.4.1.1 Peak Input AC Current per Power Supply
At 120 V AC: 12 A
At 240 V AC: 6 A

3.4.2 Feed-Level Redundancy

For the highest level of power redundancy, the switch must be connected to two independent
sources of AC power. In addition to the primary AC power source, this requires a second feed
from a different power substation or an in-house generator or other grid-independent source of
dependable AC power. Connecting three 850W power supplies to each of the two independent
AC feeds (attached to separate circuit breakers) can provide feed-level redundancy for a subset
of possible switch configurations (those for which N=3 or below – consult "Power Supply-Level
Redundancy" below).

3.4.3 Circuit Breaker-Level Redundancy

If feed-level redundancy is impossible or unnecessary for your installation, Fortinet recommends
establishing circuit breaker-level redundancy by putting each pair of power supplies on a separate
circuit-breaker. For configurations where N=4 or below, this allows six power supplies to provide
uninterrupted power to the switch in the event that a single power cord is disconnected or a single
circuit-breaker is tripped.

3.4.4 Power Supply-Level Redundancy

The minimum recommended level of redundancy is provided by ensuring the presence of N+1
power supplies as detailed in the chart below. Assuming constant AC power from the power strip,
this provides uninterrupted power to the switch in the event that a single power supply fails.
The following chart shows the maximum number of line cards supported by various numbers of
power supplies. Recommended minimum power supply configuration is N+1, where N is equal to
the minimum number of power supply units required to power the chassis for a given
configuration.
850 W Power
Supplies Required
N=1
N=2
N=3
N=4
Maximum Number of Line Cards Supported
CX4 Line Cards CX4 Line
Using Passive Cards Using
Cables Active Cables
0
4
10
12
– 15 –
XFP Line
Cards, SR
Modules
0 0
3 3
7 7
12 11
XFP Line
Cards, LR
Modules
0
3
6
10