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Brocade VDX 8770-4 QuickStart Guide 11 of 32
Publication Number: 53-1002554-01
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CAUTION
For the DC input circuit to the system of a Brocade VDX 8770-4 (3000W power supply), make sure there
is an 80 Amp circuit breaker, minimum -48 VDC, double pole, on the input lugs to the power supply. The
input wiring for the connection to the switch should be copper wire, 2 American Wire Guage (AWG),
marked VW-1, and rated minimum 90°C.
The power requirements for a given switch configuration depend on which modules have been installed in the
switch. Table 3 shows the power consumption for the modules that can be used in the Brocade VDX 8770-4 switch
along with the power consumption for the cooling fans.
All numbers for the line cards assume that the card is fully populated with optical transceivers, including QSFPs for
the 12x40 GbE line cards. All ports are Ethernet.
You can calculate your power requirements by combining the power demands for the various modules and fan units
in your configuration. While you may use fewer ports in a given line card, it is always safer to use the power
requirement of a fully populated card.
TABLE 2 Power specifications
Specification Value for 3000W AC power supply Value for 3000W DC power supply
Input rating 16A 70A
Input voltage 200–240 VAC, 50-60 Hz, 16.0 Amp
maximum
-48 VDC
Operating range 180 ot 264 VAC -40 to -60 VDC
Inrush current Limited to 60 Amp peak for any initial
current surge or spike of 10 ms or less at
either cold or warm start. Any additional
inrush current surges or spikes in the form
of AC cycles or multiple AC cycles greater
than 10 ms and less than 150 ms, must not
exceed 25 Amp peak.
Limited to 70 Amp peak for any initial
current surge or spike of 10 ms or less at
either cold or warm start.
Output 12 VDC, 245 Amps 12 VDC, 245 Amps
TABLE 3 Power demands per component
Module or fan units Power demand at idle -
blades enabled, no
optics, ports disabled
(Watts)
Nominal power demand -
blades enabled, optics, 50%
line rate, random packets
(Watts)
Maximum power demand - blades
enabled, optics, traffic present, full line
rate, 64 byte smallest packet, 40°C
ambient temp., maximum power for all
supported optics (Watts)
Management module 46 46 50
Switch fabric module 120 120 132
48x1G line card 245 310 460
48x10G line card 245 310 460
12x40G line card 247 290 440
Fan unit 25 25 268