See Figure 20 on page 53.
Figure 20: DC Power Supply in an EX9214 Switch
Each power supply has two power inlets: one located at the top of the power supply and another that
requires a dedicated power feed, located directly above the power supply. If you plan to operate a
maximally congured DC-powered switch, we recommend that you use a dedicated customer site circuit
breaker rated for 208 A (104 A per supply) (–40 VDC) minimum, or one that complies with the by local
code.
If you plan to operate a DC-powered switch at less than the maximum conguraon, we recommend
that you provision a circuit breaker according to respecve Naonal Electrical Code and customer site
internal standards to maintain proper level of protecon for the current specied above or each DC
power supply rated for at least 125% of the connuous current that the system draws at –40 VDC.
DC Power Supply Conguraons
EX9214 switches support four DC power supplies, installed vercally at the rear of the chassis in slots
PEM0 through PEM3 (leî™› to right), in two zones: power supplies in slots PEM0 and PEM2 provide
power to the lower fan tray, line card slots 6 through 11, and SF slots 1 and 2; power supplies in slots
PEM1 and PEM3 provide power to the upper fan tray, line card slots 0 through 5, and SF slot 0. There
must be at least one power supply in each zone.
53
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