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NOTE: Werecommend that you install two SRE modules for redundancy. If you install
onlyone SREmodule,werecommendthatyouinstallitin theslotSRE0.See“Installing
an SRE Module in an EX8208 Switch” on page 155.
Slot SF accepts only the SF module. See “Switch Fabric (SF) Module in an EX8208
Switch”onpage28.AnEX8208switchcanhaveeitherzeroSFmodulesoroneSFmodule
based on your switch configuration. The SF module is keyed so that it does not fit in any
other slotin the chassis.See“Installing an SF Modulein an EX8208 Switch”on page157.
Slot Numbering for the Power Supply Slots
The chassis has six vertical slots on its front bottom. Youcan install up to six power
supplies (either all AC or all DC) in these slots, which are labeled PSU 0 through PSU 5
(from left to right). Table 6 on page 15 lists the slot numbers for the power supplies on
an EX8208 switch. See “AC Power Supply in an EX8200 Switch” on page 40 and “DC
Power Supply in an EX8200 Switch” on page 48.
CAUTION: Mixingdifferenttypesofpowersuppliesinthesamechassisisnotasupported
configuration.
Table 6: Slot Numbering for Power Supply Slots on an EX8208 Switch Chassis Front
ComponentsAcceptedin SlotSlotLabel
PowersupplyPSU0
PowersupplyPSU1
PowersupplyPSU2
PowersupplyPSU3
PowersupplyPSU4
PowersupplyPSU5
Figure 4 on page 16 shows the slot numbering for the power supply slots in an EX8208
switch.
15Copyright©2010, JuniperNetworks, Inc.
Chapter1:EX8208 SwitchOverview