Juniper ERX - RELEASE 11.1.X HARDWARE GUIDE 03-23-2010 Hardware Manual page 24

ERX 11.1.x Hardware Guide
Figure 5: ERX310 Router, Front View (AC Model)
NOTE: The DC model has blank filler panels in power supply slots.
Figure 6: ERX310 Router, Rear View (AC Model)
Figure 7: ERX310 Router, Rear View (DC Model)
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ERX Routers