Allied Telesis AT-MMCR18, Installation Manual

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Chapter 1: Overview
9
Rear Panels
Figure 3 shows the back panels of the chassis with one AC or DC power
supply unit installed. The chassis is not shipped with a power supply unit.
You must install at least one AC or DC power supply unit.
Note
You must purchase the AT-MMCR-PWR-AC or AT-MMCR-PWR-DC
power supply units separately.
Figure 3. Back Panels
Auxiliary Power
Supply Slot
You must purchase and install the AT-MMCR-PWR-A or
AT-MMCR-PWR-DC power supply unit in the PSU1 slot to use the AT-
MMCR18 chassis. The PSU2 slot is for an auxiliary power supply. You can
purchase two power supply units and install one in the PSU1 slot and the
other in the PSU2 slot.
Note
You can install two AC power supply units, two DC power supply
units, or the combination of one AC and one DC power supply units
in the same chassis.
If one power supply fails, the LED of the corresponding power supply unit
on the front panel goes out and the entire power load is shifted to the other
power supply unit. The power supplies are hot-swappable.
Power Supply Slot A
Auxiliary Power Supply Slot B
AC Model
DC Model
Power Supply Slot A
Auxiliary Power Supply Slot B