MB21 (21 Slot) Chassis
F-MB21B-R
MB6 and MB21 Multichannel Chassis Installation Guide, v2.0, Issue 01
17
The F-MB21X-R has two PSUs (Power Supply Units) 600W each, with a fully redundant power supply with hot-
swap and hot-plug ability. Each PSU module can support the maximum load. If both PSU modules are present, they
share the load (default configuration).
The F-MB21X-R chassis is designed to tolerate the loss of one AC supply (120/240V) source without loss of installed
card functionality. Since there are two power inlets on the F-MB21X-R chassis, the cards in the chassis can operate
with only one powered.
F-MB21B-R
The 7-inch rack unit (4 RU) F-MB21B-R chassis holds any combination of up to 21 Makito
X,
classic
Makito,
Barra-
cuda, and Torpedo mini-blades.
Figure 12: F-MB21B-R Chassis Rear View
Each socket on the PDU (Power Distribution Unit) powers a pair of PSUs (Power Supply Units). Two PSUs are suffi-
cient to power a fully loaded chassis.
The F-MB21B-R chassis is designed to tolerate the following without loss of installed card functionality:
•
The loss of one AC supply (120/240V) source.
Since there are two power inlets on the F-MB21B-R chassis, the cards in the chassis can operate with only one
powered; however, the chassis would not be fully redundant.
•
The loss of one or two PSUs of the four PSUs in the F-MB21B-R chassis in any combination.
The following replacement part is available for the power supply (#P-MB21B-PS).
PSU Power On/Off Switches
AC Power
PSU Alarm LED (red)
PSU Alarm Reset
Receptacles
PSU Status LED
(green)
button