Owner`s manual

5–4 DEChub 900 MultiSwitch Owner’s Manual
Power System Monitoring
The DEChub 900 MultiSwitch hub power system is monitored by the Hub Manager.
When changes are detected in the hub power system, the Hub Manager updates the
amount of power available to the network modules. An increase in available power
can result in the powering up of previously unpowered network modules. A decrease
in available power may result in powering down full-height network modules to keep
the power system within its operating limits.
Half-height network modules are immediately powered up when inserted into the
hub. This allows for forward compatibility for all DEChub 90 network modules, and
provides exact DEChub 90 operation in the DEChub 900 MultiSwitch hub.
Hub Status Display Power Messages
The Hub Manager monitors the power system and displays four types of power sys-
tem messages in the Hub Status Display. These messages let you know the current
power status, whether or not you have N+1 redundancy, and how much power is
available to allocate to additional network modules.
In addition to the four power system messages, a power-related message may
appear during the ”Available Slots” Hub Status Display time. This message displays
either the status of all the available slots in the hub, or a ”!No More Power!” message.
In most situations, when the ”!No More Power!” message is displayed, the current
power supply(s) cannot provide power to any empty slots without interrupting other
slots. Refer to Table 3–3 for a full description of Hub Status Display messages.
Power Allocation
The power system allocates power to the chassis and the network modules on a
priority basis. The order of priority is:
• The chassis, including the Hub Manager, receives 15 watts of power.
• All half-height network modules installed in the chassis receive power
immediately at power up.
• Available power is allocated to full-height modules from right (slot 8) to left
(slot 1).