Power Supply Modes; Fault-Tolerant Mode - 3Com 4007 Getting Started Manual

3com 4007: quick start
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See the documentation that is supplied with each
module to determine your module power
requirements. Take into account any modules that
you plan to install, as well as those that are already
installed.

Power Supply Modes

The Switch 4007 runs in either of two power supply
modes:

Fault-Tolerant Mode

Non-Fault Tolerant Mode
For optimal power redundancy in either power mode,
run the Switch 4007 with two power supplies.
Fault-Tolerant Mode
A user-selectable mode in which power that is
equivalent to one power supply is held in reserve. This
reserve power is not available to installed modules
until a power supply fails, or until you switch the
power mode from power fault-tolerant mode to
power non-fault-tolerant mode.
While the chassis is running in fault-tolerant mode:
All installed power supplies are functioning and
contributing power to the chassis and modules.
No single power supply is a dedicated standby
power supply.
Power Management
Rather, a factory-defined power limit (which is
based on the number of installed power supplies)
ensures that power that is equivalent to at least
one power supply is available to replace power
that is lost when a power supply fails.
The amount of power that installed modules in a
chassis require must not be greater than the
number of installed power supplies, minus one
(n-1). When you reserve power that is equivalent
to one power supply in power fault-tolerant mode,
the failure of a single power supply has no impact
on installed modules that are already powered on.
If a power supply fails while the switch is running in
power fault-tolerant mode:
EMEs respond by automatically disabling power
fault-tolerant mode.
Power formerly reserved (unavailable to installed
modules) is made available by power class and slot
location to power-enabled Switch 4007 modules
to prevent them from powering off (as an attempt
to bring power consumption under the
now-reduced power budget).
All modules that had power before the power
supply failure continue to receive power without
interruption.
Upon power supply recovery, the EME
automatically reenables power fault-tolerant
mode.
69

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