Load Sharing - Cabletron Systems 9C214-2 Installation Manual

The Power Supply Level Indicator LED indicates, by segment number, the
percentage of the power supply's capacity being used. The possible states and
descriptions of the Power Supply Level Indicator LED are listed in Table 3-3.
Segment
Number(s)
1 - 5
6 - 9
6 - 9
10
11

Load Sharing

Each 9C214-2 Power Supply uses a current sharing design. This design allows
multiple power supplies to equally (within ± 5%) share the output load. For
example, if two power supplies are used, each power supply provides 50% ± 5%
of the output load. This feature increases the life of each power supply.
Table 3-3. Power Supply Level Indicator LED
LED
Color
Green 0–49% of power load being
used.
Green 50-89% of power load being
used. No parallel power supply
operational.
Green/ 50-89% of power load being
Yellow used. Parallel supply(ies)
installed; however, yellow
indicates loss of redundancy.
Yellow Greater than 90% of power
supply being used.
Red Overload condition exists.
9C214-2 Power Supply Operation
State
No action necessary.
No action necessary.
Add an additional
power supply if
redundancy is
desired.
Add an additional
power supply for
redundancy.
Add an additional
power supply or
reduce number of
modules in the
chassis.
Description
3-5