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Introduction - Page 7
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Glossary of Symmetra
TM
Terms
Extended Run Battery Frame - An accessory that increases the battery capacity of a system. Multiple
Extended Run frames can be connected to a single Symmetra
TM
to significantly increase run time.
Hot-Swappable - Modules are “hot-swappable” when they can be replaced safely while the load equipment is
still powered and the Symmetra
TM
is fully functional.
N+1 - Refers to the level of power module redundancy. “N” represents the number of power modules required
to power the load, and “+1, +2, etc.” represents the number of extra power modules that are installed. For
example, a 7.3 kVA load requires two power modules for adequate protection. If the Symmetra
TM
is configured
with only two modules, it has an “N+0” level of redundancy, or no redundancy. If the system is configured with
three power modules, it has an “N+1” redundancy. Depending on the the load requirements, Symmetra
TM
can
be configured with 2, 3 or even 4 extra power modules, giving it an N+2, N+3, or N+4 level of redundancy.
Redundancy - Refers specifically to power modules. If at least one “extra” power module is installed, the
system can sustain a fault condition and still provide protection to the load equipment. To be fully redundant,
the system should be configured with at least one redundant power module, and a minimum of two battery
modules. (When two or more battery modules are present, one of them can fail and the system will still have a
battery power source. The total number of battery modules determines the length of on-battery run time.)
Scalability - The modular architecture allows the user to increase power capacity as load requirements in-
crease. Scalability is limited by the size of the frame, and the number of available power module bays.
SmartSlot
TM
Accessories - SmartSlot
TM
bays at the rear of the frame accommodate up to four accessory
cards. Before installing any SmartSlot
TM
accessory, ensure it is a compatible “Symmetra
TM
OK” model.
n Share-UPS
TM
- Provides automatic shutdown of up to two additional servers.
n PowerNet
TM
SNMP - Provides network UPS management.
n Measure-UPS
TM
II - Provides environmental information such as ambient temperature and humidity.
n Call-UPS
TM
- Works with an external modem to provide out-of-band UPS management.
System Capacity - The maximum output power that a Symmetra
TM
system can deliver. System capacity is
limited by the lesser of the frame size, or the capacity of the installed power modules.
n A Mini Frame (8kVA) with one power module installed (4kVA) has a system capacity of 4kVA.
n A Master Frame (16kVA) with five power modules (20kVA) has a system capacity of 16kVA.