Follow Applicable Industry Standards - Extreme Networks 8520 Series Hardware Installation Manual

Follow Applicable Industry Standards

Provide a Suitable UPS Transition Time
UPS transition time is the time required for the UPS to change from providing AC power derived from
the utility (or mains) supply to providing AC power derived from the battery backup. UPS transition
time is sometimes called UPS transfer time.
UPS transition times vary between UPS models and implementations, but shorter transition times are
preferred. For Extreme Networks stacking products, a UPS transition time of 20 milliseconds or less
ensures optimum performance and minimizes service interruptions.
For high-availability and fault-tolerant installations in which the switches use redundant power supply
units (PSUs), ensure that each PSU in a switch is connected to a different UPS and that each UPS is
powered by an independent AC supply. This will prevent service interruptions when a power source is
lost, or when a UPS unit fails. (Note that a single, appropriately sized UPS can power PSUs in multiple
switches. The recommendation is simply that for any given switch, the two PSUs should be connected
to different UPS units.)

Follow Applicable Industry Standards

Always follow applicable industry standards.
For more information, see the following ANSI/TIA/EIA standards:
•
ANSI/TIA/EIA-568-A—the six subsystems of a structured cabling system
•
ANSI/TIA/EIA-569-A—design considerations
•
ANSI/TIA/EIA-606—cabling system administration
•
ANSI/TIA/EIA-607—commercial building grounding and bonding requirements
You can access these standards at:
30 Extreme 8520 Series Hardware Installation Guide
www.ansi.org or www.tiaonline.org.
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