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IP Office Installation Page 35
15-601042 Issue 20b (16 July 2009) IP Office
System Overview: Power Supply Cords
2.12 Power Supply Backup
The use of an Uninterrupted Power Supply (UPS) with any telephone system is recommended. Even at sites that rarely
lose electrical power, that power may occasionally have to be switched off for maintenance of other equipment. In
addition, most UPS's also provide an element of power conditioning, reducing spikes and surges.
The capacity of UPS systems and the total equipment load the UPS is expected to support are usually quoted in VA.
Where equipment load is quoted in Watts, multiply by 1.4 to get the VA load.
The calculation of how much UPS capacity is required depends on several choices.
•
What equipment to place on the UPS?
Remember to include server PC's such as the voicemail and Feature Key Server PC's. It is recommended that the total
load on a new UPS is never greater than 75% capacity, thus allowing for future equipment.
•
How many minutes of UPS support is required?
Actual UPS runtime is variable, it depends on what percentage of the UPS's capacity the total equipment load
represents. For example, a 1000VA capacity UPS may only support a 1000VA (100%) load for 5 minutes. This
relationship is not linear, the same UPS would support a 500VA (50%) load for 16 minutes. Therefore the lower the
percentage of capacity used, the increasingly longer the UPS runtime, typically up to 8 hours maximum. Remember
also that for most UPS's the ratio of discharge to full recharge time is 1:10.
•
How many output sockets does the UPS provide?
Multiple UPS units may be required to ensure that every item of supported equipment has its own supply socket.
The web site http://ups.avayaups.com provides a calculator into which you can enter the equipment you want supported
on a UPS. It will then display various UPS options. The site uses VA values for typical IP Office systems. However, if more
specific values are required for a particular system, the table below can be used to enter values.
Typical IP Office System VA Typical IP Office System VA
Small Office Edition 17 IP412 System 312
IP406 V2 System 168 IP500 System 230
Individual Equipment VA Individual Equipment VA
Small Office Edition 17 So8 Module 34
IP406 V2 Control Unit 23 Phone 8 Module 17
IP412 Control Unit 25 Phone 16 Module 23
Analog 16 Module 88 Phone 30 Module 42
Digital Station 16 Module 34 Typical Server PC 600
Digital Station 30 Module 42 Typical Desktop PC 400
WAN3 Module 17 Mid Span PSU - 6 ports 150
Mid Span PSU - 12/24 ports 300
•
The 1151D2 power supply unit for Avaya H.323 IP phones includes a backup battery. This typically provides 15
minutes backup at maximum load (20 Watts) and up to 8 hours at light load (2 Watts).