Consider the Diverse Needs of VoIP Network Equipment
Typical VoIP
Network Design
Source: Cisco Systems white paper “Power and Cooling for VoIP and IP Telephony Applications”.
http://www.cisco.com/application/pdf/en/ us/guest/netsol/ns412/c654/cdccont_ 0900aecd801a2c5f.pdf
Before selecting a UPS System to ensure 100% availability of IP telephony systems, it's important to consider the unique requirements of VoIP network equipment. Network designs hosting VoIP applications will vary widely from business to business due to a number of variables, including the scale of the network and the variety of legacy equipment involved. However, three devices are common to all networks:
Client Devices (phones,
During the transition to IP telephony, these devices will either (a) derive their power from the network cable via a Power over Ethernet (PoE) connection scheme, or (b) plug into a local AC source.
If they plug into a local AC source, they must be protected by a UPS System. Often a desktop UPS not only safeguards phone service, but also guarantees file integrity for associated PC users.
Networking Devices (switches, routers, etc.)
During the transition to IP telephony, port capacity on the network and in wiring closets will increase to accommodate additional devices (phones) connected to the network. Increased port capacity will increase the power requirements placed on your UPS System, either reducing runtime or overloading the UPS. Note that if a networking device also supplies Power over Ethernet, the aggregate load of all client devices will also be borne by the networking device's UPS System.
Generally, an existing UPS will be inadequate to (a) power the increased load [watts] and (b) power the load for an acceptable length of time. Five to fifteen minutes of runtime provided to gracefully shut down the typical data network is inadequate for IP telephony users who expect phone service to continue for HOURS, not minutes.
Call Processing Devices (servers and related storage systems) During the transition to IP telephony, dedicated servers are typically added to drive voice and messaging applications, while storage systems are required for voicemail and other messaging applications. Similar to the increased burden placed on networking devices, call processing devices will experience increased loads and will require increased runtime.
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