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Integrate Backup Power into VoIP Networks
Voice over IP (VoIP) is exploding in popularity as an application for business
data networks. VoIP promises to consolidate a company's data and
telecommunications infrastructure as well as its support resources. As a
result, a company can lower its hardware and service costs while raising
productivity through the use of more elaborate and customizable telephony
applications.
Unfortunately, there are serious limitations inherent to the data networks
that are increasingly called upon to support VoIP. The primary limitation is
power availability. Before moving voice traffic from traditional circuit-
switched public phone systems to private data network connections, one
must consider a public phone system's unique attribute—battery support. In
order to deliver extremely high availability for such vital services as
emergency 911 support in the event of extended power outages, public
phone systems are connected to massive battery arrays.
While most data networks have some type of backup support during power
outages (provided by UPS Systems and/or generators), the backup runtime
is generally much less than the 4 to 8 hours of backup that is typically
provided for public phone systems. Because of this shortcoming, VoIP
applications generally require an increase in the UPS System-supported
power capacity (e.g. more or larger UPS Systems). Increased UPS System
capacity provides power for network-dependent phones and increases
overall backup runtime to ensure that normal telephone operation (including
911 service) remains available in the event of an extended power outage.
Reflecting on important lessons learned during its own transition to IP
telephony, Cisco provides several best-practice recommendations. One of
the most important recommendations is installing a UPS System to
guarantee availability:
“Plan Your Power: When an IP network carries voice,
reliability is essential. In case of an emergency,
people need to summon assistance by dialing 911.
When using inline power to switches and routers, make
sure they are connected to an uninterruptible power
supply [UPS System] to guarantee dial tone if the
power should go out.”
Source: Cisco Systems white paper “The Transition to IP Telephony at Cisco Systems”.
http://www.cisco.com/en/US/tech/tk652/tk701/technologies_white_paper09186a00800cb7fd.shtml