www.tripplite.com Practical Power Guidelines for VoIP and Internet Telephony Applications by David Slotten Cisco, Cisco Systems, the Cisco Systems logo, and the Cisco Square Bridge logo are registered trademarks or trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries.
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.
Consider the Diverse Needs of VoIP Network Equipment 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, PC-based soft phones, etc.
Select a UPS System which Provides the Highest Availability, Resiliency and Manageability When selecting a UPS System, the most obvious criterion to consider is whether a UPS System has enough capacity (VA/watts) to power equipment while having enough battery capacity to operate during a power outage for your required duration. Specific Tripp Lite UPS System recommendations are listed at the end of this document.
Single Power Supply, or Multiple Power Supplies Operating in Redundant Mode STEP 1: Determine Configuration Configuration Power Supply Power Source 1 PS1 Wall 2 PS1 Wall 3 PS2 Wall PS1 UPS1 PS2 Wall 4 PS1 & PS2 UPS1 STEP 3: Consider System Status STEP 2: Consider Failure Scenarios PS1 Status Utility Status UPS Status System Status System Status System Status System Status OK OK OK OK OK OK OK Failure OK OK Crash OK OK Crash OK Blackout OK Crash Crash OK OK OK Blackout UPS1 Battery Crash Crash Crash C
B. UPS System Battery Configuration UPS System availability, and therefore VoIP system availability, is most critically dependent upon the capacity of the UPS System's battery configuration. The number of UPS System batteries, both internal and external, determines the amount of runtime that is provided during a power outage. As mentioned previously, the runtime must fit the application.
With power present, a battery system failure will not cause a system interruption. As long as utility power remains present, the UPS System will continue to power the connected IP telephony system without interruption and will continue to condition the power against most power anomalies. In the event of a power outage, the system will crash. In the event of a battery system failure, the internal batteries of the UPS System and/or the external battery packs can be replaced without a service interruption.
In the event of a power electronics failure, a service interruption needs to be planned to replace the UPS System. With power present, a battery system failure will not cause a system interruption. As long as utility power remains present, the UPS System will continue to power the connected IP telephony system without interruption and will continue to condition the power against many power anomalies. In the event of a power outage, the system will crash.
adequate. Generally, line-interactive UPS Systems do not pose a problem. This is the subject of some debate and is generally presented as a major issue by vendors biased towards selling online UPS Systems. Line-interactive UPS Systems do tend to cost less than on-line UPS Systems and operate with higher efficiency, reducing electrical costs. In theory, an on-line UPS System battery should be used less frequently due to input voltage variation, and will therefore last longer.
Alerts available from most UPS Systems and network cards include: • Voltage levels • Current levels • Temperature levels • Humidity levels • Dry contacts for fire, water, security, etc. • Battery capacity • Battery failure Commands from the administrator to most UPS Systems include: • Reboot system • Reboot outlet(s) • Shut down system • Shut down outlet(s) • Run inverter/battery test Tripp Lite presents a uniquely simple management scheme for VoIP UPS System hardware.
Tripp Lite's PowerAlert Software, version 12.5—which is part of an integrated VoIP power solution that includes a Tripp Lite UPS System—has met the Cisco Technology Developer Partner Program test criteria for interoperability with Media Convergence Servers running CallManager, versions 3.3(4) and 4.0(2). Through participation in the Cisco Technology Developer Partner Program, Tripp Lite's integrated VoIP solution provides continuous IP telephony availability to enterprise customers.
Networking Devices (switches, routers, etc.) Networking hardware will typically drive the most significant changes to your existing power infrastructure. With requirements spanning buildings and remote wiring closets, existing facility-wide backup plans are often impractical or unable to address the requirements of mid-size and large switches. Focused UPS System additions with extended runtime battery configurations more efficiently add the high level of availability that VoIP users demand.
Call Processing Devices (servers and related storage systems) Typically, additional server and storage resources are added to handle call processing, voice messaging and other telephony applications. Such systems tend to reside within the data center and are multi-vendor in origin. For configuration assistance specific to your rollout, please contact Tripp Lite. Tripp Lite maintains interactive sizing and configuration resources at www.tripplite.com/selector.
SmartPro® Line-Interactive UPS Systems Input Nominal Voltage Output Model Range Voltage SMART1500CRMXL 83-145 120 SMART2200RMXL2U 120 120 Capacity (VA/Watts) 1500/1440 2200/1600 Outlet Quantity 8 8 SMART2200CRMXL SMART3000RM2U 83-145 120 120 120 2200/1900 3000/2250 8 9 SMART3000CRMXL 83-145 120 3000/2880 9 SMART5000XFMRXL 208 208 & 120 5000/3750 11 UPS System Extended Runtime SmartOnline On-Line UPS Systems Half load (Watts) Runtime (minutes) Full Load (Watts) with included batteries Outl
SmartPro Line-Interactive UPS Systems Half load (Watts) Runtime (minutes) Full Load (Watts) with included batteries Non-Expandable Battery Pack 1 SMART3000CRMXL Extended Runtime 1440 19 2880 7.5 BP48V24-2U (Non-Expandable) 70.6 28.1 BP48V24-2U (Non-Expandable) 62 24.5 BP48V24-2U (Non-Expandable) 68.8 27.7 BP48V24-2U (Non-Expandable) 59.9 24.9 BP48V24-2U (Non-Expandable) 35.4 14.7 SMART5000XFMRXL Extended Runtime 1875 27 3750 10 N/A N/A SMART1500CRMXL Extended Runtime 720 28.
