Since most VoIP telephone sets require an external power source (not powered inline), planning for power is as important as the telephone set itself.

This TECH-Topic focuses on VoIP power. Based on the NIST recommendations regarding VoIP deployment, we wanted to give you some guidance in this area and note that this technology is “Under Construction.” NIST Recommendation – Evaluate costs for additional power backup systems that may be required to ensure continued operation during power outages.

TECHtionary analysis is that most VoIP phones and soft phones require power. Customers should add power injectors, backup power, and generators to all critical functions including diverse wiring to emergency centers. According to industry sources, there are not uniform implementation of standards with regard to PIN assignments and voltages provided or required. Here are some of the options with output DC [Direct Current] voltage on the same PIN (metal connectors) and RJ-Registered Jack types as data connections:

• Single port injector – used for a small number of devices

• Multi-port injectors – used for a large number of devices (e.g. 50+)
• Active Taps – transform input DC voltage to a different DC voltage
• Passive Taps – same DC output voltage as input DC voltage
• Passive injectors – insert power without short-circuit (lightning, etc.) or over-current protection
• Active injectors or Fault-Protected provide continuous monitoring of short-circuit conditions and out-of-range current (surges, sags) protection.

NOTE: Check with the manufacturer for specific options.

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