TelephoneTribute.com – Private Branch Exchange

A private phone system (switch) used by medium and large companies which is connected to the public telephone network (local telco) and performs a variety of in-house routing and switching. Continue reading TelephoneTribute.com – Private Branch Exchange

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Office of Energy Efficiency & Renewable Energy – Total Internal Reflection

The trapping of light by refraction and reflection at critical angles inside a semiconductor device so that it cannot escape the device and must be eventually absorbed by the semiconductor. Continue reading Office of Energy Efficiency & Renewable Energy – Total Internal Reflection