Here is a great introduction to a practical application of electromagnetic theory—the field telephone. It’s a training film from 1961 that covers the sound-powered, local battery, and common battery ...

A telephone is a device designed to conduct simultaneous transmission and reception of voice over a network. It is the most widely used telecommunications medium in the world since 1876. Since its ...

Today, we’d like to get back to a few basics about the relationship between the public-switched telephone network and voice over IP. The PSTN includes a signaling system, a series of central offices ...

As a Linux Journal reader, you've probably stumbled across Google Android here and there. You've probably read an introductory article or maybe you even downloaded an ...

The telecommunications prov-ider at one of the lower Gulf states is to have trial tests for IP telephony in 2003 for a possible commercial rollout in 2004. The telecommunications prov-ider at one of ...

CHENNAI: Chennai is on the threshold of a major telecom battle as Bharti is all set to unleash its basic telephony services. chennai: chennai is on the threshold of a major telecom battle as bharti is ...