Pegmatite veins, which can form sheets, lenses, or pipes, are often several hundred meters thick and several kilometers long and can be traced at depths of more than 1 km. They occur in clusters that usually cover an area of up to tens of km 2 and that contain from several tens of individual veins to several thousand.
What is a digital telephone line? A digital telephone line or digital trunk is a type of telephone line that carries voice and/or data by using digital sampling.1 vs. PRI. PRI divides a T1 digital signal into 24 channels of 64 Kbps capacity per channel. 23 of these channels can be assigned as one telephone call each, the equivalent of having 23 separate telephone lines. The 24th channel is used for signaling information and special features such as caller ID.
A Guide To Computer Modems. The Basics. Most phone lines were designed to carry tonal (analog) signals. The Public Switched Telephone Network (PSTN) picks up these tonal signals, and usually converts them into digital signals to transfer them from one Central Office (CO) to another. On the other end, the digital signals are converted back into an analog signal. How does a computer use a phone line? Modem is an acronym for MOdulator/DEModulator. It converts the digital signal from your computer into an analog signal that can be carried by the phone line, and vice versa. It is also possible to get a digital line (ISDN) installed in your home, but you would need an adapter in order to resolve the different digital signals.