D Channel | The D channel is a packet-switched channel
that carries signaling and control for B channels.
In Basic Rate ISDN (BRI) applications,
it can also support customer packet data traffic at speeds up to 9.6 kilobits
per second.
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Data Terminal Equipment (DTE) | Refers to devices such as personal computers or data terminals, as opposed
to Data Communications Equipment (DCE) such as printers or modems.
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Decibel (dB) | The logarithmic unit of signal power ratio most commonly used in telephony.
It is used to express the relationship between two signal powers, usually between
two acoustic, electric, or optical signals.
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Digital Signal 0 (DS0) | A 64 Kbps high-bandwidth circuit, that delivers
quality that typically can't be duplicated with unconditioned analog
circuits.
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Digital Signal 1 (DS1) | A circuit that provides virtually error-free voice, video and data transmission at speeds up to 1.544 Mbps. This is synonymous with a T1 circuit and contains 24 DS0 channels.
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Digital Signal 3 (DS3) | A circuit
coontaining 672 voice-grade channels capable of handling
multiple data streams in high volume at speeds up to 44.736 Mbps
(commonly referred to as a 45 Megabit channel). This is synonymous with a T3 and contains the equivalent of 28 DS1 (T1) circuits.
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Digital Subscriber Line (DSL) | A generic name for a group of enhanced-speed digital services provided by telephone
service providers. DSL services run on twisted-pair wires and can carry both voice and
data.
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