Telecommunications
Glossary
- DA
- Directory Assistance
- Phone
Number Lookup Service
DAL - Dedicated Access Line
- A non-switched
circuit from the customer to a carrier.
DDD - Direct Distance Dialing
- Any switched
telecommunication service (like 1+, 0++, etc.) that allows a call originator
to place long distance calls directly to telephones outside the local
service area without an operator.
Deactivation
- A request
to terminate service (or the process of terminating service)
Dedicated Line
- A private
line leased from a telecommunications carrier.
Default Carrier
- Your regular
Dial-1 carrier. Call 1-700-555-4141 to find your default carrier.
Dial
- To Place
A Call On A Switched Network. The term "dial" is obsolete
- based on rotary dial phones and electromechanical relay switches (which
are nearly non-existent in modern telephone systems.) Touch Tone service
recognizes dual tones that are generated as each telephone key is pressed.
Where Touch Tone service is not available, telephones and switches electronically
"pulse" signals that emulate the older rotary dial telephones.
The terms "place" a call or "originate" a call are
more accurate than "dial".
Dial Tone
- Ready
To Place/Originate A Call. When the off hook indication is received
at a central office, a dial tone signal is sent to the originating caller
on a switched network to indicate that the switch is ready to accept
a number.
Dialer
- Equipment
that pulses out a standard dial protocol signal.
Digital
- A device
or method that uses discrete variations in voltage, frequency, amplitude,
location, etc. to encode, process, or carry binary (zero or one) signals
for sound, video, computer data or other information. For example, a
digital clock displays the time as discrete numeric values, rather than
angular displacement of analog hands. Digital communications technology
generally permits higher speeds of transmission with a lower error rate
than can be achieved with analog technology. When analog signals are
received and amplified at each repeater station, any noise is also amplified.
A digital signal, however, is detected and regenerated (not amplified).
Unlike amplification, any noise (less than a valid signal) is eliminated
by digital regeneration.
Directory Assistance - DA
- An information
service whereby operators assist customers in obtaining the telephone
number(s) they wish to call.
Telecommunications glossary
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Telecommunications Glossary "D"
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