Continental Wireless - Resources - Wireless Networking Glossary


Wireless Networking Glossary

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D

D/L	Downlink (e.g. from base station to mobile). Compare with U/L.
DACS	Digital Cross-Connect System
Dark fiber	Unused, laid fiber.
Datagram	Unit of data.
dB	Decibel. 10 times the logarithm of the value in base 10
DB9M	Connector used for RS-232 connections and for several video interfaces on IBM-compatible computers.
dBm	Decibels referenced to one milliwatt
DBS	Digital Broadcast Satellite or Direct Broadcast Satellite (e.g. DirectTV, EchoStar)
DCE	Data Communications Equipment (i.e. a computer)
DCS	Digital Cross-Connect System
DCS(3)	European PCS frequencies in the 1800 MHz range.
DDM	Data Description Method
DEA	US Drug Enforcement Agency
Demux	See Mux.
DES	Data Encryption Standard. Uses private key algorithm; vulnerable to brute-force attacks because of small, 56-bit size of key. Note: National Institutes of Standards and Technology considers DES obsolete, replaced with 'Advanced Encryption Standard'. See AES.
DHCP server	Dynamic Host Configuration Protocol server. Automatically configures network devices; has server capabilities. Public or private IP addresses may be assigned on per-interface basis; multiple private addresses may be assigned to each publicly registered address through use of NAT.
DID	Direct Inward Dialing. Directs all calls to a block of numbers to a PBX
digital	Transmission of information through a signal that can take on only certain discrete values (e.g. bits with values 0 or 1). Compare with analog
Disconnection	The end of a call. Not to be confused with termination of a call or the release of a trunk
DL	Downlink. Radio link from network 'down' to terminal. Compare with UL
DLC	Digital Loop Carrier. A single digital facility (e.g. T1 or T3) carrying multiple lines to a business or other large customer
DLCI	Data Link Connection/Circuit Identifier
DLEC	Data Local Exchange Carrier. Delivers high-speed access to the Internet and not voice.
DN	Domain Name (e.g. cnp-wireless.com).
DNIC	Data network identification code
DNIS	Dialed Number Identification Service. Identifies the called (not calling) number. Only useful when multiple numbers terminate at the same location (e.g. a regular phone number, 1-800 and 1-900 number). Contrast with CNIP
DNS	Domain Name System. Globally distributed database that matches Web site URLs to numerical IP addresses. Governs routing of all Internet traffic.
DOA	Dead On Arrival
DoC	US Department of Commerce
DOJ	US Department of Justice
Domain	A portion of the internet (e.g. cnp-wireless.com)
DPSK	Differential PSK
DQPSK	Differential Quadrature PSK
DRAC	Dynamic Resource Allocation Control
DRM	Digital Rights Management
Drop	Cable and hardware from tap to subscriber. 'Drop Cable' is 330 feet or less of coaxial cable
Dry pair wires	Building wires not in use.
DS0	Digital Signal Level 0. A 64 kbps digital link used to carry a single voice conversation or signaling traffic for multiple calls/trunks. In ANSI networks, 8 kbps is usually reserved for in-band signaling (on-hook/off-hook etc.), reducing the bandwidth to 56 kbps
DS1	Digital Signal Level 1. A 1.544 Mbps signaling link carrying 24 DS0 channels
DS1C	Digital Signal Level 1C. A 3.152 Mbps signaling link carrying 48 DS0 channels
DS2	Digital Service, Level 2. 6.312 Mbps. Carries 96 DS0 channels (4 DS1 channels)
DS3	Digital Service, Level 3. 44.736 Mbps. Carries 672 DS0 channels (28 DS1 channels)
DSA	Digital Signature Algorithm
DSCP	Differentiated Services Code Point. In QoS, modification of (ToS) type of service byte. Six bits of this byte allocated for use as DSCP field, where each DSCP specifies particular per-hop behavior that is applied to a packet.
DSF	Dispersion Shifted Fiber
DSI	Digital Speech Interpolation
DSL	SHDSL, ADSL, SDSL, VDSL - Digital Subscriber Line. Foundation is the 4-wire telephone cable standard throughout North America. Technology for transmitting digital information at high bandwidth on existing phone lines; continuously available, "always on" connection.
DSLAM	Digital Subscriber Line Access Multiplexer. Network multiplexing device that receives signals from multiple customer DSL connections and puts them on a high-speed backbone. May connect DSL lines with some combination of ATM, frame relay or Internet Protocol networks. Enables phone company to offer business or residential users fastest phone line technology (DSL) with the fastest backbone network technology (ATM). Top speeds 1.5M bit/sec, but lower cost than a T-1 or ISDN connection.
DSP	Digital Signal Processing/Processor
DSU	Digital Service Unit. Interface between the terminal equipment (DTE) and the service provider's facilities
DTE	Data Terminal Equipment. RS-232C interface used by computer to exchange data with modem or other serial device. See RS-232C.
DTMF	Dual Tone Multifrequency. Tone signaling used by phones
DTSS	Dynamic Time-Synchronized Spreading
DTX	Discontinuous Transmission. A mobile only transmits when the user is talking. This saves battery life, but can introduce some choppiness into conversations
Dual-band	A mobile that can support two different frequency ranges. Compare with Dual-mode
Dual-mode	A mobile that can support two different technologies. Compare with Dual-band
Duplex	Both ends of communication can send and receive signals at the same time. Also known as full-duplex communication. ‘Half-duplex’ is also bi-directional communication, but signals can only flow in one direction at a time.
DWDM	Dense Wave Division Multiplexing/Dynamic Wavelength Division Multiplexing. Optical technology used to increase bandwidth over existing fiber optic backbones. See CWDM.
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