Select first letter of word:
0-9
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
(suggestions for additions of acronyms or terms)
| Acronym | Description |
|---|---|
| DNP3 | Distributed Network Protocol is a set of communications protocols intended to insure interoperability between substation outstations and master stations for the electric utility industry. It is also widely used in the oil and gas industry. |
| DNS | Domain Name System. The distributed name/address mechanism used in the Internet. The DNS maps a name like "polaris.interop.com" to its IP address 192.88.197.100. Reverse lookup from the IP address to the name is also possible using the DNS. |
| DOCSIS | Data Over Cable Service Interface Specification |
| domain | In the Internet, a part of a naming hierarchy. Syntactically, an Internet domain name consists of a sequence of names (labels) separated by periods (dots), e.g., "msn.com" In OSI, "domain" is generally used as an administrative partition of a complex distributed system, as in MHS Private Management Domain (PRMD), and Directory Management Domain (DMD). |
| dotted decimal notation | The syntactic representation for a 32-bit integer that consists of four 8-bit numbers written in base 10 with periods (dots) separating them. Used to represent IP addresses in the Internet as in: 192.67.67.20. Also called "dotted quad notation." |
| DQDB | Distributed Queued Dual Bus |
| DS-1 | 1.544Mbit/s.24 voice. T-1 system. Usually wire. |
| DS-1C | An enhancement to T1 allowing 3.152 Mbit/s. |
| DS-0 | A single voice signal in a digital from takes 64,000 bit/s. 1 voice. |
| DS-2 | 6.312 Mbit/s. 96 voice. T-2 system. Usually cable. |
| DS-3DS3 | 44.736 Mbit/s 672 voice. T-3 system. Microwave or Optical Fiber |
| DS-4 | 274.176 Mbit/s. 4032 voice, T-4 system. Optical fiber. |
| DSA | Directory System Agent. The software that provides the X.500 Directory Service for a portion of the directory in Formation base. Generally, each DSA is responsible for the directory information for a single organization or organizational unit. |
| DSL | Digital Subscriber Line. There are five versions of DSL. HDSL, SDSL, ADSL, RADSL, and VDSL. |
| DSLAM | Digital Subscriber Line Access Multiplexer This device is generally found at the Telco terminating multiple DSL lines. |
| DSU | Digital Service Unit. A component of customer premise equipment used to interface to a digital circuit (DDS or T1); combined with a channel service unit (CSU), it converts a customer's data stream to bipolar format for transmission. See CSU. |
| DSU/CSU | A device which includes the CSU and the DSU in the same unit. |
| DSVD | A technology patented by Multi-Tech, which lets you simultaneously talk and send data over one analog line. |
| DSX-1 | Digital Cross-connect, level 1. A point where DS1 signals are cross connected between equipment. This could be at a CO, POP, or PBX connection. |
| DT | Dial Tone |
| DTE | Data Terminal Equipment. Any digital device such as a terminal, printer, or computer that transmits and receives data. |
| DTMF | Dual Tone Multi Frequency. (Also known as Touch Tone TM). DTMF is used for dialing and for communicating with interactive telephone systems such as voice mail. It uses two tones to represent each key on the telephone touch pad. The tones are presented in a matrix of rows and columns. When any key is pressed the tone of the column and the tone of the row are generated, hence dual tone. As an example, pressing the "5" (second column, second row) button generates the tones 770Hz and 1336 Hz. |
| DTT | Direct Trunk Transport |
| DUA | Directory User Agent. The software that accesses the X.500 Directory Service on behalf of the directory user. The directory user may be a person or another software element. |
| DVMRP | Distance-Vector Multicast Routing Protocol. DVMRP is a distance-vector routing protocol designed to support the forwarding of multi-cast datagrams through an internetwork. |
| DWDM | Dense Wavelength Division Multiplexing allows for multiple signals to be sent simultaneously over a fiber by having each of those signals on a different wavelength. This technology significantly increases the amount of data that can be passed over the fiber. |
| dynamic adaptive routing | Automatic rerouting of traffic based on a sensing and analysis of current actual network conditions, not including cases of routing decisions taken on predefined information. |
| Dying Gasp | is feature that enables a device to store a small amount of power to enable it to send out a SNMP trap to alert a management station in the event of a power failure. |