Image 1 Image 2
Reveal Logo
Search for
View basket Check Out
Sales andSupport: 01635 873374
Audio & Video HiFi PC, Mac
Help Site Map Terms and Conditions Contact Us

Next day P&P £9.40
1st class P&P £3.57
2nd Class P&P £2.35
including VAT


Cable, Network Acronyms, Glossary and Term

A   B   C   D   E   F   H   I   L   M   N   O   P   R   S   T


D-Subminiature: A common connector type that utilises multiple pins and a D shaped housing.

D: Delta or data channel, 16 kBit/s in BRI, 64 kBits in PRI, used for signalling and perhaps some packet data.

D3: Third generation channel blank, 24 channels on one T1

D4: Fourth generation digital bank, up to 48 voice channels on two T1's or one T1C.

D5: Fifth generation channel bank with ESF.

DA: Destination address, field in frame header, 802.

D/A: Digital to analogue decoding of voice signal

D/A: Drop and Add, similar to drop and insert.

DARPA: Defence ARPA, formerly just ARPA.

DAS: Dual Attach, Access Station, device on a main dual FO rings, 4 fibres FDDI

DASS: Digital Access Signalling, protocol for ISDN D channel in the UK.

dB: Decibel, 1/10th of a bel; 10 log (x/y) where x/y is a ratio or like quantities, i.e. power.

dBm: Decibel level referenced to 1mW at 1004 Hz into 600 ohms impedance.

dBm0: Power that would be at zero TLP reference level.

dBrn: Power level relative to noise, dBm + 90

dBrn: dBrn through a C weighted audio filter, matches the ear's response.

DB25: Code for 25 pin connector specific for RS232 interface.

D.C.: Direct current used for some signalling forms

DCC: Data Communications Channel, overhead connection in D bytes for SONENT management.

DCE: Digital circuit termination equipment

DCE: Data Communications equipment

DCS: Digital Cross Connected, DACS

DDCMP: Digital data Communications message protocol.

DDD: Direct distance dialling, refer to PSTN

DDS: Digital data system, network that supports DATAPHONE digital services

DDSD: Delay Dial Start Dial, a start stop protocol for dialling into a CO switch

DES: Data Encryption Standard, moderately difficult to break

D/I: Drop and Insert a mux function or type

Dielectric: The insulating material that separates the centre conductor and the shielding.

Digtal Camera cable finder

Digital Flat Panel connector: was used in earlier digital LCD computer monitors. It was restricted by resolution and has been superseded by DVI. DVI-I graphics cards can be connected to DFP monitors by an adapter. The image shows a DFP socket.

DIP: Dual In-line Package, for silicon chips and switches

DIS: Draft International Standard, preliminary form of OSI standard

DISC: Disconnect, command frame sent between LLC entities, layer 2.

DLC: Data Link Connection, one logical bit stream in LAPD, layer 2.

DLC: Digtal Loop Carrier, mux system to gather analogue loops and carry them to CO.

DLCI: Data Link Connection Identifier, address in a frame, I.122

DLE: Data Link Escape, ESC.

DLL: Data Link Layer, Layer 2 OSI.

DM: Disconnected Mode, LLC frame to reject a connection request, layer 2.

DMC: Differential Manchester Code, pulse pattern that puts transition at centre of each bit time for clocking, transition at start of period for 0, 802.5

DMI: Digitally Multiplexed Interface, AT&T interface for 23 64 Kbits channel and a 24th for signalling.

Drawing: The mechanical process of making conductors smaller by forcing through dies.


Digital Visual Interface (Digital only) connector: is used in LCD computer monitors. A competitor to DFP, it allows higher resolutions and will connect to digital DVI and DFP graphics cards (with an adapter.). It is being superseded by DVI-I.
Digital Visual Interface (Integrated) Connector: is the most versatile of connectors for monitors. A DVI-I connection on a monitor will connect to DVI-I graphics cards and to DVI-D, DFP and 15 pin VGA analogue cards with suitable adapters. Conversely, you can connect DVI-D and DFP monitors to DVI-I cards with suitable adapters.

We accept payment using PayPal logo or Netbanx Logo
We accept all major credit and charge cards.

Credit and debit card logs
BizRate Customer Certified (GOLD) Site
All pictures for illustration purposes only.
Copyright ©2001 - 2009 Reveal Ltd, All rights reserved.