Acronyms

---

A-J

AAL	ATM adaptation layer
ABATS	automated bit access test system
ABM	Accunet bandwidth manager (AT&T)
ABR	available bit rate
AC	address copied
ac	alternating current
AC	access control
ACD	automated call distributor
ACK	acknowledgement
ACL	access control list
ACP	access control point
ADCR	alternate destination call routing (AT&T)
ADM	add-drop multiplexer
ADN	advanced digital network (Pacific Bell)
ADPCM	adaptive differential pulse code modulation
AES	advanced encryption standard
AI	artificial intelligence
AIOD	automatic identification of outward dialed calls
AM	amplitude modulation
AMI	alternate mark inversion
ANI	automatic number identification
ANR	automatic network routing (IBM Corp.)
ANSI	American National Standards Institute
AP	access point
APC	access protection capability (AT&T)
API	application programming interface
APPC	advanced program-to-program communications (IBM Corp.)
ARB	adaptive rate based (IBM Corp.)
ARCnet	attached resource computer network
ARP	address resolution protocol
ARS	action request system (Remedy Systems, Inc.)
AS	autonomous system
ASCII	American standard code for information interchange
ASIC	application specific integrated circuit
ASN.1	abstract syntax notation 1
ASP	application service provider
ASTN	alternate signaling transport network (AT&T)
AT&T	American Telephone & Telegraph
ATIS	Alliance for Telecommunications Industry Solutions
ATM	asynchronous transfer mode
ATM	automated teller machine
AUI	attachment unit interface
AWG	American wire gauge
B2B	business to business
B8ZS	bipolar eight zero substitution
BBS	bulletin board system
BCP	business continuity plan
BECN	backward explicit congestion notification
Bellcore	Bell Communications Research
BER	bit error rate
BERT	bit error rate tester
BGP	border gateway protocol
BIOS	basic input-output system
BMC	block multiplexer channel
BMS-E	bandwidth management service-extended (AT&T)
BOC	Bell operating company
BootP	Boot Protocol
BPDU	bridge protocol data unit
BPS	bits per second
BPV	biploar violation
BQB	Bluetooth qualification body
BQTF	Bluetooth qualification test facility
BRI	basic rate interface (ISDN)
BSC	binary synchronous communications
CA	call agent
CAD	computer-aided design
CAM	computer-aided manufacturing
CAN	campus area network
CAP	competitive access provider
CAR	committed access rate
CASE	computer-aided software engineering
CATV	cable television
CBR	case-based reasoning
CBR	constant bit rate
CBQ	class-based queuing
CBT	computer-based training
CCC	clear channel capability
CCITT	Consultative Committee for International Telegraphy and Telephony
CCR	customer-controlled reconfiguration
CD	carrier detect
CD	compact disk
CD-ROM	compact disk-read only memory
CDP	content delivery provider
CDPD	cellular digital packet data
CDR	call detail record
CEO	chief executive officer
CERT	computer emergency response team
CHAP	Challenge Handshake Authentication Protocol
CI	component interface
CIO	chief information officer
CIR	committed information rate
CIS	Center for Internet Security
CISSP	certified information systems security professional
CLEC	competitive local exchange carrier
CLEI	common language equipment identifier
CLI	command line interface
CMI	common information model
CMIP	Common Management Information Protocol
CMOS	complementary metal oxide semiconductor
CNMS	central network management system
CO	central office
COA	care-of-address
CON	concentrator
COPS	common open policy system
CoS	class of service
CPE	customer premises equipment
CPU	central processing unit
CRC	cyclic redundancy check
CSA	certified security administrator
CSE	certified security engineer
CSMA/CA	carrier sense multiple access with collision avoidance
CPE	customer premises equipment
CSMA/CD	carrier sense multiple access with collision detection
CSO	chief security officer
CSU	channel service unit
CTI	computer-telephony integration
CTS	clear to send
CTO	chief technology officer
DA	destination address
DACS	digital access and cross-connect system (AT&T)
DAP	Demand Access Protocol
DAS	dual-attached station
DASD	direct access storage device (IBM)
dB	decibel
DBMS	database management system
DBU	dial backup unit
dc	direct current
DCE	data communications equipment
DCE	distributed computing environment
DCF	data communications function
DCN	data communication network
DCS	digital cross-connect system
DDS	digital data service
DDS/SC	digital data service with secondary channel
D/E	debt/equity (ratio)
DEC	Digital Equipment Corp.
DECT	digital enhanced cordless telecommunication
DES	data encryption standard
DFSMS	data facility storage management subsystem (IBM Corp.)
DHCP	Dynamic Host Configuration Protocol
DID	direct inward dial
DIF	digital interface frame
DiffServ	differentiated services (IETF)
DIP	debtor in possession
DLCI	data link connection identifier
DLL	data link layer
DLSw	data link switching (IBM Corp.)
DM	distributed management
DME	distributed management environment
DMI	desktop management interface
DMP	dynamic multipathing
DMTF	Desktop Management Task Force
DNS	domain name system
DoD	Department of Defense (United States)
DOD	direct outward dial
DOS	disk operating system
DOV	data over voice
DS0	digital signal: level zero (64 Kbps)
DS1	digital signal: level one (1.544 Mbps)
DS1C	digital signal: level one C (3.152 Mbps)
DS2	digital signal: level two (6.312 Mbps)
DS3	digital signal: level three (44.736 Mbps)
DSL	digital subscriber line
DSLAM	digital subscriber line access multiplexer
DSN	defense switched network
DSP	digital signal processor
DSSS	direct-sequence spread-spectrum
DSU	data service unit
DTE	data terminal equipment
DTMF	dual-tone multifrequency
DTR	dedicated token ring
DTU	data transfer unit
DWDM	dense wavelength division multiplexing
DXI	data exchange interface
ECSA	Exchange Carriers Standards Association
ED	ending delimiter
EDI	electronic data interchange
EDRO	enhanced diversity routing option (AT&T)
EEOC	Equal Employment Opportunity Commission
EEROM	electronically erasable read-only memory
EFT	electronic funds transfer
EGP	External Gateway Protocol
EIA	Electronic Industries Association
EISA	extended industry standard architecture
EMAIL	electronic mail
EMI	electromechanical interference
EMS	element management system
EP	extension point
EPS	encapsulated postscript
ESCON	enterprise systems connection (IBM Corp.)
ESF	extended super frame
4GL	fourth generation language
FA	foreign agent
FAQ	frequently asked questions
FASB	Financial Accounting Standards Board
FASTAR	fast automatic restoral (AT&T)
FAT	file allocation table
FC-AL	Fibre Channel–Arbitrated Loop
FC	Fibre Channel
FC	frame control
FCC	Federal Communications Commission
FCIA	Fibre Channel Industry Association
FCS	frame check sequence
FDD	frequency division duplexing
FDDI	fiber distributed data interface
FDL	facilities data link
FECN	forward explicit congestion notification
FEP	front-end processor
FFDT	FDDI full-duplex technology
FHSS	frequency-hopping spread-spectrum
FIFO	first in first out
FM	frequency modulation
FOD	fax on demand
FRAD	frame relay access device
FRF	Frame Relay Forum
FS	frame status
FT1	fractional T1
FTP	File Transfer Protocol
FTS	Federal Telecommunications Service
FX	foreign exchange
GAAP	generally accepted accounting procedures
GIAC	global information assurance certification
GMT	Greenwich mean time
GNU	GNUs not UNIX
GPL	general public license
GPRS	general packet radio service
GUI	graphical user interface
HA	home agent
HDLC	high-level data link control
HP	Hewlett-Packard Co.
HASP	Houston Automatic Spooling Program
HEC	header error check
HFC	hybrid fiber coax
HIPAA	Health Insurance Portability and Accountability Act
HPR	high-performance routing (IBM Corp.)
HSM	hierarchical storage management
HSTR	high-speed token ring
HSTRA	High-Speed Token Ring Alliance
HTR	high-speed token ring
HTTP	Hypertext Transfer Protocol
HTTPS	Hypertext Transfer Protocol over SSL
HVAC	heating, ventilation, and air conditioning
IAB	Internet Activities Board
IAD	integrated access device
IANA	Internet Assigned Numbers Authority
ICMP	Internet Control Message Protocol
ICP	integrated communications provider
ICS	intelligent calling system
ID	identification
IDDD	international direct distance designator
IDP	Internetwork Datagram Protocol (Xerox Corp.)
IEEE	Institute of Electrical and Electronic Engineers
IESG	Internet Engineering Steering Group
IETF	Internet Engineering Task Force
IF	intermediate frequency
IGP	Interior Gateway Protocol
IIS	Internet information server (Microsoft Corp.)
IKE	Internet key exchange
IMA	inverse multiplexing over ATM
IMS/VS	information management system/virtual storage (IBM Corp.)
ILEC	incumbent local exchange carrier
IMA	inverse multiplexing over ATM
IN	intelligent network
I/O	input/output
IOC	interoffice channel
IP	Internet Protocol
IPsec	Internet Protocol with security
IPX	Internet packet exchange
IR	infrared
IRC	Internet relay chat
IRQ	interrupt request
IRR	internal rate of return
IS	information system
ISA	industry standard architecture
ISC2	International Information Systems Security Certification Consortium
iSCSI	Internet-protocol small computer system interface
ISDN	integrated services digital network
ISL	interswitch link
ISO	International Organization for Standardization
ISOC	Internet Society
ISP	Internet service provider
IT	information technology
ITR	intelligent text retrieval
ITU	International Telecommunication Union
ITU-TSS	International Telecommunication Union-Telecommunications Standardization Sector (formerly CCITT)
JPEG	Joint Photographic Experts Group

---