[ Numerics | 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 ]
L
L - length
L/L - long local
L2F - Layer Two Forwarding
L2TP - Layer Two Tunneling Protocol
LA - line amplifier
LAB - logic array block
LAD-GNSS - local area differential global navigation satellite system
LAN (Local Area Network) - A type of high-speed data communications arrangement wherein all segments of the transmission medium (typically coaxial cable, twisted-pair wire or optical fiber) are in an office or campus environment under the control of the network operator.
LANACS - local area network asynchronous connection server
LANE - local area network emulation
LANET - Lucent Limitless ATM Network
LANTDIS - Atlantic Command deployable intelligence terminal
LAPB - link access procedure balanced (protocol)
LAPD - link access procedure direct (protocol)
LAPM - link access procedure for modems
LAS - local area system
LASINT - Laser Intelligence
LAT - local access terminal
LATA - Local Access and Transport Area. The area within which calls are routed by your Local Exchange Carrier (LEC). Under the divestiture of the Bell System calls going outside of this area must be handled by an Interexchange carrier (IEC). With the latest round of de-regulation the usual IEC companies are being allowed to compete in the IntraLATA long distance market and LECs are beginning to be permitted to handle InterLATA calls.
Latching Loopback - A (more) complex method of implementing network loop-in. A complex sequence of NCCs and specific data patterns controls implementation and release of a latching loopback. Latching loopback requires a specific NCC to release or "unlatch" the loop-in, whereas "nonlatching" loopback is released when the network side stops transmitting the loopback code. A latching loopback provides a means to perform more thorough testing because any data pattern can be transmitted between the time the loop-in is "latched" and "unlatched," whereas nonlatching loopback requires that loopback code be transmitted every other byte. Also see nonlatching loopback.
LAW - local authority workstation
LAW - light antitank weapon
LAWN - local area wireless network
lb - pound
LB - local battery
LBA - logical block addressing
LBO - line built out
LBS - local base station
lbs - pounds
LBSS - lightweight battlefield surveillance system
LBT - listen before talk
LBT1 - limited bandwidth T1
LBX - low bandwidth X
LC - line concentrator
LCB - line circuit board
LCC - Land Component Commander
LCC - local control center
LCC - logic control cell
LCC - amphibious command ship
LCC - link communications circuit
LCCES - light contingency communications extension switch
LCCP - light contingency communications package
LCCPS - light contingency communications parent switch
LCCS - Life Cycle Contractor Support (For C4I)
LCD - Liquid Crystal Display
LCDL - low cost data link
LCES - line conditioning equipment scanner
LCMS - Local COMSEC Management System
LCP - link control protocol
LCR - least-cost routing
LCS - large complex systems
LCSE - life cycle software engineering
LCSEC - Life Cycle Software Engineering Center
LCSS - land combat support system
LCSS - life cycle software support
LCT - low cost terminal
LCU - lightweight computer unit
LD - load
LD-CELP - (Low Delay Code Excited Linear Prediction) - A voice compression module which uses a backward-adaptive analysis-by-synthesis algorithm. This voice module offers the advantages of toll quality voice compression while maintaining the ability to transmit group III FAX.
LD-CELP Post-Filter - The Post-Filter is used to add additional voice quality to the decompressed voice signal at end-points in the network.
LDA - logical device address
LDAP - Lightweight Directory Access Protocol
LDC - lightweight deployable communications
LDF - lightweight digital facsimile
LDGPS - local area differential global positioning system
LDI - long dwell imagery
LDI - line driver interface
LDM - limited distance modem
LDMX - Local Digital Message Exchange
LDN - Listed Directory Number. When a number of Telco channels share the same hunt group it is customary to give out only one phonenumber for the group, although generally each channel will have its own number. The number given out is the "Listed Directory Number" since that is the number that would be listed in the Telephone Directory and given to customers. See also Hunt Group.
LDO - limited duty officer
LDR - low data rate
LDR - leader
LDRM - low data rate multiplexer
LDS - long distance service
LDU - local distribution unit
LDV - lock data views
LDVM - legacy PPT/Voice Module
LEA - Law Enforcement Agency
LEAF - law enforcement access field
LEAP - leading edge advanced packages
LEASAT - leased satellite
Leased Line - A dedicated circuit, typically supplied by the telephone company, that permanently interconnects two or more user locations; generally voice-grade in capacity and range of frequencies supported. It is typically analog, though sometimes it refers to DDS subrate digital channels (2.4 to 9.6 kbps); could be point-to-point or multipoint.
Least-Cost Routing - The capability of a switch, either a node or a PBX, to automatically determine an optimal route establishing a circuit; also called automatic route selection.
LEC - Local Exchange Carrier. Your local telephone service provider which is either an RBOC or an Independent. In other words, a traditional phone company. In contrast to CLEC or IEC.
LECP - line ECP
LED - light emitting diode
LEM - language extension module
LEN - low entry networking
LEN - Large Extension Node
LENS - large extension node switch
LEO - Law Enforcement On-Line (FBI)
LEO - low Earth orbit
LES - Leading Edge Services (DISA)
LES - Litton Emulation Software
LF - low frequency
LFB - look ahead for busy
LFI - last file indicator
LFN - long fat network
LFSR - linear-feedback shift-register
LG - loop group
LGDT - load global descriptor table
LGM - Loop Group Multiplexer
LGSM - light ground station module
LH - left hand
LHA - general purpose amphibious assault ship
LHD - general purpose amphibious assault ship (with internal dock)
LIA - Legacy Interface Adapter
LIDT - load interrupt descriptor table
LIFO - last in, first out
LIM - Litton Interface Manager
LIMS - laboratory information management system
LINCS - Leased Interfacility National Airspace Communications System
Line - An electrical connection between a telephone service providerÕs switch (LEC or CLEC) and a telephone terminal or Key system. An electrical connection between a telephone service providerÕs switch and another switch is called a trunk. Note that some type of physical lines offer more than one channel. I.E. a BRI circuit has 2 channels, called B channels. This term is a confusing one. See Channel. See also Station Line
Line Card - The circuit in the Telco switch to which your line is connected. On an ISDN circuit the line card performs a role analogous to the NT1 in adapting and equalizing the circuit.
Line Coding, T1 - The clock signal for T1 is derived at the far end from the data bits themselves. Therefore T1 lines have certain restrictions as to the data allowed. No more than 15 zeros shall be sent in a row; and average density of 12.5% ones must be maintained. The CSU is responsible to ensure that these requirements are met. The line encoding method, AMI or B8ZS determines exactly how these requirements are met while still allowing recovery of the original data at the far end. Your Telco will determine the method used on a specific circuit. B8ZS is preferred. E1 circuits have similar restrictions. HDB3 is preferred for E1 circuits.
Line Format, T1 - Modern T1 circuits usually use either Superframe (sometimes called SF or D4) or Extended Superframe (sometimes called ESF) line formatting. The type of framing used is determined by your Telco. ESF is preferred. See ESF and SF
Line Hit - An incident of electrical interference causing unwanted signals to be introduced onto a transmission circuit.
Link - A circuit or transmission path, including all equipment, between a sender and a receiver. A logical connection between two nodes consisting of one or more T1/T3 trunks.
Link Cost - See routing cost.
Link ID - Links are identified through the Operator Interface by indicating the nodes connected by a link. For example, the link between Nodes 5 and 7 is referred to as N5N7 or N7N5.
LINT - line interface number
LIP - large internet packet
LIPS - logistics information processing system
LIRCM - large (aircraft) infrared countermeasures
Listed Directory Number - See LDN
LITE - Lightweight Integrated Telecommunications Equipment
LITINT - literature intelligence
LIU - LAN interface unit
LIU - line interface unit
LIWA - land information warfare activity
LKG - Loop Key Generator
LKGI - loop key generator interfaces
LKM - local key manager
ll - numbers
LLC - logical link control
LLCSC - lower level computer software component
LLDT - load local descriptor table
LLLTV - low light level television
LLP - lower layer protocol
LM - loop modem
LMD - loop group multiplexer and demultiplexer
LMDS - Local Multi-point Distribution Service
LMF - language media format
LMI - (Local Management Interface) - A protocol used for controlling the connection between the User and the Network.
LMR - land mobile radio
LMRDFS - lightweight man-transportable radio direction finding system
LMS - lightweight modular shelter
LMSS - land mobile satellite system
LMST - lightweight multiband satellite terminal
LMSW - load machine status word
LMU - local management unit
LN - link node
LNA - local network attachment
LNA - low noise amplifier
LNE - Late Net Entry
LNO - Liaison Officer
LNP - Local Number Portability
LNS - leader node switch
LNX - flood search numbering plan prefix
LNX+XXXX - format for a MSE user's telephone number
LO - low
LOAC - Laws of Armed Conflict
Load - Unit - A measure of the processing capability of each processor (PPM and PLM) module.
LOC - lines of code
LOC - local
Local Access and Transport Area - See LATA.
Local Exchange Carrier - See LEC and CLEC.
Local Loop - A diagnostic technique that loops data out to local cable and terminal equipment to isolate failures.
Local UI - A user Interface application resident on the same machine as SSIMP-LR Main.
LOCE - Linked Operations Intelligence Capability-Europe
LOCIS - Library of Congress Information System
LOCK - logical coprocessor kernel
LOF - lowest operating frequency
log - logistics
LOGAIS - logistics automated information system
Logical Slots - A measure of the bandwidth amount required for the operation of a specific module. Each shelf in a node can support a specific number of logical slots.
LOI - loss-of-input
LOICE - Link Operations Intelligence Center-Europe
Long Distance - 1. If your local Telco is a former Bell Operating Company then any call outside of your LATA or any Interstate call is considered long distance and is handled by an IEC 2. If your local phone company is an independent then only interstate and inter-phone company calls are considered long distance. The above is true regardless of whether you are referring to a dedicated line or a dial up call 3. However, under the current state of deregulation, toll calls within a LATA may now be covered by the IEC, and in some cases RBOCs are being permitted to handle InterLATA calls.
LOOP - MUX loop multiplexer
Loop - 1. A diagnostic technique that loops data out or in to the equipment to isolate failures. 2. The telephone circuit from the CO to the customer's premises. Generally refers to a copper cable circuit.
Loop Qualification - Process of actually measuring the loss on a prospective ISDN line to see if it can be used for ISDN service . The actual loss on the line determines whether ISDN service can be offered without a repeater. Generally ISDN is available up to 18,000 feet from the serving Central Office. It may not be available within this range, or may be available further from the CO. Only a loop qualification can tell for sure. Not all Telcos will extend ISDN lines with Repeaters.
Loop Start Line - A plain old telephone line. The telephone terminal signals the "off hook" condition by allowing DC current to flow. See Ground Start Trunk. See also Glare.
Loop Start Trunk - A plain old telephone line connected to a PBX switch. See Loop Start Line. The PBX signals the "off hook" condition by allowing DC current to flow. Ground Start Trunks are generally preferred for use on PBXs to prevent glare. See Ground Start Trunk. See also Glare.
Loop Timing - Loop timing indicates that the transmit and receive frame bits are synchronized. When the operator selects the Loop Timing parameter, the voice card obtains it’s transmit and receive clock from the incoming bit stream.
Loop-in - A transmission capability in which the received signal is returned (looped in) to the network.
Loop-out - A transmission capability in which the received signal is returned (looped out) to the physical interface. In the SDMS port 0 bundle context, the meaning of loop-out is straightforward. In the subrate port context, it is confusing because DSMS ports have no physical interface; data is looped back towards the remote data port. To the remote QSD port, this looks like a loop-in.
Loopback - A transmission capability in which the received signal is returned (looped back) to the sender.
LORAN-C - Long-Range Aid to Navigation
LOS - line of sight
LOS - loss of signal
LOSH - line of sight (high capacity)
LOSL - line-of-sight link
LOSM - line of sight (Marine Corps)
LOW - link orderwire
LOW - link orderwire
LP - linearly polarized (mode)
LP - linear programming
LP - linking protection
LP - log periodic (antenna)
LP - BK loop back
LP - listening point
LPA - linear power amplifier
LPC - linear predictive coding
LPC - longitudinal parity check
LPCK - Loop Clock
LPCS - lateral parent COMSEC switch
LPD - low probability of detection
LPD - Line Printer Daemon (protocol)
LPD - amphibious transport dock
LPE - low probability of exploitation
LPI - low probability of interference (intercept)
LPP - line printer/plotter
LPU - line printer unit
LPVM - legacy PTT voice module
LQA - link quality analysis
LRAU - local radio access unit
LRC - longitudinal redundancy check
LRDM - low rate data multiplexer
LRF - laser rangefinder
LRI - limited range of intercept
LRM - language reference manual
LRM - low rate multiplexer
LRM - low rate modem
LRSU - Long Range Surveillance Unit
LRU - line replaceable unit
LS - LKG selector
LS - light stream
LS (Low Speed) Trunk Module - A bandwidth efficient trunk module primarily used as a low bandwidth trunk.
LS - low speed
LSB - least significant bit
LSB - lower sideband
LSC - least significant character
LSCDM - Low-Speed Cable Driver Modem
LSD - large screen display
LSD - least significant digit
LSD - large screen display
LSD - landing ship, dock
LSDIS - light & special division interim sensor
LSE - local subscriber environment
LSI - Large-Scale Integration
LSL - link support layer
LSMS - local service management system
LSP - Logistics Support Package
LSPR - Low-Speed Pulseform Restorer
LSRD - Loop Start Ringdown
LSRR - loose source and record route
LSSC - Logistics Systems Software Center (Army)
LSTDM - low-speed time division multiplexers
LT - laser transmitter
LT - local terminal
LTBF - Local Timing Buffer
LTC - line traffic coordinator
LTE - Late Traffic Entry
LTG - Local Timing Generator
LTM - Line Termination Module
LTOIV - latest time of intelligence value
LTU - Line Termination Unit
LTU - TCTC transmit cipher text clock, transit case technical control
LU - logical unit
LUA - logical unit application
Lucent Technologies - Company which now makes the former AT&T 5ESS switch, as well as various other pieces of Telco gear and semiconductors. Lucent was split off from AT&T in 1996 and owns Bell Labs. As of approximately 1999 Lucent sold their telephone set manufacturing business (and the right to use the AT&T name on telephone sets) to V-Tech. V-Tech is using the AT&T name and line as their high-end line.
LUF - lowest usable frequency
LUT - look up table
LVDTC - local video display terminal controller
LVM - large voice module
LWIR - long wave infrared
LWIRJ - long wavelength infrared jammer
LWSD - large wall screen display
LWX (LAN/WAN Exchange) Module - This module provides an internetworking connection between geographically separated LANs (local area networks) to connect to a WAN (wide area network).
LZ - landing zone
[ Numerics | 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 ]