|Acronyms & Abreviations
1000 Megabits per Second, Baseband, Twisted Pair
100 Megabits per second, Baseband, Twisted pair
100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
100 Voice Grade (IEEE 802.12 AnyLAN Standard)
10 Megabits per second, Baseband, Twisted pair
Single line, Flat Business rate
Third-Generation High-Speed Packet Access
Third Generation Internet Protocol
Third Generation Partnership Project
Third Generation Partnership Project 2
Third-generation Global System for Mobile (communications)
Three Way Calling
Third Wire Open
Four Wire Analog
Four-Wire Analog Interface
Four-Wire Ear and Mouth
High data Rate IEEE 802.11 Wireless LAN protocol
8 Phase Shift Keying
Authentication, Authorization and Accounting
ATM Adaptation Layer
ATM Adaptation Layer 5
Abis Interface Port Control
Assorciated Control CHannel
Adaptive Enhanced Cell Identity
logical network handled by the OAM system and defined by the approved
IPaddresses. One or more Access Domains makes up an EDA network, which
is a switched Ethernet. An Access Domain is managed by one Collection Station.
Access Provider owns the physical network, installs equipment and
monitors network status and provides the basis for offering services to
Management tracks usage of services in the network in order to handle
billing or disable services for exceeded accounting limits. See also
Call Distribution, Typically used for a call center where a number of
ACD agents answer incoming calls in the order they arrive in the queue.
Advanced Communication System
Additional Directory Number
Adaptive Differential Pulse Code Modulation, a type of voice codec.
Asymmetrical Digital Subscriber Line
Asymmetrical Digital Subscriber Line 2 Plus
Alarm Indication Signal
Acoustic Echo Cancellation
128-BIT Advanced Encryption Standard
Automatic Frequency Correction
Access Grant CHannel
A Interface Common Procedure
Automatic Level Control
Adaptive Multi Rate
Adaptive Multi Rate Full Speed
Adaptive Multi Rate Half Speed
Automatic Network Call Distribution, an ACD system which is distributed over a private network.
Automatic Noise Restraint
American National Standards Institute
Angle of Arrival
Advanced Power Module
Access Point Name
Private Network Signalling System, an older type of private networking
where the network signalling is conveyed via a modem connection.
ATM PON (Passive Optical Network). This was the first Passive optical network
standard. It was used primarily for business applications, and was based
on ATM. See also BPON and GPON.
Automatic Protection Switchback
Resolution Protocol. A method for finding a host's Ethernet address
from its Internet address. An ARP request is sent to the network naming
the IP address; then the machine with that IP address returns its
physical address so it can receive the transmission.
function, embedded in an Ethernet device, that answers ARP requests on
behalf of other devices. Used in switching and bridging equipment to
limit broadcast traffic. Using one machine to respond to ARP (Address
Resolution Protocol) requests for another machine.The proxy machine
routes transmission packets to the proper destination.
Requests, broadcasted within Ethernets in order to get MAC addresses to use for transmission towards known IP addresses.
American Standard Code for Information Interchange
Transfer Mode. A network technology that enables the transmission of
data, voice, audio, video, and frame relay traffic in real time.
Advance Technology Attachement, ATA is a standard hard disk bus interface.
Asynchronous Transfer Mode
Analog Telephone Set
In a hierarchical telecommunications network the backhaul portion of the network comprises the intermediate links between the core network, or backbone network and the small sub-networks at the "edge" of the entire hierarchical network.
A GUI client for handling backup of data in the PEM system.
Back Administration Module
Traditional analog telephony as supplied from a local exchange. See also POTS.
Baseband Control Unit
Broadcast Control CHannel
Bit Error Probability
Bit Rate Error
transport service, defined in IEEE 802.1Q and normally used for
transfer of data when no special requirements to Quality of Service
(QoS) are specified.
Bidirectional Forwarding Detection
Base station Interface Unit
Broadband Loop Emulation Service. A method using ATM with AAL2 adaptation layer encapsulation, recommended by ATM Forum.
Basic Module Active Codec Type
BM Resource Control
Bill Of Materials
Basic Rate Access
Basic Rate Intrerface (ISDN 2B+D)
Broadband PON is a standard based on APON. It adds support for WDM,
dynamic and higher upstream bandwidth allocation, and survivability. It
also created a standard management interface, called OMCI, between the
OLT and ONU/ONT, enabling mixed-vendor networks. See also APON and GPON.
Remote Access Server. A BRAS is a multi-service access node to manage
IP service access for a large number of subscribers. See also VLAN.
A transmission bandwidth higher than 2Mbps.
Base Station Controller
Base Station Identity Code
Base Station Subsystem Application Part
Base Station Subsystem Application Part Plus
Base Station System GPRS Protocol
Base Transceiver Station
BTS Common Processing
BTS Transmission Resource Control
Burst Tolerance (BT)
The maximum time for which the source may transmit the PCR.
BSSGP Virtual Connection
BSSGP Virtual Connection Identifier
Carrier Ethernet 2.0 / CE 2.0 MEF Certified
Service Providers to certify that their E-Line, E-LAN, E-Tree and/or
E-Access services are compliant with the relevant MEF specifications
Equipment Vendors to certify that their products support delivery of
E-Line, E-LAN, E-Tree and/or E-Access services through compliance with
the relevant specifications
The Carrier Ethernet 2.0
certification program is a continuation of the highly successful MEF
Certification Program that began in 2005 and has resulted in over 1,000
services and devices certified as MEF 9, MEF 14 and MEF 18 compliant.
Designates highly reliable equipment intended for use in telecommunication (central office and backbone installations).
Channel Associated Signalling
Cordless Advanced Technology - Internet and Quality
Constant Bit Rate
Call Center Manager
Common Channel Signalling
Country Code Top Level Domain
Content Distribution Network
The unit of data, transferred as an entity through an ATM network. A cell has a fixed length of 53 bytes.
Building with telecommunication equipment. Also referred to as CO.
Call Information Logging
Class 5 services
supplementary services, provided by a local exchange, as opposed to
Class 4 services, provided by a PBX. Class 5 services are services like
Call Hold, Call Forwarding, Call Waiting, Call Transfer, 3tpy and
Calling Line Identification Presentation
Configuration Management Express
Central monitoring unit type A
Central monitoring unit type E
Co-Operation and Maintenance
Co-Radio Network Planning & Radio Network Optimization
Co-Radio Resource Management
The network monitored by a Collection Station. In EDA identical with the Access Domain.
Collection Station (CS) is a remote point in a distributed installation
of HP OpenView Network Node Manager (NNM). Multiple Collection Stations
can connect to a Management Station to form an NNM distributed
system. When the HP OpenView NNM is installed on a server it is
configured to be either a Management Station or a Collection Station.
The Collection Station software is installed on the Domain Server.
logical group of parameters with specific values. An operator can set a
number of parameters in one operation. A Configuration can be compared
to a profile or a template.
configuration of resources in PEM and the network elements, both in
terms of viewing, setting and backing up configuration parameters.
Examples are network engineering, software upgrading, managing end-users
and services, backup/restore, discovery of new resources in the network
and keeping an inventory list.
Customer Premises Equipment
Common public radio interface
Computer Supported Telecommunication Applications
Computer Telephony Integration
Digital Adapter for Subscriber Loop, DASL is the line interface for Digital telephones.
Digital Access Signalling System
database contains all data related to the IP DSLAMs, subscribers,
end-users and O&M Operators. The database is a standard SQL Sybase®
database. A Network Management System (NMS) can retrieve data from the database through the NMS server.
Dynamic Bandwidth Allocation
Direct current distribution unit
Data Communication Equipment
Digital Enhanced Cordless Telecommunications, see also CAT-IQ
The Dynamic Host Configuration Protocol (DHCP)
is an Internet protocol for automating the configuration of computers
that use TCP/IP. DHCP can be used to automatically assign IP addresses,
to deliver TCP/IP stack configuration parameters such as the subnet mask
and default router, and to provide other configuration information such
as the addresses for printer, time and news servers. In EDA the
Re. the CPE equipment, a DHCP server shall be available somewhere in the ISPnetwork to provide IP addresses for the IADs.
the Access Domain/Domain subnet, there shall be access to an Access
Domain DHCP server to provide IP-addresses for the Elements in the
Access Domain/Domain subnet server.
Host Configuration Protocol server. A configuration server, capable of
configuring hosts with a variety of information required for their
operation. In EDA there is one or more DHCP servers for each Access
Direct In Dialing
Distributed In, Distributed Out
priority based approach to providing transport services with distinct
QoS in packet based networks. The differentiated services approach
relies on each network element to invoke the network QoS policy hop-by-hop.
Direct Inward System Access
Do Not Disturb
Dialed Number Information Service
Domain Name System
Domain Server is a server computer that handles part of the network
managed by PEM. The Domain Server will host an NNM Collection Station
and a Domain Service (which links the application software to NNM), and
probably also a DHCP Server and a Domain File Server.The DHCP Server and
the Domain File Server can be installed on separate server computers.
Also referred to as PEM Domain Service has two functions: Interface between NNM and the other EDA specific
elements and interface between the EDA servers and the IP DSLAMs (a
protocol converter between CORBA and SNMP). There are two types of
Domain Services: PEM Management Domain Service, and PEM Access Domain
Service. The two types are identical; the name only refers to their placement in the EDA system.
Denial of Service
Digital Private Networking Signalling System, a signalling system used between PABX's.
Refers to Digital
Subscriber Lines DSL technologies use sophisticated modulation schemes
to pack data onto copper wires. They are sometimes referred to as
last-mile technologies because they are used only for connections from a
telephone switch to a home or office, not between switches.
Digital Subscriber Line Access Multiplexer
Dual Tone Multiple Frequency
Digital Telephone Set
ADSL option, enabling establishment of two separate physical channels
with different characteristics on an ADSL line. The characteristics in
question are bit error rate and delay, which are traded off against each
other. Optimizing one deteriorates the other.
2 Mbit/s interface (ETSI)
"E-Band" lies in the extremely high frequency
bands from 71 to 76 gigahertz (GHz), 81 to 86 GHz and 92 to 95 GHz. It
is being used for short range, high bandwidth communications (see also V-Band).
Enhanced Cell Identity
Ear andMouth (Tie Line Signalling), line signalling for basically analog tie lines.
Ethernet Access Node
External Call Forwarding, the ability to forward incoming calls to subscribers in the PSTN.
European Computer Manufactures Association
Ethernet Controller Node
Official product name for the EDA product.
EDA Core System
Mandatory parts of an EDA access system.
Ethernet DSL Node comprises EDN110 and EDN312.
European Selective Paging manufacturing Association
Ethernet DSL Filter
node that connects the switched Ethernet of the EDA with the backbone
network (can be either data network or telephony network).
Ethernet DSL Node
Environment monitoring unit type A
end-user is a consumer of services in the access network. The end-user
is physically connected to the network and is uniquely identified in
PEM. Services are given to and removed from end-users.
is typically also referred to as Network Engineering. The work prior to
the network goes into operation. (Engineering is not part of FCAPS).
Engineering includes: Network planning, (IP addresses, usage and
location of Domain Servers), installation of equipment (switches, IP
DSLAMs, servers), initial configuration of equipment (assigning IP
addresses, subnet, defining management VLAN), "loading" equipment into
the management system. Once the Engineering is done and the equipment is
ready to go into service, Configuration Management will take over.
Engineering is executed by Network Managers.
Ethernet over SDH
Ethernet Private Line
Ethernet Power Node
Embedded power system
Enhanced Packet forward Unit
Erlang is a unit of measurement for telephony traffic. One Erlang corresponds to one telephony connection.
Ethernet Access Node
EAN is a logical node built on the ECN320 switch with built-in EMP
function. To create a EAN a number of ESN108 switches and 10-lines or
12-lines IP DSLAM are connected to the ECN320. The nodes are embedded in
the sense that all management are done by the ECN320. The EDN288 IP
DSLAM is an example of an
Ethernet Power Node
Power supply for Power over Ethernet (PoE) devices comprises EPN124 and EPN102.
European Telecommunications Standards Institute
European Registry for Internet Domains
Ethernet Virtual Private Line
Ethernet Converter Node
Management (FM) covers the area of viewing and handling alarms coming
from the PEM or the managed network. Also logging, filtering and
correlating alarms are handled within this functional area.
The term covers different functional areas within the discipline of network management.
Federal Communications Commission of the United States
Frequency Division Duplex
Fiber Distributed Data Interface
Frequency Division, Multiple Access
Fast Ethernet to E1 converter used for small sites in for example a back-to-back transmission solution.
Free and Open Source Software
The unit of data, transferred as an entity through an Ethernet.
Facility Restiction Level / Traveling Class Mark, also referred to as Trunk Call Barring, the FRL/TCM enables selective restriction of outgoing traffic according to each users FRL/TCM value.
File Transfer Protocol
Foreign Exchange Station
The voice codec standard normally used for telephony in digital exchange equipment within the switched circuit network.
Geographical Area Description
Gigabit per second
Global Information System
Gateway Mobile Location Center
Global Navigation Satellite System
Gigabit PON) is an evolution of the BPON standard. It supports higher
rates, enhanced security, and choice of Layer 2 protocol (ATM, GEM,
Ethernet). See also APON and BPON.
Global Positioning System
Global System for Mobile Communications
Global Systems for Mobile Communications Association
Global Symposium for Regulators
A suite of protocols, standardized by ITU for use in multimedia applications, for example Voice over IP (VoIP)
Heater assembly unit
Hert Power Monitoring Interface unit
Hewlett Packard Open View - a term for packages used for viewing networks.
Hyper Text Transfer Protocol
Integrated Access Device - a generic term for various customer equipment.
Integrated Backup Battery System
Information and Communications for Development
Information and Communication Technology
Infocomm Development Authority of Singapore
Inter-American Development Bank
International Domain Name
Institute of Electrical and Electronic Engineers
Internet Engineering Task Force
that the ADSL/IP also has voice (Voice over IP) transmission within the
ADSL/IP signal. This is called Telephony over IP. See also Baseband.
GUI based manager for addition, replacement and removal of IP DSLAM and
FE-E1 data from the system. The Installation Manager is a client of the
Installation Server, and is installed on the Management Center. The Installation Manager is aimed at the Access Provider.
This server interfaces between the EDA GUI’s, Database, IP DSLAM (through the PEM Domain Service) and NNM.
Protocol converter function, embedded in gateways and IADs.
International Mobile Satellite Organization
The cornerstone in the EDA solution a small, compact DSLAM (EDN108 and EDN110).
IP DSLAM port
A single DSL interface in the IP DSLAM (EDN108 and EDN110).
IP Multi-Service Access Node
Internet Protocol / Multi-protocol Label Switching
Internet Protocol Television
Integrated Services Digital Network
International Standardization Organization
International Telecommunications Satellite Organization
International Telecommunication Union
ITU – R
International Telecommunication Union Radio communication
Internet Exchange Point
Local Area Network
The amount of time it takes a packet to get to its destination.
LCS Application Protocol
Light Emitting Diode
Grouping parallel Ethernet links into a single logical link. Defined in IEEE 802.1 ad.
Local maintenance terminal
Last Number Redial
A feature of Link Aggregation, distributing the load over the grouped links.
physical line traditionally used for POTS telephony, that is, the
copper connecting subscribers to the central office installation.
LTE Positioning Protocol
Notation of connector from KRONE. Available as LSA-PLUS 8 and LSA-PLUS 10 for mounitng on a Back-Mount frame.
of connector from KRONE. Available as LSA-Profile 8 and LSA-Profile 10
for mounting on a Profile Rod or a Backmount frame.
Compact POTS filter in a similar mechanical design as the IP DSLAM.
LTE, or Long Term Evolution, is the global standard for the fourth
generation of mobile networks (4G) supported by all major players in the
industry. LTE offers the capacity and the speed to handle a rapid
increase in data traffic with close to 5 billion mobile broadband
subscriptions in 2016. For the key facts, please click here
Machine to Machine
Media Access Control
Media Access Control address. The physical address of a device connected to a network, expressed as a 6 byte hexadecimal number.
Work Station (PC) used for running manager applications.
The network managed by a Management Station (also through Collection Stations).
The core of the PEM, which contains the database, PEM application servers and HPOV Management Station.
Management Station is the central point in a distributed installation
of HP OpenView NNM to which multiple Collection Stations can connect.
When the NNM is installed on a server it is configured to be either a
Management Station or a Collection Station.
Megabit per second
Maximum Burst Size is the maximum number of cells for which the source may transmit the Peak Cell Rate.
Main Distribution Frame
Main Distribution Module
Minimization of Drive Tests
The MEF, as the defining body for Carrier Ethernet is a global industry
alliance comprising more than 200 organizations including
telecommunications service providers, cable MSOs, network
equipment/software manufacturers, semiconductors vendors and testing
organizations. The MEF’s mission is to accelerate the worldwide adoption
of Carrier-class Ethernet networks and services. The MEF develops
Carrier Ethernet technical specifications and implementation agreements
to promote interoperability and deployment of Carrier Ethernet
worldwide. For further details, please click here.
MAC Encapsulation Routing
Multiple In, Multiple Out
Mobility Management Entity
Man Machine Language, industry standard command line language used to manage telecommunications network elements.
Multimidia Messaging Service
Multi-Service Access Node
Mean operation Time Between Failures
One line card provides both VDSL2 and ADSL/ADSL2/ADSL2+ configurable per line
Network Address and Port Translation
Address Translation. A method that allows a multiple number of
computers within a local network to connect to the Internet though one
IP address.Network Address Translation can also act as a firewall by
preventing outside computers from connecting with the local network,
unless it is a connection initiated from within the local network.
National Broadband Network
National Emergency Number Association (US)
Network Configuration Manager is a GUI used for management of IP DSLAMs
and their related servers (Domain File Server and DHCP Server). The
Network Configuration Manager is a client of the Network Configuration Server, aimed at the Access Provider.
Network Configuration Server, this server interfaces between the GUI’s, database, IP DSLAMs (through the PEM Domain Service) and NNM
Network Operator is an individual working in the Access Provider
organization. The Network Operators are responsible for managing and
maintaining the access network, for example installation of new
equipment and alarm monitoring.
for Network Management System. An overlaying management system that can
interact with the PEM through the North bound interface.
for Network Node Manager, an HPOV package for viewing a network
topology, managing fault and performance data. Available as a collection
station (CS) or Management Station (MS).
Non-Real-Time Variable Bit Rate
Operation and maintenance
Optical Line Terminal
Operation and maintenance center
Center where Operation and Maintenance takes place.
Operator is a person or an IT system that can access the PEM system. An
Operator can log in to PEM and execute actions according to the
security profile defined for the Operator. Operator roles can be: Network Operator; Service Operator; Subscriber Operator.
Open Systems Interconnection
Operations Support System
Observed Time Difference of Arrival
Over Voltage Protection
Private Automatic Branch Exchange (see also PBX)
format in which data is transmitted over an IP network A packet
contains the data itself as well as addresses, error checking, and other
information necessary to ensure the packet arrives intact at its
Personal Digital Assistant
Private Branch Exchange (see also PABX)
Peak Cell Rate (PCR)
Peak Cell Rate is an ATM term which defines the maximum bit rate that
may be transmitted from the source. In EDA it is the maximum capacity
which the PVC is permitted to use.
Pulse Code Modulation
Public Ethernet Manager. PEM is the management system solution for the EDA.
PEM Access Domain Service
PEM Access Domain Service is the PEM Domain Service installed on a Domain server.
All PEM specific SW developed by Ericsson.
PEM Domain Service
See Domain Service.
PEM Management Domain Service
PEM Management Domain Service is the PEM Domain Service installed on a Management server.
Personal Identification Number
Public Land Mobile Network
Management (PM) is the area of tracking the usage of resources in the
network, typically communication links. Often the objective is to
support the capacity planning process and find bottlenecks in the
system. Data can be collected and stored, and an Operator can extract
the data and view them.
Power monitoring unit
Power over Ethernet
Passive optical network. See also APON, BPON and GPON.
Point of Presence which means the place where the Service Provider is present.
Plain Old Telephone Service.The standard analog telephone service.
Power over Ethernet
Power supplying devices through category 5, 6 and 7 LAN cables.
Point to Point Protocol. A protocol for communication between computers using
Point-to-Point Protocol over Ethernet. A small protocol for using PPP over Ethernet networks.
Primary Rate Access
Primary Rate Interface
Public Safety Answering Point
Public Switched Telephony Network
Power supply unit
Packet Transfer Mode
Public Ethernet Access
Common term for EDA, FEA, TAG and PEM solutions.
Permanent Virtual Circuit/Channel. A point-to-point connection in the ATM layer.
Quality of Service.
Quick Reference Guide
ISDN signalling over the Q-reference point
A place where a subscriber can buy for example an ADSL solution.
Remote Authentication Dial In User Service. An authentication and accounting system used by many ISPs.
Rain fade refers primarily to the absorption of a microwave radio frequency (RF) signal by atmospheric rain, snow or ice, and losses are especially prevalent at frequencies above 11 GHz. It also refers to the degradation of a signal caused by the electromagnetic interference
of the leading edge of a storm front. Rain fade can be caused by
precipitation at the uplink or downlink location. However, it does not
need to be raining at a location for it to be affected by rain fade, as
the signal may pass through precipitation many miles away, especially if
the satellite dish has a low look angle.
From 5 to 20 percent of rain fade or satellite signal attenuation may
also be caused by rain, snow or ice on the uplink or downlink antenna
reflector, radome or feed horn.
Radio frequency cabinet
Radio frequency unit
Remote radio unit
Remote Sub System
Compact clip-on POTS filter for the Ericsson
Reference Signal Time Difference
Real-time Transport Control Protocal
Real Time Protocol
Real-Time Variable Bit Rate
Secondary Access Right Identity (DECT)
Service Configuration Manager is a GUI used for handling end-users and
their IP services. The Service Configuration Manager is a client
application of the Subscriber server.
Small Computer System Interface
Synchronous Digital Hierarchy is the
physical layer in the ATM network.SDP
Session Description ProtocolSDR
Single Ended Line Test
GUI used for PEM user’s management.
The Security Server interfaces between the Security Manager and the database.
term Server in the PEM can be either a robust computer with high
specifications (as opposed to a workstation) or a SW application.
Service Broker is the organizational entity supporting the access
network with specific services, such as Internet or Video. The Service
Broker will make agreements with a number of Service Providers, to be
able to offer their services to end-users. Service Brokers are optional
in PEM and the Access Provider can act as a Service Broker. How this is
structured depends on customer preferences and organization.
Service Configuration is a setting of parameters defining a service to
be offered through the access network. A Service Configuration is used
as the basic template when applying the service to an end-user, and the
defined parameters will be common to all end-users subscribing to the
service. Parameter examples could be VLAN ID and priority.
Subscriber Identity Module
Session Initiation Protocol
Signal Lightning Protection Unit
Small- and Medium-sized Enterprise
Short Message Service
Service Operator is an individual working in the Access Provider
organization. The Service Operators are responsible for service and
Service Broker related issues within the Access Provider organization.
Service Provider - provider of services also called content provider, for example Internet
access service, contend services or firewall services. Service provider
equipment may be located anywhere in the network.
Serial Peripheral Interface
SUPL Location Platform
Single Input, Multiple Output
Serving Mobile Location Center
Short for Simple Network Management Protocol, a set of protocols for managing networks.
Short Message Service, a text message that can be send in a GSM or DECT network.
Simple Network Management Protocol
ISDN terminal interface
protocol specified in IEEE 802.1Q, allowing links to be physically
available but unused, until another link breaks. Spanning Tree creates a
tree structure without loops and changes this structure in case of
Sounding Reference Signal
Subscriber Set Identifier
A GUI client shows the line status of the IP DSLAM (8 or 10 lines) and the FE-E1 converter (4 lines).
Subscriber Operator is an individual working in the Service Broker
organization. The Subscriber Operators are responsible for handling
service related issues for subscribers and end-users within the Service Broker organization.
server interfaces between the GUI’s, 112 1/1551-HSC 901 35/3 Uen C
2005-12-02 database, IP-DSLAMs (through the PEM Domain Service) and NNM.
Secure User Plane Location
Sustainable Cell Rate (SCR)
The upper limit for the average cell rate that may be transmitted in the PVC.
1.5Mbit/s interface (ANSI)
Telephony Access Gateway
Telephone Application Programming Interface
Trans-Eurasian Information Super Highway Project
Trunk Call Discrimination
Total cost of ownership
Thermoelectric cooling unit
Transmission Control Protocol
Transmission Control Protocol / Internet Protocol
Time Division Duplex
Time-division multiplexing (TDM) is a type of digital (or rarely analog) multiplexing in which two or more bit streams
or signals are transferred appearing simultaneously as sub-channels in
one communication channel, but are physically taking turns on the
channel. The time domain is divided into several recurrent time slots
of fixed length, one for each sub-channel. A sample byte or data block
of sub-channel 1 is transmitted during time slot 1, sub-channel 2 during
time slot 2, etc. One TDM frame
consists of one time slot per sub-channel plus a synchronization
channel and sometimes error correction channel before the
synchronization. After the last sub-channel, error correction, and
synchronization, the cycle starts all over again with a new frame,
starting with the second sample, byte or data block from sub-channel 1,
Time division multiple access (TDMA) is a channel access method for shared medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. TDMA is a type of Time-division multiplexing (see also above), with the special point that instead of having one transmitter connected to one receiver, there are multiple transmitters. In the case of the uplink from a mobile phone to a base station this becomes particularly difficult because the mobile phone can move around and vary the timing advance required to make its transmission match the gap in transmission from its peers.
Time Difference of Arrival
Trivial File Transfer Protocol
Time Synchronization Server
Time Synchronization Server is used for setting the real time in the
system elements. The real time is used for making the time stamps in log
files and alarms, and in the IP DSLAM also for the Remote Storage. The
Server is optional in the Domain Server, but there must be a Time
Synchronization Server present in the system
Temporal Key Integrity Protocol
Transport Management Cabinet
Technology, Media, Telecommunications
Time of Arrival
Telephony over IP
service, accessible for the users of a network, providing consistent
and well defined transmission conditions in terms of for example
throughput, packet loss and delay.
Universal Access and Service
Unspecified Bit Rate
Universal Mobile Telecommunications System
The process of enabling competitive carrier access to the local loop in order to liberalize the telecommunications market.
Uniform Resource Locator
Universal Serial Bus
Uplink Time Difference of Arrival
User to User Information
including the option of supporting more than a single E1 system V5.2 A
standard for Local Exchange and Network Access Node interconnection,
using dynamic allocation of E1 timeslots as voice bearer media
The V band (vee-band) of the electromagnetic spectrum ranges from 50 to 75 GHz. The V band is not heavily used. The V band is also used for high capacity terrestrial millimeter wave communications systems. All communications links in the V band require unobstructed line of sight between the transmit and receive point, and rain fade must be taken into account when performing link budget analysis.
Very High Bit Digital Subscriber Line
Very High Bit Digital Subscriber Line 2 Plus
Virtual LAN. A method used to separate and group traffic within a physical LAN.
A numerical value identifying a certain VLAN.
Voice over Broadband
Voice over IP
Private Network. Secure communication between multiple networks or
network devices using insecure public networks, such as the Internet.
Very Small Aperture Terminal
Wide Area Network
Wireless Application Protocol
Wideband Code Division Multiple Access
Wired Equivalent Privacy
Weighted Fair Queuing
The Wi-Fi Alliance is a global non-profit industry association of
hundreds of leading companies devoted to seamless connectivity. With
technology development, market building, and regulatory programs, the
Wi-Fi Alliance has enabled widespread adoption of Wi-Fi worldwide. For further details, please click here.
Wireless LAN (Local Area Network)
Wi-Fi Protected Setup
World Radiocommunication Conference
World Summit on the Information Society
World Telecommunication/ICT Indicators Meeting