Multitech Multivoip 100 Model Mvp120 Voice/fax Over Ip Networks User Guide

91 Glossary
Multi-Tech Systems, Inc. MultiVOIP User Guide
Centrex:  A multi-line service offered by operating telcos which provides, from the telco CO, functions and features comparable to
those of a PBX for large business users. See also Private Branch Exchange, Exchange.
Channel:  A data communications path between two computer devices. Can refer to a physical medium (e.g., UTP or coax), or to a
specific carrier frequency.
Channel bank:  A device that acts as a converter, taking the digital signal from...

Data Communications Equipment (DCE):  Any device which serves as the portal of entry from the user equipment to a telecom-
munications facility. A modem is a DCE for the phone network (PSTN) that is commonly on site at the user’s premises. Packet
Switched Networks have another level of DCE which is most often located at a central office.
Data Link Connection Identifier (DLCI):  One of the six components of a frame relay frame. Its purpose is to distinguish separate
virtual circuits across each access...

93 Glossary
Multi-Tech Systems, Inc. MultiVOIP User Guide
EIA:  The Electronics Industries Association is a trade organization in Washington, DC that sets standard for use of its member
companies. (See RS-232, RS-422, RS530.)
Encapsulation:  A technique used by network-layer protocols in which a layer adds header information to the protocol data unit
from the preceding layer. Also used in enveloping one protocol inside another for transmission. For example, IP inside IPX.
Endpoint: The clients in an...

Foreign Exchange Station (FXS):  See FX, FXO. To generate a call from the computer telephony system to the POTS set, a  FXS
connection must be configured.
Forward Explicit Congestion Notification (FECN):  A bit that tells you that a certain frame on a particular logical connection has
encountered heavy traffic. The bit provides notification that congestion-avoidance procedures should be initiated in the same
direction of the received frame. See also BECN (Backward Explicit Congestion Notification)....

95 Glossary
Multi-Tech Systems, Inc. MultiVOIP User Guide
Inter Exchange Carrier (IEC):  The long distance company (LE) whos central office provides the point of reference for T1 access.
Any common carrier authorized by the FCC to carry customer transmissions between LATAs.
Internet:  Refers to the computer network of many millions of university, government and private users around the world. Each user
has a unique Internet Address.
Internet Address (IP Address):  A unique 32-bit address for a specific...

Local Access and  Transport Area (LATA):  A post-divestiture geographical area generally equivalent to a Standard Metropolitan
Statistical Area. At divestiture, the territory served by the Bell system was divided into approximately 161 LATAs. The Bell Operating
Companies (BOCs) provide  Intra-LATA services.
Local Exchange Carrier (LEC):  The local phone company which provides local (i.e., not long distance) transmission services.
AKA telco. LECs provide T1 or FT1 access to LDCs (unless the T1 circuit is...

97 Glossary
Multi-Tech Systems, Inc. MultiVOIP User Guide
Network:  A group of computers connected by cables or other means and using software that enables them to share equipment,
such as printers and disk drives to exchange information.
Node:  Any point within a network which has been assigned an address.
O
Object-Orientated:  A method for structuring programs as hierarchically organized classes describing the data and operations of
objects that may interact with other objects.
Office Channel  Unit -...

PRI (Primary Rate Interface):  Used on ISDN. In North America, and Japan, PRI is one 64Kbps D channel and 23 B channels.
Elsewhere, it is one D channel and 30 B channels. PRI is the ISDN equivalent of a T-1 circuit.
Primitive:  An abstract representation of interaction across the access points indicating that information is being passed between
the service user and the service provider. The OSI Reference Model defines four types of primitives: Request, Indication, Response
and Confirm.
PROM (Programmable...

99 Glossary
Multi-Tech Systems, Inc. MultiVOIP User Guide
Router:  A device that connects two networks using the same networking protocol. It operates at the Network Layer (Layer 3) of the
OSI model for forwarding decisions.
Routing Information Protocol (RIP):  A distance vector-based protocol that provides a measure of distance, or hops, from a
transmitting workstation to a receiving workstation.
RS-232-C:  An EIA standard for a serial interface between computers and peripheral devices (modem, mouse,...

100 Glossary
Multi-Tech Systems, Inc. MultiVOIP User Guide
T
Tariff:  The rate/availability schedule for telephone and ISDN services from a regulated service provider.
TCP/IP:  A set of communication protocols that support peer-to-peer connectivity functions for both local and wide area networks.
TCP/IP was developed by the US Department of Defense to link dissimilar computers across dissimilar and unreliable LANs.
T Carrier:  The generic name for a digitally multiplexed carrier system. In the North...