Multitech MultiVOIP 100 MVP110 User Manual page 90

Glossary
M
Management Information Base (MIB): A database of network management information used by the Common Management Information
Protocol (CMIP) and the Simple Network Management Protocol (SNMP).
Megacom: An AT&T service with a normal WATS line (typically T1) between the customer premise and the AT&T serving class 4 CO are
the customer's responsibility.
MegaLink: BellSouth's leased T1 service.
Message: Associated with such terms as packet, frame, and segment. 1. In information theory, an ordered series of characters intended to
convey information. 2. An assembly of characters and sometimes control codes that is transferred as an entry from an originator to one or
more recipients.
Modem: A communications device that enables a computer to transmit information over a phone line. It converts the computer's digital
signals into analog signals to send over a phone line and converts them back to digital signals at the receiving end. Modems can be internal
and fit into an expansion slot, or external and connect to a serial port.
Multicast: A process of transmitting from one source to many destinations. The actual mechanism may be different for different LAN
technologies.
Multiplexer (Mux): 1. A device that takes several input signals and combines them into a single output signal in such a manner that each of
the input signals can be recovered. 2. A device capable of interleaving the events of two or more activities or capable of distributing the
events of an interleaved sequence to the respective activities. 3. Putting multiple signals on a single channel.
Multipoint Conference: A conference between three or more terminals, which may be on the LAN or on the Circuit Switched Network.
Multipoint Control Unit (MCU): An H.323 endpoint on the LAN which enables three or more terminals and Gateways to participate in a
multipoint conference. The MCU includes a mandatory Multipoint Controller and optional Multipoint Processors.
Multipoint Controller (MC): An H.323 entity which provides for the control of three or more terminals in a multipoint conference.
Multipoint Processor (MP): An H.323 entity which provides for the processing of audio, video, and/or data streams in a multipoint
conference. The MP provides for the mixing, switching, or other processing of media streams under the control of the MC.
Multiprotocol: A device that can interoperate with devices utilizing different network protocols.
Multithreading: The ability of a software system to be able to handle more than one transaction concurrently. This is contrasted to the case
where a single transaction is accepted and completely processed before the next transaction processing is started.
N
Nailed Connection: A permanent or dedicated circuit of a previously switched circuit or circuits.
Nailed-up Circuit: A semipermanent circuit established through a circuit-switching facility for point-to-point connectivity.
NAK (Negative Acknowledgment): Communications code used to indicate that a message was not properly received, or that a terminal
does not wish to transmit. Contrast with ACK.
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 - Data Port (OCU-DP): The CO channel bank used as the interface between the customer's DSU and the channel
bank.
Off-hook: The condition of a device which has accessed a phone line (with or without using the line). In modem use, this is equivalent to a
phone handset being picked up. Dialing and transmission are allowed, but incoming calls are not answered. Contrast "on-hook".
Off Premise Extension (OPX): An extension or phone that terminates in a location other than that of the PBX. Commonly used to provide a
corporate member with an extension of the PBX at home.
Ones Density: the measure of the number of logical 1s on a T1 line compared to a given total number of bits on that line; used for timing
information in data recovery in AMI and B8ZS.
On-Hook: The condition of a device which has not accessed a phone line. In modem use, this is equivalent to a phone handset that has not
been picked up. In other words, it can receive an incoming call. Contrast "off-hook".
Open Shortest Path First (OSPF): A hierarchical Interior Gateway Protocol (IGP) routing algorithm for IP that is a proposed standard for
Internet. OSPF incorporates least-cost routing, equal-cost routing, and load balancing.
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