Multi-Tech Systems MTASR3-200 Manual de usuario descargar pdf (Pagina 77)

Glossary

MTASR3-200

Long Haul Communications: The type of phone call reaching outside of a local exchange (LE).

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 responibility.

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 telephone line. It converts the

computer’s digital signals into analog signals to send over a telephone 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.

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.

Multiprotocol: A device that can interoperate with devices utilizing different network protocols.

MultiRouter: A secure gateway that provides multiple LAN users with high performance Internet access by functioning as a

TCP/IP MultiRouter that resides on the outer edge of a firewall.

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 befor the next transaction

processing is started.

Nailed Connection: A permanent or dedicated circuit of a previously switched circuit or circuits.

Nailed-up Circuit: A semi-permanent 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.

Object-Oriented: 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 telephone 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 telephone

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 the Internet. OSPF incorporates least-cost routing, equal-cost routing, and load balancing.

Outage: The measure of the time during which a circuit is not available for use due to service interrupt. Outage is the

complement of circuit “availability” (100% minus % available = % outage).

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