Multitech MTPSR1-202ST Guía de usuario descargar pdf (Pagina 97)

Glossary

MTPSR1-202ST

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 completely intra-LATA). Inter-LATA T1 circuits are made up of a combination of Access and

Long Haul facilities.

Local Management Interface (LMI): A specification for frame relay equipment that defines status

information exchange.

Local Loop: A transmission path, typically twisted-pair wire, between an individual subscriber and

the nearest public telecommunications network switching center. The wires provide ISDN service, but

require an NT1 at the user end and an LT at the network end. (AKA, “loop” or “subscriber loop”.)

Logical Link Control (LLC2): In a local area network, the protocol that governs the exchange of

transmission frames between data stations independently of how the transmission medium is shared.

The LLC2 protocol was developed by the IEEE 802 committee and is common to all LAN standards.

Logical Unit (LU): A type of network accessible unit that enables end users to gain access to

network resources and communicate with each other.

Long Haul: The T1 element that connects to the Access portion of the long distance company’s

(LDC’s) central office. The LDC is commonly called the point of presence (POP). Each LDC has a

number of POPs, located throughout the country. The LDC is also called an IEC (Inter Exchange

Carrier).

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 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 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 inter-

leaved 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.

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.

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.

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