Cabletron Systems HSIM-W6 Guia de Instalação descarregar pdf (Página 54)

Appendix D: Glossary

D-2 HSIM-W84 Installation Guide

DTMF — Dual Tone Multi-Frequency. TOUCHTONE as opposed to Dial Pulse (DP).

DTR — Data Terminal Ready. RS-232 signal used for indicating to the DCE the readiness to

transmit and receive data.

EtherTalk — AppleTalk protocols running on Ethernet.

Filter — Feature to control the ﬂow of data based on protocol or bridge information. Filters can

be speciﬁc to allow data through or prevent transmission.

Firewall — A combination of techniques used to protect one network from unknown networks

and users on the outside. Firewalls can ﬁlter or block trafﬁc and act as a management and network

security point where all trafﬁc can be scrutinized.

Frame — A group of data generated by Data Link Layer operation.

IMUX (Inverse Multiplexing) — The process of splitting a single high-speed channel into

multiple signals, transmitting the multiple signals over multiple facilities operating at a lower rate

than the original signal, and then recombining the separately-transmitted portions into the original

signal at the original rate.

In-Band Signaling — Transmission within the frequency range used for data transmission; i.e.,

results in use of bandwidth normally reserved for data.

IP — Internet Protocol. A network layer protocol which allows a packet to traverse multiple

networks on the way to its ﬁnal destination.

IP Address — Internet address. A 32-bit address assigned to devices that participate in a network

using TCP/IP. An IP address consists of four octets separated with periods deﬁning network,

optional subnet and host sections.

IPX (Internet Packet Exchange) — A proprietary Network layer protocol developed by Novell

and used in NetWare networks.

Leased Line — A telecommunications line between two service points leased from a

communications carrier for private use, usually incurring a monthly service rate.

LEDs (Light Emitting Diodes) — Type of indicator lights on the panel of the router.

Local Area Network (LAN) — A network connecting computers over a relatively small

geographic area (usually within a single campus or building).

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Cabletron Systems HSIM-W6 Guia de Instalação Página 54