Multitech MTPSR1-202ST Guía de usuario descargar pdf (Pagina 104)

ProxyServer User Guide

104

MTPSR1-202ST

Wide Area Network (WAN): 1. A network that provides communication services to a geographic

area larger than that served by a local area network or a metropolitan area network, and that may

use or provide public communication facilities. 2. A data communications network designed to serve

an area of hundreds or thousands of miles; for example, public and private packet-switching net-

works, and national telephone networks. Contrast with local area network (LAN).

Wide Area Telecommunications Service (WATS): A low-cost toll service offered by most long

distance and local phone companies. Incoming (800 call service, or IN-WATS) and outgoing WATS

are subscribed to separately, but over the same line.

X.25: ITU-T’s definition of a three-level packet-switching protocol to be used between packet-mode

DTEs and network DCEs. X.25 corresponds with layer 3 of the 7-layer OSI model.

Yellow Alarm: An error indication sent by the T1 device when it has not gotten a receive signal, or

cannot synchronize on the receive signal received. Contrast “Red Alarm” and “Blue Alarm”.

Zero Byte Time Slot Interchange (ZBTSI): A method for allowing 64 Kbps unrestricted user data

(allowing all 0s in the user data). An alternative to (but not as popular as) B8ZS.

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Multitech MTPSR1-202ST Guía de usuario Pagina 104