Glossary

SS7 (Signaling System 7) This is a common channel signaling system used to establish ISDN call functions.

Switch Type The type of equipment that the telephone company uses to provide you with ISDN service.

synchronous transmission A data transmission scheme where the interval between transmitted characters is fixed so that start and stop bits are not required. As opposed to asynchronous transmissions, synchronous transmissions are guaranteed a specific percentage of bandwidth on the network medium.

TCP/IP (Transmission Control Protocol/Internet Protocol) A set of communications protocols that define how different types of computers talk to each other. It is the standard architecture for internetworking multiple organizations, and the common link that ties the huge Internet together.

TEI (Terminal Endpoint Identifier) The Terminal Endpoint Identifier is used to identify a specific piece of equipment on an ISDN connec- tion.

Telco Telco is a popular abbreviation for telephone company. The RBOCs are a subset of all Telcos.

T Interface The interface point between the user premises network termination (NT1) and a switching or concentration point (NT2) such as PBX.

U Interface The interface point between the user premises network termination (NT1) and the local digital exchange.

VN3/VN4 VN3 and VN4 are the French ISDN standards.

WAN (Wide Area Network) A network spanning a large geographical area that provides communications among devices on a regional, national, or international basis.

workstation A networked computer typically reserved for end-user applications.

X.25 Packet-switching protocol that lets computers communicate via wide-area packet-switched data networks.

iSPAN PRI PCI ISDN Users Guide

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