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Glossary
iSPAN PRI PCI ISDN Users Guide 141
SS7 (Signaling System 7) ◆ This is a common channel signaling sys-
tem 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, syn-
chronous transmissions are guaranteed a specific percentage of band-
width on the network medium.
TCP/IP (Transmission Control Protocol/Internet Protocol) ◆ A set of
communications protocols that define how different types of comput-
ers 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 geographi-
cal 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.