Interphase Tech RAS Communications Controller 5536 User Manual
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Glossary
216
Interphase Corporation
TEI (Terminal Endpoint Identifier)
The Terminal Endpoint Identi-
fier is used to identify a specific piece of equipment on an ISDN con-
nection.
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.
Tx
Abbreviation meaning transmit, transmitter, or transmission.
U Interface
The interface point between the user premises network
termination (NT1) and the local digital exchange.
UNI
See user to network interface.
User to network interface (UNI)
The interface between the ATM
end system (user) and the ATM network.
V.11
International interface recommendation electrically similar to
RS-422.
V.24
International interface recommendation that defines inter-
change circuits. Similar to and operationally compatible with RS-232.
(See
V.25
International interface recommendation for dial lines.
V.25 bis
International interface recommendation for dial lines that
includes an auto-dial command and response language.
V.28
International interface recommendation that defines electrical
characteristics for the interchange circuits defined by V.24. Similar to
and operationally compatible with RS-232. (See
V.35
International recommendation for a wide-band interface
modem.
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
networked computer typically reserved for end-user
applications.
X.21
(Packet-switched networks) International recommendation
that defines a physical interface for X.25, using a 15-pin connector
equivalent to V.11.