# Glossary of terms

The following table describes the terms used in this manual:

Term | Definition
MD1 | Multiple DS1.
Mini RJ-21 connector | A high density 50-pin Telco connector.
Dialogic® MD1 Mini RJ-21 interface | A Mini RJ-21 connector with a pinout specified by Dialogic to have eight 4-wire T1/E1 connections.
RJ-21 connector | Physically, a 50-pin connector. Also referred to as a 50-pin Telco connector.
Dialogic® MD1 RJ-21 interface | An RJ-21 connector with a pinout specified by Dialogic to have eight 4-wire T1/E1 connections.
RJ-45 connector | A telephone connector that holds up to eight wires.
Dialogic® MD1 RJ-45 interface | An RJ-45 connector with a pinout specified by Dialogic to have two 4-wire T1/E1 connections.
RJ-48C interface | An RJ-45 connector with a pinout specified by ANSI to have a single 4-wire T1/E1 connection.
Connector | A physical device for making electrical connections.
Interface | A connector with a defined wiring pattern or specification.