Overview. This standard defines the functional, electrical, and mechanical characteristics of the Medium Attachment Unit (MAU) and one specific medium for use with local area networks. The relationship of this specification to the entire ANSMEEE Std 802.3-1988 Local Area Network Specification is shown in Fig 10-1. The purpose of the MAU is to provide a simple, inexpensive, and flexible means of attaching devices to the local area network medium. This is achieved through the use of industry standard coaxial cables and BNC connectors.
10.1.1.1 Medium Attachment Unit (normally contained within the data terminal equipment [DTE]). The MAU has the following general characteristics
(1) Enables coupling the PLS to the explicit baseband coaxial transmission system defined in this section of the standard
(2) Supports message traffic at a data rate of 10 megabits per second (Mws)
(3) Provides for driving up to 185 m (600 ft) coaxial trunk cable segment with-out a repeater
(4) Permits the DTE to test the MAU and the medium itself
(5) Supports system configurations using the CSMNCD access mechanism defined in the ANSI/IEEE Std 8023-1988 Local Area Network Specification
(6) Supports a bus topology interconnection means
(7) Supports low-cost capability by incorporating the MAU function within the physical bounds of the DTE, thereby eliminating the need for an Attachment Unit Interface (AUI)
10.1.1.2 Repeater Unit. The Repeater Unit is used to extend the physical system topology and provides for coupling two or more coaxial trunk cable segments. Multiple Repeater Units are permitted within a single system to provide the maximum trunk cable connection path specified in 10.7. The repeater is not a DTE and therefore has slightly different attachment requirements.
10.1.2 Definitions. This section defines the specialized terminology applicable to MAUs and Repeater Units.
Attachment Unit Interface (AUI). (Optional) In a local area network, the interface between the Medium Attachment Unit (MAU) and the data terminal unit within a data station