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MCSE Notes for Ethernet 100.

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11.2 100BASE-FX Components

MDI Connectors

The medium dependent interface (MDI) for a 100BASE-FX link may be one of three kinds of fiber optic connectors. Of the three, the duplex SC connector is the recommended alternative in the standard. The SC connector is designed for ease of use; the connector is just pushed into place and automatically completes the connection.

Another type of connector that may be used is a FDDI Media Interface Connector (MIC). This is a standard keyed connector used in the FDDI LAN system. MIC connectors are keyed in various ways, referred to as A, B, M, and S, to make sure that the FDDI cabling is connected properly. If a FDDI MIC is used as a 100BASE-FX MDI, the specifications state that it shall be keyed as an "M" receptacle. FDDI MIC connectors are also just pushed into place, and automatically complete the connection.

The third type of fiber optic connector that may be used is commonly called the ST connector. This is the same connector that is used on a 10BASE-FL link. It is a spring-loaded bayonet-type connector that has a key on an inner sleeve and also an outer bayonet ring. To make a connection, you line up the key on the inner sleeve of the ST plug with a corresponding slot on the ST receptacle, then push the connector in and lock it in place by twisting the outer bayonet ring.

Quick Reference Guide to 100BASE-FX - 09 SEP 95

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