Cabletron Systems BRIM-F6 manual Figure A-8. Duplex Fiber Optic Receptacles and Connectors

FDDI Devices

FDDI devices physically attach to the ring using Fixed Shroud Duplex (FSD) media interface connectors. The X3T9.5 Physical Layer, PMD standard defines four connector types (see Figure A-7). These connectors provide proper trunk fiber alignment for each of the valid configurations.

Types A, B, and M provide precision connection (i.e., mechanical keying to assure proper connection to Primary-In and Primary-Out fibers). Types A and B allows dual attachment to the primary and secondary data paths of the main ring. Type M allows for single attachment stations, at a concentrator end of the SAS lobe.

The Type S connector has a wide, centrally located, keyway provides non- precision connection (i.e., for SAS lobe attachment).

FDDI RECEPTACLES		FDDI CONNECTORS
PRIMARY IN	SECONDARY OUT

TYPE A

Type A

Dual

DUAL
Attachment
ATTACHMENT	SECONDARY IN	PRIMARY OUT

TYPE B

	IN	OUT
		TYPE M
Single
SINGLE
ATTACHMENT
Attachment	IN	OUT

TYPE S

Type B

Type M

Type S

Figure A-8. Duplex Fiber Optic Receptacles and Connectors

BRIM-F6 User’s Guide Page A-11