FDDI Devices
BRIM-F6 User’s Guide
Page A-11
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).
Figure A-8. Duplex Fiber Optic Receptacles and Connectors
Type B
FDDI RECEPTACLES
SINGLE
ATTACHMENT
TYPE S
IN
OUT
DUAL
ATTACHMENT
Type A
Type S
SECONDARY OUT
PRIMARY IN
TYPE A
PRIMARY OUT
SECONDARY IN
TYPE B
Type M
TYPE M
FDDI CONNECTORS
IN
OUT
Dual
Attachment
Single
Attachment
BRIM-F Book Page 11 Monday, January 29, 1996 9:26 AM
