Cabletron Systems Spectrum EMM-E6 Guia do Utilizador descarregar pdf (Página 37)

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 OUTPRIMARY IN

TYPE A

PRIMARY OUTSECONDARY 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

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Cabletron Systems Spectrum EMM-E6 Guia do Utilizador Página 37