Cabletron Systems Spectrum EMM-E6 Betriebsanweisung PDF herunterladen (Seite 35)

FDDI Devices

BRIM-F6 User’s Guide Page A-9

Figure A-6. Dual Homing Topology

Concentrator 3 in Figure A-6 has redundant connections to the main ring

through either concentrator 1 or 2. The FDDI connection rules only

permit one active connection, Port B. If a cable failure severs concentrator

3’s connection to concentrator 2, CFM activates Port A.

A.6 FDDI Devices

FDDI recognizes four station conﬁgurations (SAS, DAS, DAC, and

SAC). These conﬁgurations differ by the mix of FDDI entities within the

station (see Figure A-7).

All stations must have:

• one SMT

• at least one MAC

• one PMD

• one PHY.

Port A

Port APort A

Port B

Port MPort MPort MPort M

Primary

Connection

Backup

Connection

BRIM-F Book Page 9 Monday, January 29, 1996 9:26 AM

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Cabletron Systems Spectrum EMM-E6 Betriebsanweisung Seite 35