HP 480 manual Figure D-3. Example of Dual-Homed Connection

FDDI Cable Attachment Configurations

Dual-Homed Connection

Dual-Homed Connection

Backup

FDDI Concentrator

... ... ...

A B

Primary

FDDI Concentrator

...

A B

M M M MM M M M

A B

HP router with FDDI port

Figure D-3. Example of Dual-Homed Connection

This configuration:

avoids the need for an optical bypass switch (page 1-19)

provides redundancy so that failure of one cable or concentrator will not break the router’s connection to the dual ring

During normal operation in the above example, traffic is sent and re- ceived over port ‘‘B’’ of the router. Port ‘‘A’’ is used only if the cable or concentrator attached to port ‘‘B’’ fails.

1.Attach port ‘‘A’’ of the to an ‘‘M’’ port of a concentrator.

2.Attach port ‘‘B’’ of the router to an ‘‘M’’ port of another router.

D FDDI Cable Attachments

D-5