DEC PORTswitch 900FP, Руководство по установке и настройке

Страница: 100 / 124

Fault Detection
A–10 Redundant-Link Configuration
Full Fault Detection
The PORTswitch 900FP supports full fault detection. When the
PORTswitch 900FP ports are connected to the ports of another repeater
that supports this feature, such as a DECrepeater 90FS, failures are
detected at either end of the receive or transmit link. See Figure A-4.
If the responder's receive port detects a link failure, the responder
signals the MCA. This allows the MCA to disable the active port and
enable the inactive port.
Figure A-4 Full Fault Detection Configuration
Item Description
1 Master port pair.
2 Primary link (initially active).
3 Single responder port (always enabled).
4 Secondary link (initially standby and disabled).
5 The master cannot detect a link failure here.
6 These ports may be on the same module or separate modules.