Link Fault Detection In Force Modes (Lfd) - IMC Networks McBasic 10/100 Operation Manual

Link Fault Detection in FORCE Modes (LFD)

Link Fault Detection (LFD) is only available when using Force 10 or Force 100 mode
and provides the same information as link fault pass through as does in PNP mode to
detect silent failures. When LFD is enabled and the input link is down at one
interface to the McBasic 10/100, the transmitter output on that interface is turned off
for about 425ms every 3.8 seconds (i.e., blinking). It applies to both network
interfaces and to both data rates. If the link at the other interface to the McBasic
10/100 is also down, there is no output. LFD causes the Link Up indicator of the link
partner to blink.
When the McBasic 10/100 is in one of the FORCE modes, enable LFD by setting S5
to the ON position. Disable LFD by setting S5 to the OFF position.
In order for LFD to function properly, Force mode must be enabled by setting:
•
S7 to ON with either S8 ON for 10 Mbps or S8 OFF for 100 Mbps
•
S6 must also be ON
When using the LFD feature, if the DIP Switches are in any other combination than listed
above, the McBasic 10/100 may exhibit erratic behavior.
Crossover/
Pass-through Twisted Pair
Switch LEDs
NOTE
Fiber
LEDs
6