B&B Electronics 855-10260--74 - Manual User Manual
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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
NOTE
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
Switch
Twisted Pair
LEDs
Fiber
LEDs