Chapter 5: Operation
5.5 Link Fault Pass-Through
LNK
TX
LNK
FL LNK
TIP
VDSL2
RING
LFPT
B
RAI
LNK FL
TIP
VDSL2
RING
LFPT
RAI
LNK
TX
LNK
When a 10/100BaseT port is lost, the unit sends a fault signal (RAI) to the VDSL line. If the LFPT function is enabled at the Far End VDSL port receiving this fault indication, the far end unit will drop the link on the 10/100BaseT port and BLINK the LFPT LED. This function must be enabled at both ends of the VDSL line for this to function in both directions. The LFPT function is only active in one direction at a time and is indicated by the flashing LED. As such, clearing the far end fault may uncover a fault at the local end.
5.6 Fault Loopback (FL)
B
FL LNK
LNK
TIP
TX | VDSL2 |
RING
LNKLFPT
RAI
| B |
LNK | FL |
TIP
VDSL2
RING
LFPT
RAI
LNK
TX
LNK
The Fault Loopback (FL) function will force the 10/100BaseT port to drop link if the VDSL line has lost link. If FL is enabled the LED will be ON GREEN and if this function is actively inhibiting the Ethernet port this LED will BLINK.
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