User manual

Appendix A
42
Link Fault Pass Through (LFP, AKA. Link Loss Forwarding)
This media converter incorporates a Link Forwarding feature which allows indirect sensing of a Fiber or UTP
Link Loss via both the 100 Base-TX UTP and 100Base-FX connections. Whenever the media converter detects a Link
Loss condition on the Receive fiber (Fiber LNK OFF), it disables its UTP transmitter so that a Link Loss condition
will be sensed on the receive UTP port. (See the following figure) The link loss can then be sensed and reported by
a Network Management agent at the host equipment of remote UTP port. This feature is disabled by default.
Broken Fiber, remote receive
Remote UTP disconnected
Far End Fault (FEF)
The Far End Fault or FEF feature is a built-in part of the OAM.
Remote Rx fiber
Broken
Local Rx fiber
Broken
Remote Power
Failure
fiber
remote local
UTP disabled
condition forwarded
Link fault
sensed locally
fiber
broken
MC MC
fiber
remote local
UTP disabled
condition forwarded
Link fault
sensed locally
UTP
broken
MC
MC
fiber
remote local
FEF Led Lit FX Link Down
fiber
broken
MC
MC
fiber
remote local
Fault condition sent
via OAM to far end
FEF Led lit
fiber
broken
MC
MC
FX Link Down
Fault condition sent
via OAM to far end
remote local
fiber
Fault condition sent
via dying gasp
FEF Led lit
MC
MC
MC powered OFF