Alloy FCR200 사용자 설명서 - 페이지 7

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FCR200xx User Manual

6. Link Failure Propagation

Link Failure Propagation (LFP) is a function that propagates the failure of link to the

connecting media converter. If link is lost on either the copper or the fibre ports on media

converter A, both copper and fibre link will then be lost on media converter B. LFP uses the

Far End Fault (FEF) feature of the fibre interface to perform this function.

Unlike the LFP - Far End Fault method the new Advanced LFP feature allows the media

converter to propagate the link failure to active fibre devices, such as switches. With FEF, the

LFP functionality would only work when connected to another device that supported FEF,

such as another media converter. Know the same functionality can be used when

connecting to Fibre Optic switches. When the copper port of the media converter loses link

the Fibre port also loses link forcing the link on the switch to also fail. Both LFP features can

be enabled or disabled using the DIP switches on the side of the media converter. When

disabled the media converter will act as normal, e.g. if the fibre port loses link the copper

port will still have an active link and vice versa.

Fig. 8 Normal status via a pair of LFPs

Fig. 9 The status if TP Cable A is broken

Fig. 10 The status if Fibre Cable B or C is broken

Note: LFP will only function if both devices support this feature. LFP will not function on this

media converter if it is connected to a network switch that does not support the LFP

Function. In most cases these will need to be used in pairs.