[e2e] Re: a problem...

[Darren Long]

If there is no information flow from  N2 to N1, how can you expect N1 to 
detect N2?

Darren

Puddinhead Wilson wrote:

>perhaps I should modify as someone asked for
>clarification,
>
>Channel between N1 and N2 has bandpass X, centred at f
>(ofcourse copper behaves like copper)
>
>do not wish to send a reverse "ack" for link detection
>etc.
>
>What are the simplest ways to do this,
>for example the case of copper would be to simply
>apply a DC voltage from the receiver side so that
>txmtr can look at presence/absence of DC line voltage
>to know link status.
>
>What do i do for other cases like fiber or wireless?
>
> --- Puddinhead Wilson 
><puddinghead_wilson007 at yahoo.co.uk> wrote: 
>  
>
>>Hi there!
>>
>>I have 
>>N1----->N2
>>
>>link from N1 to N2 is physical wire/unidirectional
>>wave guide.
>>
>>
>>No reverse connection possible
>>
>>1. if the media is copper, how does N1 detect that
>>link N1-N2 is down so it should not transmit? (i
>>think
>>i can solve this one)
>>2. if the media is fiber/wireless how will i solve
>>this? (i dont know how to this one :( )
>>
>>any takers?
>>
>>
>>
>>	
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>>
>>    
>>
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