[G4] Target Disk Mode ?

[Doug McNutt]

At 12:30 -0700 9/19/06, Jamie Pruden wrote:
>Both machines randomly choose a self-assigned IP address, so there's  no problem with them connecting. There is a *very* slight chance they  will choose the same address, but if they do, one of the machines  will recognize that the IP address is in use and will change its  address to give it a unique address.
>
>On Sep 19, 2006, at 10:53 AM, Doug McNutt wrote:
>
>>At 10:42 -0700 9/19/06, Harry Freeman wrote:
>>>This is because most modern platforms have an ethernet port that  detects if the other end is DTE or DTC and makes an adjustment to  be what is necessary.
>>
>>Does anyone know how a logical collision is prevented when two  machines connected as such are turned on at the same time?

That was not my problem but I can understand why I was misunderstood. I am not talking about IP addresses. That comes after the ethernet connection is established.

Machine 1 looks for a voltage of some sort on one of the two pairs that constitute the UTP ethernet connection. When it sees a voltage on, say, pair 1 it determines that it should be transmitting on pair 2 and applies its transmitted signals there while receiving on pair 1. All is now working

But if it sees no voltage on either pair it assumes that the other end isn't connected and applies voltage to one of the pairs assuming that the other end will figure it out when connection is made.

But the other end might not be a universal or it might have been powered up at precisely the same time at the current end. There is now an argument and I can't find a document that says how it should be settled.

And, by the way, there are typically transformers in the lines for ground isolation so the USB tricks that identify plugged-in devices are not available.

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