Thanks everybody for the inputs.

Let me paraphrase my query. Let us assume a hypothetical (or real world) situation, where a device develops a fault (by a reason beyond your control) and hogging the network / bus. This makes the bus unusable until the faulting device is isolated from the bus. What are the precautions one should to take (consider) to handle the above. How do the professional designs handle this?

Steve,

>>Perhaps effectively ac coupling the direction signal to the driver would do it.

Could you please, elaborate on this. Do you mean to AC couple the data to the bus?
If yes, what is the mechanism involved?

Jacob Boyce,

That is a good suggestion with a bit of overhead. But it is a premium you have pay to get a reliable system.

Erik,

I was waiting for you input. Thanks.
>> The real issue is to use modern transceivers,
I do agree modern components will reduce the chances of failure, but can not guarantee nil failure. In a practical application, the network would have spanned over a wide area and it would be difficult and time consuming to rectify. The problem is more serious if it is used for real time control. Can I request for your input?


Regards,

Leo Paul