Hello and thanks everybody for the help.
I hope but some of you have misunderstood my question.
(Really sorry if I am hearting any body)

The question in description states as:

We have outsourced & got a system developed from other company. They have given us the entire hardware with circuit diagrams and the complete software. Now we have to make the modifications in the board as per the new requirements of our clients. Now since they have taken lot of care while designing the hardware, and we have not been supplied with the cares they have takenwe are interested in some kind of a write-up which describes the significance and functional importance of the precautionary & protective circuits added.

Like I said the pull-ups will help me maintaining the data level stable for long wired devices.

Can somebody help me finding the documentation where the significance, functional importance & the advantages of the additional circuits like the pull-ups, bypass capacitors etc. are explained.


Thanks,
Sachin