"So you don't want Mr. Shahzad to study the book???"

I want him to be aware of what the book is actually telling him - if it's general principles, he must not take it as a design guide; if it's specifics of some national system, he must make sure that it applies to his intended target system!

"Should he study the (dozens of) EWSD manuals from SIEMENS"

If he is designing for Siemens EWSD, then yes he will obviously need to study the EWSD specs!
If he was designing for the BT network in the UK, he'd have to study this lot:
http://www1.btwebworld.com/sinet/

"which I am sure would pass too high over his head."

This is why it has already been suggested that buying a ready-made 3rd-party interface is likely to be the best option!