Honorific phrase used to acknowledge shared knowledge with the listener. Often used as a preface before stating something the listener is expected to know.
As you know, the new system will start next month.
ご存知の通り、彼はこの分野の専門家です。
As you are aware, he is an expert in this field.
知っての通り is a plain, casual way to say 'as you know', while ご存じの通り is the honorific version used to politely address someone of higher status.
Standard kanji spelling for this honorific phrase.
Kana spelling of 通り is also common.
Combination of the honorific prefix ご, the noun 存知 (ぞんじ, 'knowing'), the possessive particle の, and the noun 通り (とおり, 'as, in accordance with').