If you are the beneficiary of an approved H-1B petition with a start date of October 1, 2014 you may now file your visa application at a U.S. consulate or embassy.
U.S. consulates and embassies are authorized to accept H-1B visa petitions and issue visas to qualified applicants up to 90 days in advance of your beginning employment status (10/1/2014).
The U.S. consulates and embassies are required to inform you verbally and in writing that you can only use the H-1B visa to apply for admission to the United States starting ten days prior (9/21/2014) to the beginning of the approved status period.