From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: From: Ricky Soh Reply-To: Ricky Soh To: bluez-users@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Subject: [Bluez-users] Bluetooth headset enquiries Sender: bluez-users-admin@lists.sourceforge.net Errors-To: bluez-users-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Date: Thu, 30 Sep 2004 14:38:02 +0800 Dear all, I would like to clear some doubts about the Bluetooth headset profile. Please assist in anyway possible. 1. After both the headset and AG (Audio Gateway) are paired, if there are no need for active communication, the headset will go into PARK mode but stay in sync with the AG. At this point, is there any transmission between the devices, or is the headset just purely listening to the master (AG) for the clock sequence? What is the rate/frequency that the master sent a signal to the headset to indicate its clock and frequency sequence at this time? 2. What is the encryption key for SCO packets? Is it the same Kc derived from the E0 cipher scheme used in encrypting the data files in data transmission? I heard that different security modes will result in different Kc length, do you have any details on this and what is the length of the key? 3. For FHSS in bluetooth, there are 13 different packet types. Which part of the packet is frequency hopping sequence information attached to? Is it the access codes, the header or the payload? What is the bit of this information? Do the slave derive that sequence based on the data (Master's BD_ADDR and clock) exchanged or the slave gets the sequence directly from the Master? Sorry for the lengthy email. Please help if possible. Thanks Sincerely Ricky ------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl _______________________________________________ Bluez-users mailing list Bluez-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-users