Why does (disco.)iphone not sync bookmarks, mp3s, etc.. BUT it syncs mails?

simple question i cant find in the user guide from apple;
i must place my iphone in my dock which is connected via usb to my imac
then i can sync it with mp3s and movies and so on...
why does it receive mails (disconnected from dock) when i am online with it (via airport in my flat) BUT not
mp3s and other sync stuff like bookmarks and ical?
thanks
Message was edited by: purepeter

If you are not on your home LAN you are limited by the bandwidth of the site you are using. While the WiFi speed is 54 mbps, that is shared among all users on that access point, so you don't get all of it. In addition, you are limited by the speed of the link connecting you to the Internet backbone. For most commercial WiFi sites this is rather slow; a T1, for example, is 1.55 Mbps, and it is also shared. So doing the same calculation, and assuming you are the only one using that connection, it would take about 13 hours to sync 7 MB. In addition, to do that, your computer with your bookmarks, music, etc. would have to be configured as a server accessible from the Internet, so any of the world's millions of hackers would potentially have access to your computer.
The reason email can sync is that it is stored on your ISP's server, and the iPhone can retrieve it from there. Your bookmarks, notes, music and videos are NOT on your ISP's server, so you would have to make your own computer a server, get (and pay for) a fixed IP address (typically ~$100/month), and know enough about what you are doing to configure it.
If you are on your home LAN your WiFi speed is 54 Mbps (for 801.11G routers), but you require 2 way transfers; one from your computer to the LAN and one from the LAN to your iPhone. Ethernet protocol also adds overheard, so the effective speed of a wireless LAN is around 25% of the theoretical maximum bandwidth. Thus, your actual throughput is 25% of 54 Mbps, or 13.5 Mbps, and that is split in two by the need for your computer to upload while the iPhone is downloading, giving a total throughput of about 6 Mbps. Doing the same calculation again you get 20 minutes. But you are next to your computer anyway, so why not just plug it in and do it in 3 minutes?
Message was edited by: Lawrence Finch

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