Apple iPod 3rd Generation pinouts
The connector/pinout information may be applied to the Apple model iPod 3rd Generation

 iPod Nano (4th, 5th Gen), iPhone (1st, 2nd, 3rd, 4th Gen), iPod Shuffle (3rd Gen), Cell Phone Connection pinout iPhone headphone (handsfree)
iPod Nano (4th, 5th Gen), iPhone (1st, 2nd, 3rd, 4th Gen), iPod Shuffle (3rd Gen), Cell Phone Connection pinout iPhone headphone (handsfree) Apple iPod, iPhone (2g, 3g), iPad Dock connector pinout Used in 3rd and later generation iPods for  charging, connecting to a PC via USB or Firewire,  to a stereo via line-out, to a serial device (controlled via the Apple Accessory Protocol). This connector exists in most Apple iPod MP3 players (iPod 3G, 4G, 5G Video, 5.5G Video, Nano (1G, 2G, 3G, 4G), Mini, Classic, Touch, Touch 2G, and iPhone (1G, 3G, 3GS, 4 and 4S))
Apple iPod, iPhone (2g, 3g), iPad Dock connector pinout Used in 3rd and later generation iPods for  charging, connecting to a PC via USB or Firewire,  to a stereo via line-out, to a serial device (controlled via the Apple Accessory Protocol). This connector exists in most Apple iPod MP3 players (iPod 3G, 4G, 5G Video, 5.5G Video, Nano (1G, 2G, 3G, 4G), Mini, Classic, Touch, Touch 2G, and iPhone (1G, 3G, 3GS, 4 and 4S)) Apple iPod, iTouch, iPad remote and headphone  pinout The 3rd generation iPod introduced a new headphone and remote connector, which carries audio data and remote control data to the iPod. The remote control data is sent via a serial Apple Accessory Protocol.
Note, on the iphone, itouch, ipad devices, the base ring is used for microphone input.
Apple iPod, iTouch, iPad remote and headphone  pinout The 3rd generation iPod introduced a new headphone and remote connector, which carries audio data and remote control data to the iPod. The remote control data is sent via a serial Apple Accessory Protocol.
Note, on the iphone, itouch, ipad devices, the base ring is used for microphone input. Universal Apple-compatible CTIA Headset/Earphone 3.5mm Jack (LRGM) pinout for Samsung, HTC Hero, Blackberry and other cell phones with 3.5mm, 4 connection (4 "pin"), headset jack.
Universal Apple-compatible CTIA Headset/Earphone 3.5mm Jack (LRGM) pinout for Samsung, HTC Hero, Blackberry and other cell phones with 3.5mm, 4 connection (4 "pin"), headset jack.