Although a Dock Connector can refer to many things, Apple has established the small, rectangular, 30 terminal connector used to connect a full sized iPod to a personal computer or power adapter as "the Dock Connector" This device is often called a 30-Pin Connector.
The pins of the connector on most iPods are as follows:
| Pin |
Signal |
Description |
| 1 |
GND |
Ground (-) |
| 2 |
GND |
Audio & Video ground (-) |
| 3 |
Right |
Line Out — R (+) |
| 4 |
Left |
Line Out — L (+) |
| 5 |
Right In |
Line In — R (+) |
| 6 |
Left In |
Line In — L (+) |
| 7 |
|
|
| 8 |
Video Out |
|
| 9 |
C |
S-Video Chrominance |
| 10 |
Y |
S-Video Luminance |
| 11 |
GND |
Serial GND |
| 12 |
Tx |
iPod sending line, Serial TxD |
| 13 |
Rx |
iPod receiving line, Serial RxD |
| 14 |
|
|
| 15 |
GND |
Ground (-) |
| 16 |
GND |
USB GND (-) |
| 17 |
|
|
| 18 |
3.3V |
3.3V Power (+) |
| 19, 20 |
+12V |
FireWire Power 12 VDC (+) |
| 21 |
Serial enable |
Connects to ground via a 1 MΩ, 1 % resistor in Belkin Amp/Charger. When this pin is grounded it appears to close a switch making the iPod shut off in case of a power loss. Dock has the same resistor. Some sources suggest connecting this pin to pin 11 through a 500 kΩ resistor to enable serial communications. |
| 22 |
TPA (-) |
FireWire Data TPA (-) |
| 23 |
5 VDC (+) |
USB Power 5 VDC (+) |
| 24 |
TPA (+) |
FireWire Data TPA (+) |
| 25 |
Data (-) |
USB Data (-) |
| 26 |
TPB (-) |
FireWire Data TPB (-) |
| 27 |
Data (+) |
USB Data (+) |
| 28 |
TPB (+) |
FireWire Data TPB (+) |
| 29, 30 |
GND |
FireWire Ground (-) |
The S-Video output has been replaced by a component (YUV) output at the iPod Touch and iPhone models, outputting 480i signals.
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