Dock Connector

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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 (-)