IPOD classic 160GB/120GB USB cable pin allocation

I bought a 160GB ipod (exhibt so it was already used for some months)
I was able to use it for 2 days but it never charged during this time, until it remained forever in "charging, please wait"
I got a new 160GB for warranty, but they forgot to give me my usb cable back, so I lent one from my neighbour (120 GB Ipod).
The 160 GB ipod is charging fine with the 120 GB cable.
Now I'm looking at the pins of the two cables, one has 5 pins and the other has 6 pins and only 4 pin allocations are the same.
Also one cable has "Designed by Apple in California Assembled in China" the other has nothing on it
Now I'm hesitant to try the old cable I got back from the store today.
Is it an original one, will it cause some bad things to happen to my ipod?
Does anybody know the pin allocations of the ipod or cable?

Ah it's called "dock connector"
wiki has a page : http://en.wikipedia.org/wiki/Dock_connector
One cable has
16 GND USB GND
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.
23 5 VDC USB Power 5 VDC
25 Data USB Data
27 Data USB Data
The other has:
1 GND Ground
15 GND Ground
16 GND USB GND
23 5 VDC USB Power 5 VDC
25 Data USB Data
27 Data USB Data
I wish I knew what it meant, maybe it's nothing....

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