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  3. 1421619903

USB cable - dual head

Hello,
I am not quite sure about dual-head USB cable pinout.
This is what I understood so far:

Both power and data cables (with separate USB type A connectors at PC end) connect to one type B connector at DAC end. Later the power type A connector gets unplugged, after initial "handshake".

1. DATA cable - has 3 wires, Signal +, Signal -,
and power - (ground).

2. POWER cable - has 2 lines, power + (5 VDC)
and power - (ground).

Is this right? Or data cable carries ONLY Signal + and Signal -?

After the USB A connector with power is unplugged, I guess you must have ground also in data cable? Or not?

Any help would be very appreciated. Thanks :)
audiobb
2 responses Add your response
deadlyvj
66 posts
 
Hi,
The power cable can be disconned in DACs with their own power supply. It is however need in some for the initial handshake.

The data lead also has the ground.

Please make sure the cable has a bandwidth, I just bought a cable, and did not realize it was limited to 196/24. Preferably these cables must meet the USB standard, capable for 480 Mb/s.
audiobb OP
103 posts
 
Hi, thanks for your answer.It seems that Audiogon members don't really know the answer to this.
I would like to build my own cable, that is why I ask.

How can the cable be limited to certain numbers in bits and kHz?
Except for certain data rate, like 480 MB/s.

I thought DAC can be limited, software also, and USB/SPDIF converters. But cable just carries the signal, I guess.

So, is this right?

""""
1. DATA cable - has 3 wires, Signal +, Signal -,
and power - (ground).

2. POWER cable - has 2 lines, power + (5 VDC)
and power - (ground).
"""
Thanks :)
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