ECN Forum Forums Technical Discussion Re: Computers and the Internet USB Cables

Mike (Trumpy);

Here's the typical USB Cable Connector Pinout information:

PIN # 1: + 5 VDC ( Vcc ),
PIN # 2: - DATA ( D- ),
PIN # 3: + DATA ( D+ ),
PIN # 4: GROUND ( GND )

4-PIN MALE at the Controller,
4-PIN FEMALE at the Peripheral

Upstream / Series "A" Connector is the thin, rectangular one.
Downstream / Series "B" Connector is the one with the 45° angles at the top.

Pinouts should be equal for IEEE 1392 "Firewire"

USB Devices communicate over the Bus via typical Packets, and of course, a group of Packets doing something useful is a Bus Transaction.
Interestingly, the USB network functions like IBM's Token Ring - only without the ring (ring in/ring out at MSAUs).
A device is given permission to communicate on the Bus when it receives a Token.

127 maximum nodes (devices).
Two different device speeds - 12 MBPS or 1.5 MBPS - both speeds may be used on the same network, so devices of either speed may be used together.

Found a gazillion other pinouts - like almost every connector / adapter (bus card or SIMM/DIMM) that can be found on Computers - be it an IBM type or Mac.
Would be great to compile this data ... also would be great to win $1,000,000.00 at the Poker Tables in Vegas; so let's see what happens first!


Let me know if you have additional Q's (Questions).

Scott35