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Proprietary connectors and formats
Microsoft's original Xbox game console uses standard USB 1.1 signaling in its controllers and memory cards, but features proprietary connectors and ports. Similarly, IBM UltraPort uses standard USB signaling, but via a proprietary connection format. American Power Conversion uses USB signaling and HID device class on its uninterruptible power supplies using 10P10C connectors. HTC manufactures Windows Mobile-based Communicators and the T-Mobile G1 which have a proprietary connector called HTC ExtUSB.
The ExtUSB combines mini-USB with audio input and output. Nokia includes a USB connection as part of the Pop-Port connector on their mobile phones. The second-generation iPod Shuffle uses a TRS connector to carry USB, audio, or power signals. Many digital cameras have a tiny 8 pin connector that combines USB with video and audio out. There are at least 10 different types of non-standard Mini-USB receptacles and jacks currently in use. Because of this, the USB-IF created the Micro series of receptacles and jacks, so as to standardize on one jack that delivers both power and data.