Frame grabbers IEEE 1394 interface is commonly found in, devices that capture and digitize an analog video signal however, IEEE 1394 is facing competition from the interface (citing speed and availability issues). The later move away from tape towards solid state memory or disc media (e.g., SD Cards, optical disks or hard drives) has facilitated moving to USB transfer because file based data can be moved in segments as required. USB relies heavily on processor support and this was not guaranteed to service the USB port in time. USB is unsuitable for transfer of the video data from tape because tape by its very nature does not support variable data rates. The protocol also accommodates remote control (play, rewind, etc.) of connected devices, and can stream time code from a camera. Many have a 'DV-input' FireWire connector (usually an alpha connector) that can be used to record video directly from a DV camcorder ('computer-free'). Labelling of the port varied by manufacturer, with Sony using either its i.LINK trademark or the letters 'DV'.
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