Kramer VS-4FW Руководства по эксплуатации онлайн [6/14] 140173

KRAMER: SIMPLE CREATIVE TECHNOLOGY

Overview

In some ways, you could consider the hub as similar to an audio/video

distributor. However, contrary to audio/video one-way signals, a FireWire

hub is like a network, with bi-directional signals. The standard defines

FireWire as Peer-to-Peer connection; that is why two devices, or a device and

a computer can talk to each other.

It is important to note that everything depends on your computer’s software,

and the firmware of the devices. Sometimes, it is possible that a computer can

work with many FireWire devices simultaneously (like a distribution),

sometimes it can work with many devices in time-sharing mode (like a

switcher). But most often it is possible to work one-to-one. In this case, you

have to disconnect all the devices that are unnecessary at this time and leave

only two of them. Since the FireWire is hot-plug standard, you can

connect/disconnect devices at any time.

Hubs can be powered or unpowered. The FireWire standard lets devices draw

their power from their FireWire connection. Obviously, a high-power device,

like a professional DV camcorder, will have its own power supply, but

low-power devices like a Webcam derive their power from the bus in order to

simplify them. The power for this (up to 1.5 amps at 12 volts) comes from the

computer.

If you have several self-powered devices, then your hub does not need to be

powered, as none of the devices connecting to the hub needs additional

power, and the hub itself can derive power from the computer. If you have

many unpowered devices, you probably need a powered hub. The hub has to

be powered from an AC adapter, which supplies power to the bus.

3.2 FireWire Compliance

In particular, the VS-4FW, VS-6FW and VS-8FW:

 Fully support the provisions of the IEEE 1394-1995 Standard for

High Performance Serial Bus and the P1394a Supplement

 Are fully interoperable with FireWire™ and i.LINK™

implementation of IEEE Std 1394

 Are fully compliant with OpenHCI requirements

 Provide P1394a Fully Compliant Cable Ports at 100/200/400

Megabits per Second (Mbits/s)

 Include full P1394a support, that is, Connection Debounce,

Arbitrated Short Reset, Multispeed Concatenation, Arbitration

Acceleration, Fly-By Concatenation, Port Disable/Suspend/Resume

 Include Extended Resume Signaling for Compatibility with Legacy

DV Devices