Overview
5
5
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 amp 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 need
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.
3.2.1 About FireWire® 800
FireWire® 800 (IEEE 1394b) is twice as fast as FireWire 400 (IEEE 1394a) up
to 800 Mbit/sec, and also greatly increases the maximum transmission distance.
3.2.2 FireWire® Compliance
Your
VS-40FW
FireWire® 800/1394b Repeater / HUB
:
•
Fully supports the provisions of the IEEE P1394b Revision 1.33+ at
1-Gigabit signaling rates
•
Fully supports the provisions of the IEEE 1394-1995 Standard for High
Performance Serial Bus and the P1394a Supplement
•
Is fully interoperable with FireWire® and i.LINK™ implementation of
IEEE Std 1394
•
Provides three fully backward compatible (1394a-2000 fully compliant)
bilingual P1394b cable ports at up to 800 Megabits per second (Mbits/s)
•
Is fully compliant with OpenHCI requirements
•
Provides P1394a Fully Compliant Cable Ports at 100/200/400 Megabits
per Second (Mbits/s)
•
Includes full P1394a support, that is, Connection Debounce, Arbitrated
Short Reset, Multispeed Concatenation, Arbitration Acceleration, Fly-
By Concatenation, Port Disable/Suspend/Resume
•
Includes Extended Resume Signaling for Compatibility with Legacy DV
Devices
