Rocstor Arcticroc 2T User Manual download pdf (Page 53)

ARCTICROC 2T – 2Bay RAID System - User Manual Page | 53

KNOWLEDGE BASE

Introductions: Interfaces (ports) and Cables

FireWire is Apple Inc.’s brand name for the IEEE 1394

interface (although the 1394 standard also defines a

backplane interface). FireWire is also known as i.LINK

(Sony’s name) and DV (Panasonic’s name, not to be

confused with DV camcorder tapes). It is a serial bus

interface standard for high-speed communications and

isochronous real-time data transfer, frequently used in a

personal computer and digital audio / digital video

devices.

Standards and versions

FireWire 400 (IEEE 1394) 6-Pin connector can transfer data between

devices at 100, 200, or 400 Mbits/s half-duplex data rates (the actual

transfer rates are 98.304, 196.608, and 393.216 Mbits/s, i.e. 12.288,

24.576 and 49.152 megabytes per second respectively). These different

transfer modes are commonly referred to as S100, S200, and S400.

Cable length is limited to 14.8 ft (4.5 meters), although up to 16 cables can be daisy-chained

using active repeaters, external hubs, or internal hubs often present in FireWire equipment.

The S400 standard limits any configuration's maximum cable length to 230Ft (72 meters.) The

6-pin connector is commonly found on desktop computers and can supply the connected

device with power.

The 6-pin powered connector adds power output to support external devices. Typically a device

can pull about 7 to 8 watts from the port. However, the voltage varies significantly from

different devices. Voltage is specified as unregulated and should nominally be about 25 volts

(range 24 to 30). Apple's implementation on laptops is typically related to

battery power and can be as low as 9 V but more likely about 12 V.

FireWire 400 (IEEE 1394a)

1394a also standardized the 4 pin connector already widely in use. The 4-

pin version is used on many consumer devices such as camcorders, some

laptops and other small FireWire devices. Though fully data compatible

with 6-pin interfaces, it lacks power connectors.

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Rocstor Arcticroc 2T User Manual Page 53