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Speed
Currently, there are 3 speed modes defined by the latest USB 3.0/USB 3.1 Gen 1 specification. They are Super-Speed, Hi-Speed and Full-
Speed. The new SuperSpeed mode has a transfer rate of 4.8Gbps. While the specification retains Hi-Speed, and Full-Speed USB mode,
commonly known as USB 2.0 and 1.1 respectively, the slower modes still operate at 480Mbps and 12Mbps respectively and are kept to
maintain backward compatibility.
USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below:
•
An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below).
•
USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more for two pairs
of differential signals (receive and transmit) for a combined total of eight connections in the connectors and cabling.
•
USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a 10-fold
increase in theoretical bandwidth.
With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices, high megapixel
count digital cameras etc., USB 2.0 may not be fast enough. Furthermore, no USB 2.0 connection could ever come close to the 480Mbps
theoretical maximum throughput, making data transfer at around 320Mbps (40MB/s) — the actual real-world maximum. Similarly, USB
3.0/USB 3.1 Gen 1 connections will never achieve 4.8Gbps. We will likely see a real-world maximum rate of 400MB/s with overheads. At this
speed, USB 3.0/USB 3.1 Gen 1 is a 10x improvement over USB 2.0.
Applications
USB 3.0/USB 3.1 Gen 1 opens up the laneways and provides more headroom for devices to deliver a better overall experience. Where USB
video was barely tolerable previously (both from a maximum resolution, latency, and video compression perspective), it's easy to imagine
that with 5-10 times the bandwidth available, USB video solutions should work that much better. Single-link DVI requires almost 2Gbps
throughput. Where 480Mbps was limiting, 5Gbps is more than promising. With its promised 4.8Gbps speed, the standard will find its way
into some products that previously weren't USB territory, like external RAID storage systems.
Listed below are some of the available SuperSpeed USB 3.0/USB 3.1 Gen 1 products:
•
External Desktop USB 3.0/USB 3.1 Gen 1 Hard Drives
•
Portable USB 3.0/USB 3.1 Gen 1 Hard Drives
•
USB 3.0/USB 3.1 Gen 1 Drive Docks & Adapters
•
USB 3.0/USB 3.1 Gen 1 Flash Drives & Readers
•
USB 3.0/USB 3.1 Gen 1 Solid-state Drives
Technology and components
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Содержание Latitude 3540
Страница 1: ...Dell Precision 3540 Service Manual Regulatory Model P80F Regulatory Type P80F001 ...
Страница 19: ...2 Pry the base cover from the edge using a plastic scribe 1 2 Disassembly and reassembly 19 ...
Страница 22: ...2 Press down on the edges pf the base cover till clicks in place 22 Disassembly and reassembly ...
Страница 23: ...3 Tighten the eight captive screws to secure the base cover to the computer Disassembly and reassembly 23 ...
Страница 27: ...2 Reconnect the battery cable to the connector on the system board Disassembly and reassembly 27 ...
Страница 42: ...4 Lift the speaker up out of the computer 42 Disassembly and reassembly ...
Страница 44: ...2 Re route the speaker cables through the routing clips on the computer chassis 44 Disassembly and reassembly ...
Страница 49: ...3 Re connect the Heatsink fan cable to the connector on the system board Disassembly and reassembly 49 ...
Страница 53: ...3 Connect the system fan cable to the connector on the system board Disassembly and reassembly 53 ...
Страница 60: ...4 Remove the single M2x2 5 screw and lift the LED board out of the computer 1 2 60 Disassembly and reassembly ...
Страница 80: ...4 Carefully close the LCD screen 80 Disassembly and reassembly ...
Страница 85: ...3 Reconnect the backlit cable and the keyboard cable to the touchpad Disassembly and reassembly 85 ...
Страница 95: ...2 Gently snap the display bezel into place Disassembly and reassembly 95 ...
Страница 102: ...102 Disassembly and reassembly ...
Страница 104: ...4 Replace the four M2x2 screws that secure the display panel to the display assembly 104 Disassembly and reassembly ...
Страница 115: ...6 Turn on the modem 7 Turn on your computer Troubleshooting 115 ...