words, what you really need is to reach the Internet backbone with a few "hops" that may be less. Good point-to-point network arrangement can pray for the role, at the same time, a good business-level network can also play a very important role. Here I do a high-speed comparison of my home network and work network:
The number of "hops" from Uverse network to google.com: 13
Twtelecom the number of "hops" from the commercial-level network
.
The data transfer rate of Bluetooth 3.0 is increased to approximately 24Mbps (you can call 802.11 wi-Fi for high-speed data transfer when needed).
On the transfer speed, Bluetooth 3.0 is eight times times the Bluetooth 2.0, it can be easily used for video recorder to HDTV, PC to PMP, UMPC to the data transfer between the printer, but need both sides to achieve this standard to realize the function.
Advantages
Compared to the V2
StandardAugust 2, 2007, the Bluetooth Technology Alliance formally approved the Bluetooth 2.1 version of the specification, "Bluetooth 2.1+edr", can be used for future devices free of use. and 2.0 version of the same generation of products, still occupy a large share of the Bluetooth market, the relative 2.0 version is mainly to improve the standby time of more than twice times, technical standards have not fundamentally changed.Bluetooth 3.0 StandardApril 21, 2009, Bluetooth Technology Allianc
speed. And Zhang boss is using fiber access, upload download speed is equivalent. So Lee boss Broadband upload speed than download slow is normal phenomenon.Question two: Why is the upload speed of ADSL only 1/8 download speed?ADSL (Asymmetric digital subscriber line, asymmetric subscriber loop) is a type of network access. It is called an asymmetric digital subscriber line loop because of an asymmetric uplink and downlink bandwidth. In the early days, telephone lines were used as ADSL line med
large power consumption of the equipment continues to exist in the X standard.
Bluetooth 2.1 Standard
August 2, 2007, the Bluetooth Technology Alliance officially approved the Bluetooth 2.1 version of the specification, that is, "Bluetooth 2.1+edr" for future equipment free to use. and 2.0 version of the product at the same time, still occupy a larger share of Bluetooth market, relatively 2.0 version is mainly to improve the standby time of more than twice times, the technical sta
1 , faster transfer speedsThe new version of Bluetooth transmission speed limit is 24Mbps, is twice times the previous 4.2LE version.2 , the farther effective distanceTheoretically, the effective working distance between Bluetooth transmitting and receiving devices can be up to 300 meters. Of course, the actual effective distance also depends on the electronic device you use.3 , navigation functionscan be used as indoor navigation beacon or similar po
extension). Emma, finally relieved, we can reach 24Mbps.
However, due to the difference between the physical layer and AMP technology of Bluetooth itself is too obvious, this extension can only be used interchangeably (Alternate), that is, I (BR/EDR) Without You (AMP). Well! Not elegant!
Buried a problem: can only be used interchangeably, then how do they switch? The snail will discuss the problem in the following content, according to the so
speed of the Internet and the quality of the call will not occur. Usually ADSL can provide up to 3.5Mbps uplink speed and up to 24Mbps downlink speed without affecting normal telephone communication.
The concept of bandwidth, it refers to the data transmission rate, such as memory bandwidth, bus bandwidth, network bandwidth, etc., are in "bytes/sec" as the unit. We don't know since when. The concept of the data transmission rate is called network "b
transmission advantage is greater. Even the latest Bluetooth 4.0 version, the physical layer transmission speed is 24Mbps, and no need to network mode in the fast-propagation of eggplant is 802.11 transmission technology, now mobile phones are usually 802.11N, physical layer transmission speed in 100-300mbps, the speed advantage is very obvious. And compared to Bluetooth, Eggplant express support for richer transmission content, a simpler procedure.
83.5M bandwidth
2) divided into 14 sub channels
3 width of each sub channel is 22MHz4 Central frequency interval 5MHz of adjacent channel5 adjacent channels have overlapping frequency (such as 1 channel and 2, 3, 4, 5 channel frequency overlap)6 The entire frequency band only 3 (1, 6, 11) Mutual interference channel
3. Receiving sensitivity
BER Requirements
Rate
Minimum signal strength
Per (BER) no more than 8%
6Mbps
-82dbm
9Mbps
-81dbm
of up to 8Mbps, uplink rate of 640kbps, and adsl2+ downlink rate of the highest for 24Mbps, the uplink rate of 1Mbps. From the transmission rate, ADSL is difficult to meet the high bandwidth users access requirements, adsl2+ in the near future can basically meet the bandwidth needs, but the uplink bandwidth is low.
Following the first generation of VDSL, the ITU passed the VD-SL2 in May 2005 (second generation VDSL) The standard G.993.2,VDSL2 has go
frequency range of 2.400-2.4835ghz and a total of 83.5M bandwidth2) divided into 14 sub-channels3) 22MHz per sub-channel width4) Center frequency interval of adjacent channel 5MHz5) Multiple adjacent channels exist frequency overlap (such as 1 channels with 2, 3, 4, 5 channels have frequency overlap)6) only 3 (1, 6, 11) channels are not interfering with each other in the entire frequency band3. Reception Sensitivity
BER Requirements
Rate
Minimum signal strength
sub-band. Among them, the band of 4khz for the transmission of POTS (traditional telephone service), the 20KhZ to 138KhZ frequency bands used to transmit uplink signals, 138KhZ to 1.1MHZ band used to transmit the downlink signalWe see that the frequency span of the downlink determines the large and upstream frequency spans! This is also due to the fact that we use the downlink more than the upstream for our daily use.and ADSL theoretically up to 3.5Mbps upstream speed and up to
In order to get rid of the PPS influence speed and BT caused slow network speed problem, sharing the Internet should be limited to speed.
When it comes to speed limits, you may think of a peer-to-peer terminator. A peer-to-peer Terminator is a software that restricts the speed of a LAN computer, and is used by many people.
Speed limit, through the unlimited router settings can also be easily done, here to introduce a speed-limiting function of the wireless router.
Wireless router with speed-l
To the photographic enthusiasts to share a detailed analysis of the Canon SX60 HS support video resolution.
Share list:
Canon SX60 HS supports 1080p (1920x1080 30p,24mbps,16mbps) video.
For more questions about Canon SX60 HS support for 1080P video, the following will do a detailed answer. Canon SX60 HS's zoom-assisted composition function can greatly enhance the success rate of framing under high magnification. Among them, "composit
more students to participate in learning, so that more teachers and leaders to observe the real-time without prejudice to normal teaching. In this way, not only can the teachers save the teaching cost of demonstrating and demonstrating, but also let teachers have more time to improve the teaching quality. "Star Online" system to support the highest rate of 24Mbps multicast, this service is suitable for Mepg-ⅱ high-quality, multi-channel streaming aud
interference poses a great challenge and needs due attention.
Wireless jamming error saying #2: "My network seems to be working, so jamming is not a problem." ”
The 802.11 protocol is designed to a certain extent to resist interference. 802.11 the device finds interference before the data is transmitted, it pauses the transmission until the disturbance disappears. If the interference occurs during transmission (and the interference causes the packet to not receive properly), then confirm that
But those who play computer for some time friends, I am afraid have experienced the integrated sound card (mainly refers to the onboard AC ' 97 sound card) from the resistance, are regarded as the letter will be mentioned, and then to half-hearted finally accepted the process of calm? Despite several developments, AC ' 97 is still synonymous with low quality for those who choose other users. As Intel began using the Hdaudio standard on its i915/925 series chipsets at the end of 2004, the days of
Transfer rate:
800Mbps
Bluetooth
Version level:
4.0
Maximum Transfer rate:
24Mbps
LAN
BASE-T Ethernet
Peripheral Interface
The XHCI host controller integrates the following phy:2xusb3.0,3xusb2.0;usb3.0 device controller integration PHY;EHCI controller with USB2.0 embedded Hub;4-lane pcie:1 a x1 and a x4 controller; SATA (1 ports) ; 2xsd/mmc Controller (sup
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