20mbps

parallel bus, it is recommended to use the W5200 of the indirect bus interface, it is generally not recommended to choose W5100.If the customer to the communication rate is more than 3Mbps less than 20Mbps, can choose W5100, only through the parallel bus mode, the hardware design is slightly more complex. Although the SPI clock rate of the W5200 can reach 80MHz, but limited to the MCU's hardware SPI clock limit, the general speed is difficult to rais

In fact, many people hope that the 2007 3G licences will be able to distribute digital trunking licences to some of the emerging operators, such as railcom, so that even if the 2008 Olympic Games cannot replace the digital trunking system in time, So can also make the domestic digital trunking communication standards can have more powerful support and European and American standards a high and low. VDSL2 Technical Features In recent years, with the rapid development of broadband Internet tech

answer with a Lezilai: Host a network of the interface router pulls two broadband, as follows: interface broadband type downlink bandwidth uplink bandwidth WAN1 ADSL 4M 512K wan2 fiber

is: The CIF video format for the local monitoring of the required network upstream bandwidth of at least 5Mbps;D1 video Format The bitrate of each camera is 1.5Mbps, that is, the data transmission bandwidth required for each camera is the data transfer bandwidth required for 1.5mbps,10 cameras:1.5Mbps (bit rate in video format) x10 (the multiplex of the camera) =15mbps (upstream bandwidth)That is: the use of D1 video format to monitor the network upstream bandwidth required for at least 15Mbps;

, performance, and security events. Get support from Cisco Security Policy Manager (CSPM) Scalable, unified management of all Cisco PIX Firewall products in the enterprise with CSPM's powerful policy management infrastructure Cisco PIX CLI Allows users to use existing PIX CLI technologies for easy installation and management without the need for further trainingcan be accessed in a variety of ways, including console ports, remote landings, and CLI SNMP an

of usage trends, performance, and security events. Get support from Cisco Security Policy Manager (CSPM) Scalable, unified management of all Cisco PIX Firewall products in the enterprise with CSPM's powerful policy management infrastructure Cisco PIX CLI Allows users to use existing PIX CLI technologies for easy installation and management without the need for further trainingcan be accessed in a variety of ways, including console ports, remote landings, and CLI

, and every time the channel is free from idle to busy or idle, the PLCP (physicallayerconvergenceprocedure) of the physical layer produces a primitive: Phy-cca. Indicate (state), State is the status variable, and when PLCP detects a busy channel, its value is busy, and vice versa, idle. The attack method is simple but highly efficient, and does not require special equipment and technology. In addition, the attack device used does not need high transmit power, it is difficult to find and locate

speed is slow, it is basically difficult to achieve the relevant nominal wireless router transmission speed. For example, one label called 54Mbps (actually wireless router transmission rate of 20Mbps or so) WLAN network, but its display transmission speed only 11Mbps (actual transmission rate of around 4Mbps), 5.5Mbps (actual transmission rate in the 2Mbps or so) or lower, What should we do to deal with this situation? First, we'll start with a sim

compensation code is used to control CCK modulation technique. When the distance between workstations is too long or interference is too large, the signal to noise ratio is lower than a certain threshold value, the transfer rate can be reduced from 11mb/s to 5.5mb/s, or to 2mb/s and 1mb/s rate of direct sequence spread spectrum technology. However, the 802.11B standard has a maximum rate of 20Mbps, which remains backward compatible with 802.11. All

Wireless LAN, also known as WLAN (Wireless LAN), has become a more and more users of the networking approach. Wireless network installation is very convenient, do not need to rewiring. So it will not destroy the original home decoration, compared to the cable network, wireless network is much more flexible. In the use of the process, we found that although the WLAN does not have the trouble of wiring, and easy to use, but sometimes we will find its signal is not very stable, data transmission s

Wireless LAN, also known as WLAN (Wireless LAN), has become a more and more users of the networking approach. Wireless network installation is very convenient, do not need to rewiring. So it will not destroy the original home decoration, compared to the cable network, wireless network is much more flexible. In the use of the process, we found that although the WLAN does not have the trouble of wiring, and easy to use, but sometimes we will find its signal is not very stable, data transmission s

it as:Buffer size = Bandwidth * RTT?? Why is it twice times? Because it is possible to think, if the sliding window is Bandwidth*delay, when the last byte of data is sent at the end of the first time to send back an ACK to continue sending, you need to wait for a one-way delay time, so when it is twice times, just can wait for the ACK time to continue to send data, The data is sent exactly when the ACK is received, which improves efficiency.For example: Bandwidth is

smallest unit transmitted in a computer is the signal unit bit, the basic unit of the digital traffic is bit, and the basic unit of time is s (seconds), so bit/s (bits per second) is the basic unit that describes the broadband.The bandwidth (bps) is the maximum bit data that can be passed within a fixed time (1 seconds).BPS (bit per second)Cases:Some broadband carriers, a 20Mbps bandwidth, while the actual maximum download speed is about 2.5mb/s (whi

table, and the switch logs the new address to the Address table when the receive Port responds. At the same time, each port of the switch has bandwidth alone and will be set up with a 10Mbps Ethernet switch, then the total traffic for the switch equals 2*10=20mbps. If the 10Mbps hub, the total flow will not exceed 10Mbps. Routers work in the third layer of the OSI model, the "Network layer". Routers provide a path between different networks and stor

=20mbps, and the total flow of a hub will not exceed 10Mbps when using the 10Mbps shared hub.In a word, the switch is a kind of network device which can complete the packet forwarding function based on MAC address Recognition. The switch can "learn" the MAC address and store it in the internal address table, by establishing a temporary switching path between the originator of the data frame and the target receiver, so that the data frame is directly f

-time performance.The operating baud rate of the chip mother serial port and the sub-serial port can be adjusted by software without modifying the external circuit and crystal frequency. The chip has less external control, flexible application, simple programming and is suitable for most systems with serial port expansion requirements.2 characteristics--write control word to control the chip--each sub-serial port baud rate adjustable (unified adjustment)--data format 10-bit or 11-bit optional--s

up to 144Mbps on the 2.4GHz, and if your bond the 5GHz you can get up to 300MLater found online:In the three encryption tests for WEP, WPA, and WPA2, the main reason for the significant change in the transmission rate of wireless networks is that the IEEE 802.11n standard does not support high throughput rates for unicast ciphers with WEP encryption (or TKIP encryption algorithms). In short, the 11n product does not support the WEP encryption method or WPA-PSK/WPA2-PSK encryption method TKIP al

SummaryIntroduction to the first chapterBody1, Generally speaking, the video signal information is large, the transmission network needs a relatively wide bandwidth. For example, a video videophone or conference TV signal, due to its active content is less, the required bandwidth is narrower, but to achieve good quality, not compressed about a certain number of Mbps, compression needs 384Kbps, and, for example, a high-definition HDTV signal (HDTV), because of its large amount of information, not

is usedManchester encoding, although the effective bandwidth of the line is only 10Mbps, but the actual bandwidth is 20Mbps. The combination of 4B/5B encoding and MLT-3 encoding for Gigabit Ethernet, the transmission code stream is 4b/5b encoded, then MLT-3 encoded, and finally on the line transfer; Gigabit Ethernet is 8b/10b encoded with NRZ encoding combination method, Gigabit Ethernet is used for 64b/66b encoding,PCIE 3.0 is 128b/130b encoded. W

subway line can search for 4G signals, which makes us think of the Beijing Line 10 line (North Line) has not yet unicom 3G signal, imagine the difficulty of construction and how much resistance. So to cover these underground/indoor areas, it is estimated that more is a "wait" word. 　　3, the high-speed rail is to be able to call, the result is intermittent--railway base station is no longer dense and useless, speed is the biggest killer We've had some experience before the high speed rail cove