Problem Description â–º When service access is slow through the Internet, there is currently a faster access point (dedicated line or BGP). Technology choice: 1. Don't want to use complicated solutions such as CDN. 2. The solution does not need to consider the back-end data synchronization problem. 3. It requires operation and maintenance to have complete control over forwarding. implementation plan: Accelerate business access through Iptables through a Linux server at the acceleration point. Distribution guide First, environmental information Site Information Site A is the service release point, Site B is the transit acceleration point, Site C is the endpoint user access point, and Site D is the comparison site that does not use acceleration. IP address list Iptables: Implementing DNAT and SNAT Forwarding Implementation Tools - CentOS 6 Httping: The host disables ICMP but opens the port 80 to implement the ping function (Linux platform) Httpping: the same as above (Windows platform) Second, configure Linux forwarding IP address configuration Station B: D station: Open Forword Configuring SNAT and DNAT B station configuration: D station configuration: Static routing configuration Station B: Third, test acceleration effect Ping A station from station B and station D, 1000 packets, see the average delay Ping A station from C station, 1000 packets, check the average delay Fourth, the conclusion From the test results, it can be seen that the average delay of using Olympia acceleration is 83ms, and the average delays of D stations and direct access points without dedicated line acceleration are 553ms and 541ms, respectively.
Absolute rotary Encoder measure actual position by generating unique digital codes or bits (instead of pulses) that represent the encoder`s actual position. Single turn absolute encoders output codes that are repeated every full revolution and do not output data to indicate how many revolutions have been made. Multi-turn absolute encoders output a unique code for each shaft position through every rotation, up to 4096 revolutions. Unlike incremental encoders, absolute encoders will retain correct position even if power fails without homing at startup.
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