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WIFI Technology Overview

WiFi is an international Wireless local area network (WLAN) standard, full name Wireless Fidelity, also known as IEEE802.11b standard. WiFi was originally based on IEEE802.11 protocol, published in 1997, defined WLAN MAC layer and physical layer standards. Following the 802.11 protocol, many vers... Read More

Optical eye image debugging

Optical eye image debugging Target: Extinction ratio Research and development stage: between 10-15 (large is better than small), according to the actual situation can be appropriate to improve the extinction ratio, but not too low. It’s related to sensitivity. Quiver Research and develo... Read More

The construction of the test environment

Core and principle of test environment construction: 1. Check whether the optical power exists Generally use optical power to test whether there is optical power; And the optical power of some ophthalmograms is -2dbm, -3dbm, etc. 2. Whether the clock is accurate The clock is the reference infor... Read More

Light eye map basic explanation II

A deep interpretation of jitter If the data rate of the system is increased, the jitter amplitude measured in a few seconds will remain roughly the same, but when measured in a fraction of the time of the bit period, it will increase proportionately with the data rate, resulting in bit errors. Th... Read More

tcpreplay Stream Test Method

Test schematic diagram: System version: Ubuntu16.04 Tcpreplay installation: apt-get install tcpreplay (This version of the NIC name is not called eth0 and eth1, the following configuration changes) eth0 corresponds to ens33 NIC: IP: 172.20.60.166 MAC: ec:a8:6b:82:32:c1 eth1 corresponds to th... Read More

Nirtual local area network

A virtual local Area Network (VLAN) is a communication technology that divides a physical LAN into multiple broadcast domains logically. ​ Each VLAN is a broadcast domain. Hosts within a VLAN can directly communicate with each other, but cannot directly communicate with each other. In this way, b... Read More