{"id":54163,"date":"2019-12-19T00:00:00","date_gmt":"2019-12-18T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/chto-takoe-zona-frenelya-i-ccq-client-connection-quality-ili-fundamentalnye-faktory-kachestvennogo-besprovodnogo-mosta"},"modified":"2020-02-18T14:02:08","modified_gmt":"2020-02-18T11:02:08","slug":"chto-takoe-zona-frenelya-i-ccq-client-connection-quality-ili-fundamentalnye-faktory-kachestvennogo-besprovodnogo-mosta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/administrirovanie\/chto-takoe-zona-frenelya-i-ccq-client-connection-quality-ili-fundamentalnye-faktory-kachestvennogo-besprovodnogo-mosta","title":{"rendered":"What is the Fresnel zone and CCQ (Client Connection Quality) or fundamental factors of a quality wireless bridge","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Content<\/h3>\n

\nCCQ \u2014 what is it?<\/a><\/noindex>
\nThree main factors affecting the quality of CCQ.<\/a><\/noindex>
\nFresnel zone \u2014 what is it?<\/a><\/noindex>
\nHow to calculate the Fresnel zone?<\/a><\/noindex><\/p>\n

In this article, I want to talk about the fundamental factors in building a quality wireless bridge, as many \"network builders\" believe that it is enough to buy quality networking equipment, install it, and get 100% performance from it \u2014 which, in the end, not everyone achieves.
\n<\/a><\/noindex>
\n<\/a><\/noindex><\/p>\n

CCQ \u2014 what is it?<\/h2>\n

\nCCQ (Client Connection Quality) translates from English as \"the quality of client connection\" \u2014 which basically shows the percentage ratio of theoretically possible to the currently available bandwidth of the channel, in other words, the percentage of achieved bandwidth compared to the maximum possible on specific equipment.<\/p>\n

For example, if you are using equipment with a maximum possible bandwidth of 200 Mbps, but the current channel is 100 Mbps \u2014 in this case, CCQ equals 50%.<\/p>\n

In networking equipment Mikrotik<\/a><\/noindex> and Ubiquiti<\/a><\/noindex> there are two separate indicators
\nTx. CCQ (Transmit CCQ) \u2014 data transmission rate.
\nRx. CCQ (Receive CCQ) \u2014 data reception rate.<\/p>\n

\"What
\n<\/a><\/noindex><\/p>\n

Three main factors affecting the quality of CCQ<\/h2>\n

\n1. Alignment of the two antennas.<\/b> When speaking of a \"point-to-point\" wireless bridge, it is clear that the antennas must be aimed at each other as accurately as possible, \"eye to eye.\"<\/p>\n

If a Wi-Fi bridge is needed for \"point-to-multipoint\" \u2014 you must initially plan the entire architecture from the provider's sector antenna to the client antennas so that they intersect as accurately as possible.<\/p>\n

2. Presence of noise in the channel.<\/b> Before deciding on the frequency of the Wi-Fi bridge, you must check each frequency for noise, and based on this check, choose a less crowded frequency.
\n<\/a><\/noindex>
\n3. Fresnel zone.<\/b><\/p>\n

Fresnel zone \u2014 what is it?<\/h2>\n

\nThe Fresnel zone is the volume of the radio-wave channel between the two antennas.<\/p>\n

\"What
\n
\nThe maximum volume of the channel is located at the central point between the two antennas. <\/p>\n

To achieve the best signal quality, you need to select the cleanest zone, free from physical obstacles as well as radio-wave interference (as mentioned in the second point).
\n<\/a><\/noindex><\/p>\n

How to calculate the Fresnel zone?<\/h2>\n

\nThe formula for calculating the Fresnel zone at its central point:<\/b><\/p>\n

\"What
\n
\nD \u2014 distance (km)
\nf \u2014 frequency (GHz)<\/p>\n

The formula for calculating the Fresnel zone at any point, for example at the location of an obstacle:<\/b><\/p>\n

\"What
\n
\nf \u2014 frequency (GHz)
\nD1 \u2014 the distance to your desired calculation point from the first antenna (km)
\nD2 \u2014 the distance to your desired calculation point from the second antenna (km)<\/p>\n

By carefully considering these three factors, you will ultimately achieve a stable wireless bridge with the highest possible data transmission speed.
\n
Source: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 CCQ \u2014 \u0447\u0442\u043e \u044d\u0442\u043e? \u0422\u0440\u0438 \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0445 \u0444\u0430\u043a\u0442\u043e\u0440\u0430 \u0432\u043b\u0438\u044f\u044e\u0449\u0438\u0435 \u043d\u0430 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e CCQ. \u0417\u043e\u043d\u0430 \u0424\u0440\u0435\u043d\u0435\u043b\u044f \u2014 \u0447\u0442\u043e \u044d\u0442\u043e? \u041a\u0430\u043a \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0437\u043e\u043d\u0443 \u0424\u0440\u0435\u043d\u0435\u043b\u044f? \u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0445\u043e\u0447\u0443 \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u0442\u044c \u043e \u0444\u0443\u043d\u0434\u0430\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0445 \u0444\u0430\u043a\u0442\u043e\u0440\u0430\u0445 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0433\u043e \u043c\u043e\u0441\u0442\u0430, \u0442\u0430\u043a \u043a\u0430\u043a \u043c\u043d\u043e\u0433\u0438\u0435 \u00ab\u0441\u0435\u0442\u0435-\u0441\u0442\u0440\u043e\u0438\u0442\u0435\u043b\u0438\u00bb \u0441\u0447\u0438\u0442\u0430\u044e\u0442, \u0447\u0442\u043e \u0432\u043f\u043e\u043b\u043d\u0435 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u043a\u0443\u043f\u0438\u0442\u044c \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0441\u0435\u0442\u0435\u0432\u043e\u0435 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435, \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c 100% \u043e\u0442\u0434\u0430\u0447\u0443 \u043e\u0442 \u043d\u0438\u0445 \u2014 \u0447\u0442\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-54163","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47What is the Fresnel zone and CCQ (Client Connection Quality), or the fundamental factors of a quality wireless bridge | ProHoster","description":"What is CCQ? 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