What is the difference between HT20 and HT40


The channel bandwidth in HT20 mode is 20 MHz, and the channel bandwidth in HT40 mode is 40 MHz. Two neighboring 20 MHz channels are bundled to form a 40 MHz channel. One channel functions as the primary channel, and the other as the secondary channel. The primary channel sends Beacon packets and data packets, and the secondary channel sends other packets. When the HT40 mode is used in the 2.4 GHz frequency band, there is only one non-overlapping channel. Therefore, you are not advised to use the HT40 mode in the 2.4 GHz frequency band.
If two neighboring 20 MHz channels are bundled and the center frequency of the auxiliary 20MHz bandwidth is lower than that of the main channel, the value is minus; otherwise, it is a plus. For example, 149plus indicates 40MHz channel is composed of the 20MHz channel with the central frequency of 149 and the 20MHz channel with the center frequency of 153.

Other related questions:
How do I identify different fibers from their appearances
Optical fibers are classified into multimode and single-mode optical fibers: - Multimode optical fibers can be used with multimode optical modules to implement low-cost, short-distance transmission. Multimode optical fibers are classified into OM1, OM2, OM3, and OM4 types. OM1 and OM2 optical fibers are usually orange, whereas OM3 and OM4 optical fibers are usually light green. For specifications of various optical fibers, see the text printed on optical fibers. - Single-mode optical fibers, usually G.652 fibers, can be used with single-mode optical modules to implement long-distance transmission. Single-mode optical fibers are yellow.

What are the differences between the video and presentation?
Videos are output of HD OUT 1 of an HD endpoint based on input of cameras. During a conference, the local site shares the content input from a computer with remote sites, such as excel files, diagrams, or slides.

What are the differences between the vMCU and CloudMCU?
The vMCU is an integrated machine that includes the CloudMCU, SMC2.0, SC, EUA, and OMU. The vMCU is a one-stop video communication solution designed for small- and medium-sized enterprises. The vMCU integrates conference management, media processing, address book, and public-private network traversal functions on one server, supports soft clients and hard terminals using various standards and protocols, and easily implements flexible communication for multiple internal enterprise branches and users.

What are the differences between video and presentation?
Video refers to video streams captured by a camera and output from the HD OUT 1 port of an HD endpoint. Presentation refers to the computer desktop content, such as electronic forms, figures, and slides, which the local site shares with remote sites.

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