What do DCT 1, DCT 2, and other abbreviations in networks mean?

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DCT stands for Discrete Cosine Transform, a mathematical technique used in signal processing and image compression. In the context of mobile networks, DCT1, DCT2, DCT3, and DCT4 refer to different types of compression algorithms or standards used for encoding data. These variations are typically associated with specific phone models and their capabilities in handling data transmission. When selecting a phone type in programs, understanding these distinctions helps users choose the appropriate DCT that aligns with their device's specifications, especially if their specific model is not listed.
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Guys what do these simply mean DCT 1, DCT 2 and others.. As used in networks.. I just what a brief explanation.. to basically differentiate them. I have followed up, it's abbreviation for Discrete cosine transform.
 
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Any replies guys.. I actually found this in some programs that required me to select phone type like Nokia 9500 and others, in the list the DCT2, DCT3, DCT4 were included, my phone type is not in the list that is why i have to at least understand what do they mean so that i can select one of them if required... Thank you!
 

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