why is an additional decoder needed to watch tv via IPTV when the modem is already a decoder?

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why is an additional decoder needed to watch tv via IPTV when the modem is already a decoder?

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Modem is not a decoder. It is a device that handles incoming and outgoing data packets.

Decoder are hardware or software that decode the combined data packets to actual image and sound

Modems is note decoders, they are demodulators. Modem stands for modulator-demodulator.

Modems convert data from a digital format to a format appropriate to transmit on an analog channel.

IPTV is video in a compressed digital format and you need something that can convert it to the raw video data that a display can show. It can be built into the TV or be an external device,

IPTV can also be encrypted so you need things that decrypt the signal before you get a digital video you can decompress. That is usually built in to the device that decodes it.