If ethernet cables have a transmission limitation of 100 m (328 ft), how do the extenders work for 400 ft, 492 ft etc.? Will I need a switch too?

Ethernet is a networking protocol. So when you say ethernet cables have a limit of 100m, that limit only applies to the electrical signalling of the ethernet protocol. These extenders don't implement ethernet at all and don't care about the limits or specifications of that protocol. They use the 4 copper pairs in a standard CAT5e/6/7 cable to transmit the HDMI (and some other things) from one end to the other. You cannot connect this to a switch or any other ethernet device. It won't work, and it could potentially blow up or blow up your networking device since it uses a proprietary electrical interface which may push more power than ethernet is designed to accept. The main confusion here is that people refer to CAT5/5e/6/7 cables as ethernet cables. They are not. They are CAT5/5e/6/7, STP/UTP cables. The CAT number/designation tells you something about the physical properties of the copper cabling inside, and whether or not it is shielded. All of these cables are capable of carrying ethernet, and that is their most common use nowadays, especially for consumers. But at the end of the day, ethernet is just one of many signalling protocols that can be used.

Can this device be used only to send RS-232 signal 200' away? I'm not sure what "passthrough" means?

This unit will pass RS232 command from transmitter to receiver up to 200' away. Jackson Support Team J-Tech Digital, Inc

Can this do both 4k/60 and 1080p/120?

It can do 4K/ @60Hz but not 1080/ @120Hz. Only 1080p/ @60Hz Jewel Support Team J-Tech Digital, Inc

Does this product display 4K @ 60 frames per second?

Yes, this unit can support 4K @ 60Hz. Jackson Support Team J-Tech Digital, Inc

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𝟒𝐊 𝟔𝟎𝐇𝐙 𝟒:𝟒:𝟒 𝐇𝐃𝐑 | 𝐓𝐑𝐀𝐍𝐒𝐌𝐈𝐓𝐓𝐄𝐑 𝐋𝐎𝐎𝐏 𝐎𝐔𝐓 - Transmit 4K@60Hz 4:4:4 HDR HDMI Signals up to 394 ft. (120m) via HDBaseT. Transmit 1080p up to 492 ft. (150m) over a single Cat5e/6 cable. Connect a display to the transmitter’s HDMI output port to view the signal being sent to the receiver. Bullet Point 𝐁𝐈-𝐃𝐈𝐑𝐄𝐂𝐓𝐈𝐎𝐍𝐀𝐋 𝐈𝐑 & 𝐂𝐄𝐂, 𝐑𝐒-𝟐𝟑𝟐 𝐏𝐀𝐒𝐒 𝐓𝐇𝐑𝐎𝐔𝐆𝐇 - Control your source from your display/receiver side, or vice-versa via Bi-Directional IR. Pass RS-232 or CEC commands from source to display or from display to source via Bi-Directional CEC & Bi-Directional RS-232 pass-thru. 𝐏𝐎𝐖𝐄𝐑 𝐎𝐕𝐄𝐑 𝐂𝐀𝐁𝐋𝐄 & 𝐄𝐃𝐈𝐃 𝐏𝐀𝐒𝐒𝐓𝐇𝐑𝐎𝐔𝐆𝐇 - Take advantage of the Power over Cable feature and power both your transmitter and receiver from only one power adapter. Power adapter can be placed on either the transmitter or receiver side for maximum convenience. The JTECH -UHDT-150 passes your display’s EDID information to your source device so that you can avoid signal compatibility issues all together. 𝐃𝐎𝐋𝐁𝐘 𝐕𝐈𝐒𝐈𝐎𝐍 & 𝐃𝐎𝐋𝐁𝐘 𝐃𝐈𝐆𝐈𝐓𝐀𝐋 + 𝐒𝐔𝐏𝐏𝐎𝐑𝐓𝐄𝐃 - Enjoy the latest digital content the way it was intended. JTECH-UHDT-150 supports 4K 60Hz 4:4:4 signals and HDR / HDR-10 / Dolby Vision metadata. Supported surround sound formats include Dolby TrueHD, DTS HD Master and Dolby Digital +. 𝐅𝐫𝐞𝐞 𝐋𝐢𝐟𝐞𝐭𝐢𝐦𝐞 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 - All J-Tech Digital products include a One-Year Manufacturer Replacement Warranty and free lifetime technical support from our customer support team located in Sugar Land, TX. Support is available from 9AM – 6PM CST, Monday through Friday. Contact information available on our seller page.

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