Someone wrote that these only work for 1000Mbps;you would think that they would autoneg. 10/100/etc w/ the switch. Can someone else confirm?

I contacted TP-Link to ask them this question. Version 4 of the product supports 10/100/1000 auto-negotiation. Version 3 and older only supports gigabit.

will this give me better speed? i have 100ft cat6 away from modem and only get 14mb down but 80 when connected closer

Yes and better stability. Switch your cable to cat 7 for better speed. If your willing to spend the money, get a 3ft cat7 cable connect that cable from modem to this converter, get a FO cable for 100 ft run ( they are about $40 to $50 on eBay) connect the cable to a second converter at the end of the run and use a 3ft cat 7 cable to connect to your device. By the way on the back of the converter there is a switch that says auto and force, switch it to force. Auto means if your only going to connect this converter to another device and not to another converter. To learn more, go to YouTube for videos on the installation and use of this great product! Good luck!

What size is the dc barrel connector plug on the power adapter? presumably either 2.1 or 2.5 by 5.5 mm? thx!

I do not know. https://www.tp-link.com/us/products/details/cat-43_MC200CM.html This is the url to the device

Can I go ethernet from my router to multimode then back to ethernet after about 200m without out speed loss?

This media converter is rated for gigabit speed. Multimode fiber used at gigabit speed should be good to about 1,000 meters. So, 200m should be a piece of cake. HTH

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🚀 Elevate your network game with fiber-fast, hassle-free connectivity!

EXTENDED FIBER RANGE - Push your network boundaries with up to 550 meters of multi-mode fiber connectivity.
BLAZING GIGABIT SPEED - Seamlessly convert fiber to Ethernet at a full 1000Mbps for ultra-smooth data flow.
PLUG PLAY SIMPLICITY - Auto MDI/MDIX support eliminates cable hassles—just connect and go.
ENERGY EFFICIENT DESIGN - Low 1.66W power consumption means high performance without the energy guilt.
REAL TIME NETWORK INSIGHT - LED indicators keep you effortlessly informed on connection status and activity.

The TP-Link MC200CM is a sleek, black media converter that bridges 1000BASE-SX multi-mode fiber and 10/100/1000Mbps RJ45 Ethernet ports. Supporting full-duplex gigabit speeds and auto MDI/MDIX, it extends fiber connections up to 550 meters with easy-to-read LED status indicators, all while consuming just 1.66W of power. Ideal for professionals demanding reliable, high-speed network expansion.

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Brand	TP-Link
Product Dimensions	20.4 x 6.5 x 16.51 cm; 362.87 g
Item model number	MC200CM
Manufacturer	TP-LINK USA
Series	Gigabit Multi-mode Media Converter
Colour	Black
Voltage	5 Volts
Power Source	Corded Electric
Are Batteries Included	No
Item Weight	363 g
Guaranteed software updates until	unknown

TP-Link Gigabit SFP to RJ45 Fiber Media Converter, Fiber to Ethernet Converter 10/100/1000Mbps RJ45 Port to 1000Base-SX Multi-Mode Fiber (MC200CM) Black

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