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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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

Product ID: 70583979

Details

Brand
TP-Link
Colour
Black
Compatible devices
Desktop Laptop
Data link protocol
Gigabit
Data transfer rate
1000 Megabits
Hardware interface
Ethernet

⚡1 Gbps Full-Duplex Speed

📶550m Fiber Extension

🔌Auto MDI/MDIX Port

55895CFA

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Description

🚀 Convert Fiber to Ethernet Like a Pro—Stay Connected, Stay Ahead!

EXTENDED FIBER REACH - Stretch your network up to 550 meters with multi-mode fiber—perfect for sprawling office setups.
VERSATILE DEPLOYMENT - Works standalone or integrates with TP-Link chassis for scalable, professional-grade networking.
BLAZING GIGABIT SPEED - Experience seamless 1000Mbps full-duplex data transfer for ultra-fast network performance.
PLUG PLAY SIMPLICITY - Auto MDI/MDIX support means zero cable hassles and instant connectivity.
CRYSTAL CLEAR NETWORK STATUS - Front-panel LED indicators keep you effortlessly informed on your network’s health.

The TP-Link MC200CM is a high-performance media converter that bridges 1000BASE-SX multi-mode fiber and 10/100/1000Mbps RJ45 Ethernet. Supporting full-duplex gigabit speeds and auto MDI/MDIX, it extends fiber connections up to 550 meters with easy-to-read LED status indicators. Designed for professional environments, it offers flexible deployment options and reliable, low-power operation at just 1.66W.

Specifications

ASIN	B003AVRLZI
Are Batteries Included	No
Best Sellers Rank	66,101 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 84 in Network Transceivers
Brand	TP-Link
Colour	Black
Customer Reviews	4.4 4.4 out of 5 stars (226)
Date First Available	23 Mar. 2012
Guaranteed software updates until	unknown
Item Weight	408 g
Item model number	MC200CM
Manufacturer	TP-LINK USA
Power Source	Corded Electric
Product Dimensions	20.4 x 6.5 x 16.51 cm; 408.23 g
Series	Gigabit Multi-mode Media Converter
Voltage	5 Volts

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