Google Nexus 7 tablet specifications and features such as: 7 inch IPS TFT WXGA touchscreen 1280 x 800 pixels resolution with scratch-resistant Corning Glass, 1.2 GHz quad-core ARM Cortex-A9 NVIDIA Tegra 3 chipset, 1 GB of RAM, Android 4.1 Jelly bean (original), 1.2 front facing camera, 4325 mAH Li-Po battery, Bluetooth and Android beam. Google Nexus 7 user manual guide is your source to operate your Nexus 7 tablet for better performance. 
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No other ASUS Z270 (PRIME, STRIX, MAXIMUS, TUF, or WS) motherboard mentions a 'dual interconnect' on this comparison.
The ROG STRIX Z270H GAMING motherboard product page (https://www.asus.com/ca-en/Motherboards/ROG-STRIX-Z270H-GAMING/) doesn't explain this 'dual interconnect' feature.
Raja's EDGE UP guide for Z270 motherboards (http://edgeup.asus.com/2017/01/03/z270-motherboard-guide/3/) doesn't mention 'dual interconnect' (or Z270H) anywhere.
My googles show that nobody seems to really know what 'dual interconnect MAC and PHY' really means or really does. I understand what the MAC and PHY are but not how a direct hardware link between them could be implemented or what it is meant to accomplish. Some people speculate that it's some kind of hardware optimization for combining/merging bandwidths (or for reducing latencies) across/between multiple network ports.
But the Z270H has one RJ45 LAN port (for one Intel I219V), no other LAN ports, and no WLAN (WiFi or BT) hardware.
So what exactly is this dual interconnect hardware feature, what does it do, what advantage can it provide over non-interconnected hardware?
Is this a real hardware spec or a (mistranslated?) piece of marketing fluff?
Edit: As an aside, I notice a lot of inconsistencies in the motherboard spec/comparison entries. Sometimes details are included, sometimes they're not, often they're ordered differently or otherwise offset from each other. It makes direct side-by-side comparisons somewhat cumbersome. I think somebody at ASUS should clean the ASUS website up a little for consistency, lol, at least for current products. Not mentioning any names, but certain competitor websites are far more slick and professional in this regard.
Do I get a Maximus Code or a Strix Z270E or Strix Z270H or a TUF Mark 1 .. not an easy decision, lol.
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Asus Prime Z270-a Manual
Click on the left of the menu to launch the menu bar. The AI Suite 3 screenshots in this manual are for reference only and can vary depending on motherboard model. From the Desktop, click or tap Start All apps ASUS AI Suite 3. The screenshots of AI Suite 3 in this user manual are for reference only. Are you looking driver or manual for a Asus PRIME Z270-AR Motherboard? Do you have the latest drivers for your Asus PRIME Z270-AR Motherboard? You can see device drivers for a Asus. Asus PRIME Z270-P Computer Equipments Motherboard download pdf instruction manual and user guide.
Asus Prime Z270 A Memory
Asus Prime Z270-k User Manual
ASUS PRIME Z270-A LGA1151 ATX Motherboard Replaced by the ASUS PRIME Z370-A LGA1151 ATX Motherboard This excellent Z270 ATX motherboard features with 5X Protection III for dependable stability, fantastic DDR4 performance, two M.2 slots, lightning. Mar 18, 2017 Let’s continue Intel’s Kaby Lake’s hype train this month with the ASUS Prime Z270-A motherboard. Designed as the next evolution of ASUS motherboards, the Prime series of shows how ASUS engineers are passionate about empowering everyone to enjoy the benefits of DIY PC customization, tuning, and making advanced enthusiast controls easily accessible to the consumer.