A firmware update was recently released for the NVR6XX-4KS2 series devices.
Information, instructions, and download links can be found Here
Accessories/EoC Transmitter/LR1002 1ET
From Dahua Wiki
- Converts between CAT5E/CAT6 and Coaxial Cable Transmission
- Extends EoC Long-distance Transmission to non ePoE-enabled Edge or Head-end Devices.
- Supports PoE Transmission, up to 1000 m (3280 ft)
- Supports IEEE802.3af and IEEE8022.3at Power Supply Standards
- Supports the IEEE802.3 and IEEE802.3u Standards
- Supports MDI/MDX Self-adaptation