NDI®|HX是第一代基带转换器和PTZ摄像机所使用的NDI协议，它是一种混合协议。设计用于在传统的IP流（如RTSP/RTP）和易于集成的NDI世界之间建立桥梁。虽然设备固件发生了变化，但构建NDI|HX的大部分工作是在接收设备HX驱动程序中完成的。
NDI®|HX2是下一代高效的NDI协议，NDI|HX2是真正的原生NDI流，从源设备一直到目的地。这意味着它是一个比NDI|HX更“干净”的实现，并且可以提供更可靠、更低的延迟和更灵活的连接，它共享NDI的所有一般特性。NDI|HX2可以通过WiFi提供类似Full NDI的画面质量。NDI延迟在很大程度上取决于发送和接收设备中的编解码器实现，但理论上可以低到几帧。
NDI/NDI|HX/NDI|HX2对比：
| Parameter | NDI® | NDI®|HX | NDI®|HX2 |
| Transport | TCP/UDP/Multi-TCP | UDP (TCP) | TCP/UDP/Multi-TCP |
| Image Format | Size / Aspect Independent | Size / Aspect Independent | Size / Aspect Independent |
| Tally Feedback | Yes | Yes | Yes |
| Bidirectional Device Control | Yes | Yes | Yes |
| Integrated Alpha Channel | Yes | No | No |
| Compression | NDI® Codec | HX (H.264) | H.264/H.265 |
| Connection | Socket, Unicast / Multicast and FEC | Unicast/MultiCast | Socket, Unicast / Multicast and FEC |
| HD (1080i) Data Rate | ~ 100 Mbit/s | 8-20 Mbit/s | 1-50 Mbit/s |
| Essence Packing | Discrete Audio, Metadata and Video Frame packets, single connection | Delivered as Discrete Audio, Metadata and Video Frame packets, single connection | Discrete Audio, Metadata and Video Frame packets, single connection |
| Infrastructure | Gigabit / Load Balanced Multi NIC / 10GBit | Gigabit / Wireless | Gigabit / Wireless |
| Service Discovery | Bonjour (mDNS), NDI® Access (manual), Server (NDI®4) | automatic via HX Driver | Bonjour (mDNS), NDI® Access (manual), Server (NDI®4) |
| API | free license, SDK Libraries for Win(x86), Mac, Linux(x86 & ARM), iOS, FPGA reference | hardware encode, Decode with NDI® Libraries | Send with NDI® Embedded SDK, Receive with Free NDI® Libraries |
