On-Premises vs Off Premises
- On-Premises 内部部署或一次性购买, 内部部署软件和硬件指通过资本支出进行购买软硬件, 成为用户专用的资源.
- Off-Premises 与On-Premises相对立, 用户不需要购买软硬件(不产生软硬件采购和部署成本)而是向服务提供者订购功能服务, 一般按实际使用量和使用时长计费.
以在线存储服务为例:
- 向运营商按年或月付费就可以使用的网盘空间就是典型的Off-Premises, 用户不需要购买硬盘, 也不需要考虑为硬盘提供电网和服务器即可随时随地访问自己存储在云盘的文件. 最大特点就是要按时和按用量持续付费.
- 大型企业一般自己购买专业的云存储服务器和硬盘, 并为这个服务器供应电网, 企业内部员工会被IT分配一个账号来使用自己的存储空间, 方便企业内部文件交流. 这种存储服务仅供本企业内部使用, 由于软硬件已经在部署初期购买完成, 后续就不需要向任何第三方按照使用时间或用量支付费用.
Video Splitter - 视频分配器
HDMI 分配器
CEC
允许单个遥控器在多达 15 个连接设备上运行功能, HDMI CEC 为休闲用户带来的第一个也许是最有用的功能是能够将一个遥控器用于所有音频设备的最常见功能。对于此示例，您可能需要进入电视的设置并激活 CEC，通常在常规设置中找到。设置好所有设备后，您的电视遥控器应与电视同时打开 A/V 接收器或条形音箱，并控制其中任何一个 A/V 设备的音量
ARC - 音频回传通道
ARC 执行的另一个重要功能是通过单个连接发送“上游”和“下游”的音频信号，这意味着信号可以通过单个 ARC HDMI 端口进出设备. “下游”是指从光源（例如蓝光播放器）“向下”传递到另一个设备的信号. “上游”将意味着在相同的电缆上以相反的方式发送信号, ARC 可以简化电缆连接
eARC - 增强型音频回传通道
eARC (Enhanced Audio Return Channel ) 是 HDMI 2.1 的新标准功能，旨在通过电视提供最佳音频分辨率, 支持回传无压缩的Dolby Atmos 和 DTS：X 等 3D 环绕声格式. HDMI 2.1 以前, 解码像 Dolby Atmos 这样的高比特率音频 通常需要将源设备直接插入兼容的音频/视频接收器，条形音箱或有源扬声器，因为大多数电视仅限于输出压缩环绕声甚至立体声音频。使用 eARC，您将能够将 HDMI 设备直接插入电视，然后电视将直接从 eARC 端口将未压缩的高质量音频发送到条形音箱，接收器或放大器。
VRR - 帧数信号同步技术
VRR lets a gaming source deliver video frames as fast as it can, which in many cases is slower than the normal static refresh rate. Graphics processors require different absolute periods to render each frame, and this time is dependent upon the complexity of the scene, the horsepower of the GPU, the resolution selected and the frame rate. When the GPU is taxed by the other three factors and does not finish rendering the next frame by the time it needs to be displayed, the source must either repeat the current frame or display the partially-rendered next frame, which causes judder and tearing. By waiting until the next frame is ready to transport it, a smoother gaming experience can be provided to the user. 类似于AMD显卡的frame-lock技术.
Multi-Stream Transport (MST)
Multi-Stream Transport is a feature first introduced in the DisplayPort 1.2 standard which allows multiple independent displays to be driven from a single DP port on the source device. The displays can be connected using a hub, or by daisy-chaining, or any combination of the two. There's no technical difference between daisy-chaining and a hub, from a topology perspective they're both a branch device. In less technical terms, a monitor capable of daisy-chaining is simply embedding a hub. Theoretically, up to 63 displays can be supported, but the combined data rate requirements of all the displays cannot exceed the limits of a single DP port (17.28 Gbit/s for a DP 1.2 port, or 25.92 Gbit/s for a DP 1.3/1.4 port). With the release of MST, standard single-display operation has been retroactively named "SST" mode (Single-Stream Transport).
Daisy-chaining is a feature that must be specifically supported by each intermediary display; not all DisplayPort 1.2 devices support it. Daisy-chaining requires a dedicated DisplayPort output port on the display. Standard DisplayPort input ports found on most displays cannot be used as a daisy-chain output. Only the last display in the daisy-chain does not need to support the feature specifically or have a DP output port. DisplayPort 1.1 displays can also be connected to MST hubs, and can be part of a DisplayPort daisy-chain if it is the last display in the chain.
The host system's software also needs to support MST for hubs and daisy-chains to work. While Microsoft Windows environments have full support for it, Apple operating systems currently do not support MST hubs or DisplayPort daisy-chaining as of macOS 10.13 ("High Sierra").
DisplayPort-to-DVI and DisplayPort-to-HDMI adapters/cables will not function from a daisy-chain output port. They can, however, be used with DisplayPort MST hubs.
MST is supported by USB Type-C DisplayPort Alternate Mode, so standard DisplayPort daisy-chains and MST hubs do function from Type-C sources with a Type-C to DisplayPort adapter without any conversion.
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