业内主流的DVR厂商，都在产品资料中称支持完整的TCP/IP协议。TCP/IP协议各厂家不都是一样的吗?其实不然。
The mainstream DVR manufacturers in the industry support the complete TCP/IP protocol in product information. Are all the manufacturers of the TCP/IP agreement the same? Actually, they are not.
TCP/IP(Transmission Control Protocol/Internet Protocol)的简写，中文译名为传输控制协议/网际协议，又叫网络通讯协议，这个协议是是Internet最基本的协议、Internet国际互联网络的基础，虽然从名字上看TCP/IP包括两个协议，传输控制协议(TCP)和网际协议(IP)，但TCP/IP实际上是一组协议，它包括上百个各种功能的协议，如：远程登录、文件传输和电子邮件等，而TCP协议和IP协议是保证数据完整传输的两个基本的重要协议。通常说TCP/IP是Internet 协议族，而不单单是TCP和IP，是因为TCP/IP协议包括TCP、IP、UDP、ICMP、RIP、TELNETFTP、SMTP、ARP、TFTP 等许多协议，这些协议一起称为TCP/IP协议。
TCP/IP(Transmission Control Protocol/Internet Protocol) is translated as the transmission control protocol / Internet protocol, also called the network communication protocol, which is the basis of the most basic protocol of Internet and the Internet international network. Although the TCP/IP includes two protocols, the transport control protocol (TCP) and the Internet Protocol (IP) from the name, TCP/IP is actually a group. Protocol, which includes hundreds of various functions, such as remote login, file transfer and e-mail, and the TCP protocol and the IP protocol are two basic important protocols to guarantee the complete transmission of data. Generally speaking, TCP/IP is a Internet protocol family, not only TCP and IP, because the TCP/IP protocol includes many protocols such as TCP, IP, UDP, ICMP, RIP, TELNETFTP, SMTP, TELNETFTP, and so on. These protocols are called the protocol.
由此可见，一台具备完善网络功能的DVR不单单是指具备TCP和IP两种协议，而且需要具备完整的TCP/IP协议族，这样才能称之为网络硬盘录像机。DVR常见的TCP/IP协议族中的典型应用有很多，下面列举两种比较常见的两种：
It can be seen that a DVR with perfect network function is not only the two protocols with TCP and IP, but also a complete family of TCP/IP protocol, which can be called a network hard disk VCR. There are many typical applications of DVR common TCP/IP protocol family. Here are two more common two kinds:
NTP(Network Time Protocol)是用来使计算机时间同步化的一种协议。视频监控信息是公安机关追查犯罪分子的重要信息源，那么时间上的准确性要求非常高。目前DVR支持的网络校时功能便是由NTP协议来实现的。
SMTP(Simple Mail Transfer Protocol)简单邮件传输协议是一种提供可靠且有效电子邮件传输的协议。具备SMTP协议的DVR便可通过网络将报警信息通过Email发送到客户的邮箱中。
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