Standard No.:	YD/T 846-1996
English Name:	Frame-synchronization control and indication signals in audiovisual system
Chinese Name:	视听系统中帧同步的控制与指示信号
Chinese Classification:	M13    Communication network architecture
Professional Classification:	YD    Professional Standard - Telecommunication
Issued by:	Ministry of Posts and Telecommunications
Issued on:	1996-05-22
Implemented on:	1996-11-1
Status:	abolished
Abolished on:	2009-12-01
Language:	English
File Format:	PDF
Word Count:	4500 words
Price(USD):	130.00
Delivery:	via email in 1~3 business day

数字的视听业务由将有关信号复用到一个数字通道的传输系统提供。除了音频、视频、用户数据和远程信息处理（telematic）信息外、这些信号中还包括使系统正常运行所需的信息。这类附加信息称为控制与指示（C&I）信号，这是因为其中有些比特确实用于“控制”。使系统中某些地方的状态发生变化而另外一引起比特则为用户提供系统运行情况的指示。