Das / T-DMB, What Does Das / T-DMB Mean

Das / T-DMB, what does Das / T-DMB mean


DAS is direct attached storage, and its full English name is direct attached storage. Chinese translation is "Direct Attached Storage". As the name suggests, in this way, the storage device is directly connected to the server through a cable (usually SCSI interface cable). I / O (input / output) requests are sent directly to the storage device. Das, also known as SAS (server attached storage). It depends on the server, which is a stack of hardware without any storage operating system. Applicable environment of Das 1) servers are geographically dispersed, and it is very difficult to interconnect them through San (storage area network) or NAS (network direct storage) (a typical example is the branch of a store or bank); 2) when the storage system must be directly connected to the application server (such as Microsoft cluster server or the "original partition" used by some databases); 3) applications including many database applications and application servers need to be directly connected to the memory, and groupware applications and some mail services are also included. The typical Das structure is shown in the figure. For the environment with multiple servers or PCs, the initial cost of using Das may be relatively low. However, under this connection mode, each PC or server has its own storage disk, so it is difficult to reallocate the capacity; For the storage system management in the whole environment, the work is cumbersome and repetitive, and there is no centralized management solution. Therefore, the overall cost of ownership (TCO) is high. At present, DAS is basically replaced by NAS. The following is a comparison of DAS and NAS.

T-dmbt-dmb is a terrestrial digital multimedia broadcasting system launched by South Korea. Strictly speaking, it is still an international standard in Europe. The standard is based on Eureka 147 digital audio broadcasting system developed by European manufacturers, and some modifications have been made to broadcast air digital TV programs to handheld devices such as mobile phones, PDAs and portable TVs.

T-DMB system, including 1 DMB monitoring system, 2 video encoders, video gateway and multiplexer, can provide flexible services, including video broadcasting, audio broadcasting and separate traffic / news / weather channels. T-DMB uses ITU-T H.264 to encode video and MPEG-4 BSAC to encode audio. Then, MPEG-4 synchronization layer and MPEG-2 transport stream are used to process video, audio and additional data. Some basic modules are similar to dvb-h.

T-DMB has entered the commercial stage in Korea. South Korea has issued a new license to T-DMB broadcasting operators. DVB-H and T-DMB have their own advantages and disadvantages.

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