Streaming media application solution from ATM to desktop

The ATM network also has a solution from ATM to desktop, that is, the full ATM protocol is adopted from the local terminal to the user end. This is the full ATM solution, from the local device to the network device in the system, on the user side, all are in the ATM mode, as shown in 3-2, because of the flash of ATM in the communication technology and market fields, and gradually withdraw from the historical stage, the solution in this way is estimated to have no application instances. However, on the user side, it is possible to use an ATM to connect to the desktop, while on the local side, it is possible to use a networking method shown in Figure 3-1. That is, the user side using the ATM-PON, the user installs a ATM-25 or a higher rate of ATM Nic.

Figure 3-2: Streaming Media System Service solution from ATM to desktop
The ATM-to-desktop mode can implement the functions of the original LAN by means of LAN simulation to provide support for upper-layer protocols such as IP, IPX, and NetBIOS, however, few operators are willing to do so, and no device manufacturer advocates such a solution.
When using ATM to the desktop. It is best to use the TS stream method to encapsulate media data. The direct TS ing of TS streams to ATM cells is as follows: the video data representing each program is encapsulated in a stream data format called MPEG2 SPTS, and the length of each MPEG2 SPTS is 188 bytes. When using the ATM AAL-5 method, the method of carrying SPTS is as follows, the first is the combination of two SPTS, plus an 8-byte tail total 384 bytes, become a AAL-5 CPCS-SDU common part convergence sub-layer service data unit), then a ing process, ing 384 bytes to 8 ATM cells, the 48-byte Net Load of each ATM cell is completely used to carry SPTS data, and the last ATM cell has no padding bytes. However, due to the eight-byte Filling Process in the previous process, the original video stream speed is higher than the original one, and some bandwidth is wasted.