The optical end machine this understanding of friends should know that the old optical end machine is a point to point optical end machine and node type optical end machine. But now optical terminal, can be composed of SDH ring network, star network, tree network, point to point, point to multipoint and other networking modes.
1. What is point-to-point optical end machine?
Point-to-point optical terminal machine as the name implies, point-to-point refers to a point corresponding to a point, so too much optical fiber is used in network interconnection, resulting in waste. Nodal optical terminal machine is used in highway engineering, different from the former, it is in series. Therefore, a nodal optical terminal can be connected to more than one to sixteen nodes on the line, for the former, greatly saving the use of optical fiber. Active convergence optical end machine, there are several front-end equipment, and then the respective signal transmission together, and finally with a core of optical fiber directly transmitted to the center. Such benefits can save the main road optical fiber.
2, what is the node optical terminal machine?
Nodal optical transceiver is also known as bus optical transceiver, which is accurately defined as an image transmission system using single/dual fiber link networking, also known as link optical transceiver. The technologies used are time division multiplexing (TDM) and ADM, which are commonly used in telecom, and have the advantages of saving fiber resources and prolonging transmission distance.
Due to the limitation of the transmission capacity of the link type optical end machine using ADM technology, TDM and ADM are generally used together. In the case of no surplus optical fiber resources, TDM technology is more used, so that optical communication systems of different business platforms can be completely isolated on the physical transmission of one core optical fiber.
At least 10 video signals can be simultaneously transmitted on one core optical fiber, and the maximum number of nodes can be 16. The remote device of node optical terminal can access one to multiple video signals. Each node supports one independent bidirectional data/bidirectional audio/Ethernet, and one public bus RS-485 data. The remote device can be equipped with optical link protection disk (that is, optical switch), which can automatically isolate faulty nodes to ensure normal operation of other nodes. 10-node cascade optical terminal machine adopts 1.5g optical transmission platform, which can simultaneously transmit 10 channels of video signals on one core fiber, supporting up to 10 nodes. The remote device of node-type optical terminal machine can access 1 ~ 4 channels of video signals, 1 two-way audio channel, 1 two-way data channel and 1 public 485 data channel. The local device can output 10 channels of video, 10 channels of audio, 10 channels of data and 1 channel of public 485 data in real time.