The DS200LDCCH1ALA is a LAN communications circuit board developed by General Electric. It is used in GE EX2000 Excitation and DC2000 product lines and is an advanced 7-layer circuit board that is essentially the brains of the EX2000 and DC2000. The primary functions provided by the board include operator interface, LAN communications, drive and motor processing and drive resets. It includes several onboard features including a microprocessor controlled LAN (local area networks) communications, controlled drive and motor processing, operator interface and complete drive resets. There are four microprocessors on the board, providing it with a sweeping coverage of I/O and drive control. The drive control processor is located on the board as position U1 and it provides integrated I/O peripherals, offering abilities like timers and decoders. The second is a motor control processor recognized on the board as U21. Motor control circuitry and I/O (analog and digital) communications are available with this processor. U35 is the location of the co-motor processor. Only used when additional processing is required, this section works to perform advanced mathematics the MCP cannot compute. The final processor found on the board is the LAN control processor in position U18. Five bus systems (DLAN+, DLAN, Genius, CPL, and C-bus) are accepted by this processor.
Operating modes of local area networks
The working mode of a LAN refers to the relationship between the various nodes in the LAN. It can be roughly divided into three types according to the working mode: dedicated server structure, client/server mode and peer-to-peer mode.
I. Dedicated server architecture
The dedicated server structure is also called “workstation/file server” structure, which consists of several microcomputer workstations and one or more file servers connected through communication lines to form a workstation to access server files and share storage devices.
The file server is naturally designed to share disk files as its primary purpose. This is sufficient for general data transfer, but when database systems and other complex applications used by an ever-increasing number of users arrive, the server can no longer take on this task, because as the number of users increases, the number of programs serving each user increases accordingly, and each program is a **** running large file, giving the user the impression of being extremely slow, thus giving rise to the The client/server model.
II. Client/Server mode
The Client/Server model (Client/Server) is referred to as the C/S model. One or several larger computers are centralized for shared database management and access, called the server, while other application processing work is dispersed to other microcomputers in the network to do, constituting a distributed processing system. The C/S architecture is the result of the development and widespread application of database technology combined with the development of LAN technology. The C/S architecture is the result of a combination of the development and widespread use of database technology and the development of LAN technology.
III. Peer-to-peer network
Peer-to-Peer network model (Peer-to-Peer). Unlike the C/S model, in the peer-to-peer network structure, the status of each node is reciprocal, there is no dedicated server, and each node can play the role of both a client and a server if needed.
Peer-to-peer networks are also often referred to as workgroups. Peer-to-peer networks generally use a star network topology, and the simplest peer-to-peer networks are two computers connected directly using twisted-pair cables, such as in a peer-to-peer network, where the number of computers usually does not exceed 10 and the network structure is relatively simple.
In addition to sharing files, peer-to-peer networks can also share printers and other network devices. This means that a printer on a peer-to-peer network can be used by any node on the network, just as easily as a local printer. Because peer-to-peer networks do not require dedicated servers to support the network or other components to improve network performance, peer-to-peer networks are much less expensive than other models of networks. Because of these features, peer-to-peer networks are widely used in homes and other small networks.
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