Telecommunications equipment protection

The telecommunication devices are routers (to find out how the information package), hubs (for connecting a large number of users to networks), bridges (for pairing networks with different protocols exchange), modems. And all this in combination with communication server.
Where all this telecommunications equipment, which, incidentally, is usually one of the most expensive components of the network data can be applied?

At the physical principles underlying the lines of communication, the following types of communication:

1. The easiest case is the normal local area network to a large number of users. Earmarked for a sufficiently large area, which could include several servers with clearly defined for each of these tasks (mail server, database server, applications, print, etc.). In this case, the network typically consists of several switching hubs, which include routers and hubs. By the same nodes connect individual users. Such a network to work depends not only on servers but also equally from the switching nodes. Imagine a bank operator, who when serving the customer suddenly loses communication with the server database, and thus can not comply with the customer order. Naturally, it can cause discontent quality customer service and provoke him to transfer their money to another bank, which means direct losses for the bank. This is just a simplistic example.
2. The second case is an expanded version of the first when it comes to distributed networks scale enterprises located in different buildings or even in different cities. In this case of good telecommunications hubs will depend functionality of entire branches or offices, including remote from central servers. There are many examples of different banking applications built on the basis of global networks. One payment system SWIFT. Another example MICEX, which is arranged on the basis of client server technology, where the server is located in the territory exchanges, and customers are authorized banks connected to the server via telecommunications nodes and working terminals. Thus works and global IP REUTERS. These two types of global networks (WAN, Intranet) may be different, as well as telecommunications equipment used in them, but switching hub / telecommunications as a structural unit will be present everywhere, and its efficiency will depend on the number of profits extracted Bank with the help of an application.
3. Another example, prompts this list, knots of accessing the Internet. Normally, such a node consists of modems (in the case of communication server), routers, servers with software, which guarantees protection from NSD. Typically, this commercial units owned company providing Internet services. The popularity of this company will depend on the quality of services offered, ie the efficiency of its telecommunications hub. One can imagine the angry client, who failed in the process of exchanging data occurred at the end of file transfer length of a few megabytes. For him, this loss of time and money (and it can happen and more critical for business losses), because everything must begin anew. And it may not how many are concerned that the site off the power supply.
4. And the last in this article (but not in life) example of where it is important to ensure an independent power supply. This is all familiar. Office (not only) telephone exchanges (PBX). What allows a company to continue its business, even if the entire building lost electricity? Correctly, the opportunity to telephone calls, but this is only possible if there is an autonomous UPS at ATS. So, all this allows us to make a fundamental conclusion, all critical nodes, switching nodes / telecommunications / ATS, should be as independent from external power supply network, ie, equipped with its autonomous UPS. What ARS products suitable for this? The company ARS certified their products to protect this class of telecommunications equipment directly from its producers. Among them are known to all: 3Com, AT & T, Bay Networks, Cabletron, Cisco, New Bridge, Nortel Networks, UB Networks, etc.