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[description], Story, any other text you want to use. Cisco Certification: Cabling Cisco Devices by: www.SemSim.com Unshielded Twisted Pair (UTP) is a cable that has four pairs of wires twisted inside it to eliminate electrical interference. UTP cables are connected using RJ-45 connectors that have eight connector pins. The data equipment that is used for internetworking is classified as Data Terminal Equipment (DTE e.g. router interfaces) and Data Communication Equipment (DCE e.g. A WAN connects DTEs through DCE network). UTP cables are used in many configurations and for different purposes, to form an internetwork including: Straight-through Crossover Rollover Applications of UTP include: Serial transmission Integrated Service Digital Network (ISDN) connections Console connections Modular and fixed interfaces These configurations and applications are discussed below. Straight-Through Cable A straight-through cable is the standard network cable connection and is used to connect the source and destination computers through an internetworking device. Specifically, you can use it to connect a host to a hub or switch Crossover Cable In a crossover cable, the standard RJ-45 cable between the source and destination computers is cross-connected. A crossover cable can be used to connect: Two computers Two hubs A hub to a switch A cable modem to a router Two router interfaces Rollover Cable These Cisco proprietary cables used to connect to a router or switch console port. In a rollover cable (8 pins), RJ-45 connectors are usually present at each ends and are used to connect router and computer ports. Pin 1 on one end of cable connects to Pin 8 at the other end of the cable, similarly, Pin 2 connects Pin 7, and so on. Serial Transmission All WANs use serial transmission, which can pass one bit at a time over a single channel. Cisco provides a 60-pin serial connector for one end of the cable while other end of the cable may be EIA/TIA-232, V.35, EIA/TIA-449, X.21 or others; ISDN Connections ISDN refers to a collection of standards that define a digital architecture that can carry integrated voice and data, using the public-switched network. ISDN BRI (Basic Rate Interface) is a two 64 kbps Bearer channels (2B) plus one 16 kbps Data channel (D) service. ISDN BRI terminates at the customer premise with the U interface. Console Connections A console is a type of DTE through which commands are entered into the host device. Most Cisco devices support the RJ-45 console connection. A rollover cable with an RJ-45 connector is used to connect the PC or terminal to the console port of the Cisco device. Modular and Fixed Interfaces Unlike a fixed interface router, a modular interface router allows you to add new interface cards without buying a new router. In the fixed interface series, you refer to the interfaces as: interface_type interface_number For example, the first serial interface on a Cisco 2503 router would be referred to as serial 0. Higher routers have modular interfaces that allow you to change the interfaces as and when required. Here, the interfaces are referred to as: interface_type module_number/interface_number To practice such commands you can download a free CCNA router simulator from SemSim.com and proceed to the troubleshooting 1 exercise that configures ethernet 0 interface.
lcd tv
Important privacy considerations when shopping for lcd tvThe Internet is fast becoming the dominant medium for business and communication, but it still resembles something of a frontier, because there is little regulation. If you are looking for lcd tv then you are doing so in an unregulated marketplace. Most efforts have relied on the Internet industry to police itself. Although there has been some notable success with self-policing, continued abuses have increased calls for government intervention. That's where our role in pre-checking lcd tv sites comes in. Our lcd tv provider is solid and reliable. Some aspects of the Internet could undoubtedly use some regulation, but this task is not as simple as it may seem. The very nature of the Internet makes it difficult, if not impossible to regulate. However in the midst of this many lcd tv retailers survive and prosper. At the same time, the absence of regulations means that everyone who uses this essentially public network can be a target for anyone who has the technical know-how and the will to invade their privacy. Privacy was foremost in our minds when sourcing the right lcd tv retailer for you. Their link appears below. While the threat from hackers is low for individuals, a more serious threat to personal privacy comes from unscrupulous lcd tv companies that operate websites for quick quids. Many lcd tv sites require you to register before you can use its services. Often you must provide personal information, such as your name, street address, and e-mail address. Then as you browse the site, data is collected as to which pages you visited, how long you remained on each page, the links you clicked, what terms you searched, and so on. After a number of visits to the site, a personal profile emerges. The question is, what do lcd tv site operators do with this information? Most claim that they use it to personalize your experience on the site. For instance, if a lcd tv site learns that you are interested in lcd tv, the next time you visit the site, you might be presented with an article or advertisements for that and related products. But some lcd tv websites sell this information to marketers, which means that you may find yourself receiving unwanted catalogs from garden suppliers. Our preferred retailer does not do this. We feel so confident that your lcd tv shopping experience will be a good one that we have built this site so that you can go straight to the prime lcd tv retailer without wasting a lot of time checking out vast numbers of very ordinary providers. Real Time Media On The Net Index
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