barcode in vb.net 2005 Patch Panels, Cross Connects, and Patch Cords in Software

Encoding QR Code 2d barcode in Software Patch Panels, Cross Connects, and Patch Cords

Patch Panels, Cross Connects, and Patch Cords
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FIGURE 812 RJ-Style Category 7 module and patch frame (Courtesy Kerpen)
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Another consideration with RJ-style Category 7 patch panels is certainly that they may be confused for lower-category patches The confusion arises because the connectors not only resemble normal Category 5e/6/AC6, but are mechanically compatible You can easily plug a lower category patch cord into an RJ-style Category 7 patch panel, but you would not have Category 7 performance, and it is unlikely that any application that required Category 7 speeds would operate properly The rule-of-thumb here is that the category of the link is the category of the lowest component, including cabling, patches, and cords Category 7 operation requires that all of these components be Category 7 certified Patch cords for Category 7 operate in the same manner as those for lower categories They basically connect between patch panel ports and equipment ports on servers, routers, and other network equipment The cable for Category 7 is larger in diameter than cable for the lower categories, to accommodate the shielding, and you must plan on a larger bend radius Patch cords are identical to user cords, and are described in more detail in 9
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User Cords and Connectors
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Highlights
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Modular user cords Modular cable-end connectors RJ-45: What s in a name Connector pin-outs 8-pin modular wiring patterns Modular cord assembly
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LAN Wiring Technology
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This chapter will describe the various types of connectors that are used to terminate cable ends We have previously covered station cable termination, so this section will concentrate on the 8-pin modular plugs that are used on freestanding cables such as patch cords and user cords (sometimes called user cables) We will also look at the user cords that are used in the work areas and the equipment rooms for connection to network hardware This is a good time to point out the distinction between cables and cords as used here and in many of the standards Obviously, both cables and cords used in telecommunications employ jacketed, multi-paired cables, but it is customary to refer to the flexible, stranded-wire, plug-terminated cables that connect to workstations, hubs, and patches as cords This is the convention followed by most of the standards The usage rule is probably more consistent when referring to patch cords, which are inevitably referred to as cords The terms user cord and user cable are used interchangeably, as are the terms equipment cord and equipment cable For consistency in this book, we have tried to use the word cable to refer to any solid-conductor cables that are terminated in a jack or punchdown, and use the word cord to refer to any stranded-conductor cables that are terminated in modular plugs With regard to coax cables, they are normally referred to as cables, regardless of their location By the same token (pun intended), IBM data connector cables are normally referred to as cables Both of these last cable types are identical in composition and termination whether they are used in the wall or by the equipment user
Cable-End Connectors
We will primarily cover modular cable connectors in this chapter Coax connectors and IBM data connectors are considered legacy connectors and are covered in Appendix B Fiber-optic connectors are described in s 6, 7, and 11 and will not be covered here Of the three other types of connectors, the modular connector is obviously the most favored for modern LAN wiring, because of the increasing use of unshielded twisted-pair cable Coax has long been used for traditional Ethernet and ARCnet LANs, but is gradually being phased out in most locations The data connector is an important connector in shielded twisted-pair wiring systems, and it is now included in the TIA-568-C standard Modular Connectors The modular connector used in LAN systems is the same connector that is used in modular telephone wiring systems This connector is available in several possible
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