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

Drawing Denso QR Bar Code in Software Patch Panels, Cross Connects, and Patch Cords

Patch Panels, Cross Connects, and Patch Cords
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FIGURE 85 Connectorized patch panel
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for connections between the 50-pin connector and each jack is dependent on pair numbering It is customary to connect the pair color codes in the order given in 5 for the wire pairs In other words, pair 1 of a 25-pair (50-wire) cable connects to pins 1 and 26 on the connector, pair 2 connects to pins 2 and 27, etc However, the connections do not go to a 25-pair cable, but lead instead to individual jacks, either four or eight wires at a time So, a 4-pair jack panel connection would have pairs 1 through 4 connected to the first jack, pairs 5 through 8 to the second jack, and so on, in turn, up to the sixth jack (all that can be served by one 50-pin connector) Then, at each modular jack, the pairs are connected in a pattern consistent with either T568A or T568B This distinction is important, as the two patterns reverse the connections for pairs 2 and 3 Remember that T568B is equivalent to Lucent (AT&T) 258A and is probably what you will get if you don t specify You should always specify the patch jacks and connectors to be mapped to T568B or T568A, whichever matches your hub cord You are still free to use a different pattern for the horizontal cable and patch, since it is separate from the hub-to-patch connection Panels that use all eight pins of each jack are clearly identified as to pattern mapping, but panels that use only four pins use a skeleton of one of the TIA pat-
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PART TWO
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LAN Wiring Technology
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terns As we said, hub connections often use only two pairs per port (four wires) to minimize the number of ports per connector Here is an example of the problem of connection mapping Let s say you intend to install a 10/100BaseT network using hubs with multicircuit connectors instead of single port jacks Such hubs typically use a card rack with plug-in cards You will run cables from your hub cards to a patch panel to fan out the individual ports to modular jacks Naturally, you will want the 8-pin modular jacks on the patch to have the same pinouts as a standard 8-pin modular jack on a hub with individual connectors A standard 10/100BaseT modular hub jack defines pin 1 as transmit , pin 2 as transmit , pin 3 as receive , and pin 4 as receive A multicircuit hub connector could assign eight pins to each port, but only four pins are needed for 10/100BaseT, so assigning four pins per port achieves twice the density on the connector For our example, let s say that your hub card connector assigns four pins per port, representing two pairs of the multiconductor cable This gives you a total of twelve 10/100BaseT ports per 50-pin connector The cable connects between the hub card and the patch Now, let s look at the way the ports are mapped from the 50-pin connector to each modular jack on the patch panel Standard 10/100BaseT uses four pins of the 8-pin jack These four pins correspond to two of the regular 4-pair groupings of the jack, pairs 2 and 3 Remember that T568A and B simply reverse the order of these two pairs The first pair for each of the ports on the 50-pin connector usually corresponds to transmit / Now, here is the mapping part: the transmit / pair must connect to pins 1 and 2 on the 8-pin jack, while the receive / goes to Pins 3 and 6, for proper 10/100BaseT connectivity If the patch uses the T568B pattern to connect the patch jack, the transmit and receive pairs will appear on the proper pins But if the patch is wired for the T568A pattern, the two pairs will be in reverse order and the connection will not work (unless the pair order on the 50-pin connector has also been reversed a rare circumstance because the TIA recognizes only the standard color code pattern for that connector, not a pair order) This is one place where the TIA s preferred T568A pattern will get you into trouble Note, however, that all of your modular patch cords, horizontal cable patch panels, and workstation outlet jacks can still use the A pattern The rule is that both ends of a connection must be the same, whether that connection is a horizontal cable, a patch cord, or (yes) a patch panel fan-out of a multicircuit hub port Always ensure that you match the LAN connections on the hub card s connector with the connector-to-jack mapping on the patch panel so that the correct LAN signals will be on the pins of the patch panel jacks
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