PART TWO in Software

Painting Quick Response Code in Software PART TWO

PART TWO
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The easy way to keep patch and equipment cords short is to locate the horizontal wire terminations and the hubs in the same rack The terminations might be on connecting blocks, with cross-connects to patch panels, or directly to patch panels You can use wire management panels to route the patch wires to the side rails and down to the hub Most modern wire termination blocks feature a very high connection density, so they should not take up much rack space Also, patch panels with 96 or more jacks consume very little vertical rack space So, it should be possible to place both equipment and terminations in the same rack, with plenty of room for future expansion of both A popular alternative mounting scheme is to place the wiring terminations in wall mountings and place the LAN hubs in relay racks This hybrid approach is serviceable, as long as the equipment cord runs are not too long from the wall to the racked hubs In a variation to this approach, you could place the connecting block terminations on the wall, as before, and run cross-connect jumpers to patch panels in relay racks Then, relatively short equipment cords could be connected between the patch panels and hubs in the same rack Remember that the cross-connect jumpers count as part of the 5-m (16-ft) limit To patch or not to patch, that is the question You can get into a considerable debate with some wiring managers of large facilities about this very question There is definitely a downside to the use of patch panels in a large facility The problems with patch panels are that they are an added expense, provide an additional point of failure, may provide questionable long-term connections, and add lots of spaghetti-mess (from the myriad of patch cords that must be used) Their modular connectors may also add unnecessary crosstalk If connections to the hubs can be made with cross-connect wires, you may be able to avoid the use of patch panels altogether Simply terminate your station cables on the connecting block of your choice and run a cross-connect jumper over to a mass-termination connector for the hub The larger card-cage hubs offer port connections on 50-pin telco connectors, among other options The hub s 50-pin connectors can be extended to connecting blocks, such as the 110 system blocks, and the cross-connects can be made directly to the station punchdowns, without using patch panels The patchless approach has at least three disadvantages First, troubleshooting is more difficult, as you cannot simply unplug a modular equipment cord and insert a tester You must either disconnect the cross-connect wire and use a test jack adapter that fits onto the connecting block, or you must have used one of the types of connecting blocks with a built-in disconnect capability and still use a test adapter Second, it is much more difficult, on average, to locate the connections for a particular station cable, since the circuit markings are imbedded in the high-density connecting block Third, you may double the potential workmanship problems For example, if you had directly terminated on a patch panel, that would be the only
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field termination that might have excessive untwist or other problems The patch cords would hopefully be factory terminated, carefully inspected, and certified With cross-connection, you add four points for potential workmanship problems: the connecting block, the two end connections of the cross-connect jumper, and the multicircuit termination leading to the hub Which is right for you That may depend on the size of your facility and the training of LAN maintenance personnel The patchless approach should probably be avoided in TRs having under 100 to 200 connections, unless you have trained people with the ability to do complex wire tracing and the workmanship skills to make high-quality connections
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