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Cross-connect wire pairs are introduced to the row in the same way, through the slot just above each contact row, but punched down on the inner contact of each clip The cross-connect wire overlaps the station wire that was punched into the outer contact, but the color code of each should still be visible When punching, take care that the punchdown tool is turned the correct way so that the excess wire, and not the intended connection, gets trimmed off The tendency to fan the wires out, and the amount of untwist that exists where the wires of a pair pass through the side slots, creates a problem for higher wiring categories, such as Category 5e and 6 The contact clip also is a rather large piece of metal that can contribute to impedance mismatch and crosstalk at higher frequencies For that reason, old-style standard 66M blocks are not suitable for use above Category 3 Most manufacturers have introduced low-crosstalk 66 blocks that are rated to Category 5e, but that s about as far as the venerable 66 block will go Even with these special blocks, the normal wiring technique of one-wire-per-slot can still cause an unacceptably high amount of crosstalk If special 66 blocks are used for Category 5e, the wire pair should be inserted intact through the side slot between the two target contact rows, rather than split and run through two side slots The wires of each pair are then wrapped up or down (whichever is appropriate) into the contact and terminated You must be meticulous about rotating the punchdown tool, or you will accidentally cut the wire you are attempting to terminate, as well as jamming the remaining stub of wire that should have been cut off into the jaws of the contact However, this method maintains the amount of untwist well under the 1/2-in maximum, and it can help you achieve the category of operation you seek Unfortunately, this technique also makes reading of the color stripes on the wires difficult after termination, so you should be very methodical when wrapping the wires to be sure you do it right the first time A subsequent termination on the inner contact will make the color stripes of the wires on the outer contact of that row almost impossible to discern Many accessories, including adapters, bridging clips, and plug-on jacks, exist for the 66M block Virtually all of these are inappropriate for use in permanently installed LAN wiring systems The most stable connection system for LAN wiring is to use cross-connect wires between punchdown blocks and patches, or to terminate directly on the patch and skip the punchdown block altogether A version of the 66 block incorporates 8-pin modular jacks into the assembly The jacks are mounted in groups of four or so at the side of the mounting bracket This type of block may eliminate the need for a separate patch panel However, it is more difficult to see and access the jacks on the side of the block, and potential wire management methods are poor In addition, you must be certain that the assembly
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is data-grade, so that some twist is maintained between the jacks and the 66 block s clips This arrangement must not be used for Category 4 or 5 operation, unless it is certified to those specifications Several methods may be used to mount the 66M in a permanent location Most commonly, the block may be directly mounted on a backboard The typical backboard is a 4 8 sheet of 3/4-in plywood, securely fastened to the wall and painted an appropriate color, such as battleship gray The 66-block assembly is actually made up of two pieces, a front block that contains the contacts and molded side slots, and a stand-off bracket that mounts to the backboard The bracket is normally mounted to the backboard before the 66M is attached Two slotted, mounting holes are located on the upper left and lower right corners of the bracket The slotted arrangement allows the mounting screws to be preinstalled on the backboard before the bracket is mounted This two-piece structure, bracket and block, allows easy alignment and quick mounting, and facilitates the use of preassembled mounting frames After the bracket is mounted, the 66 block is set on top and secured by four clips that are part of the bracket Connectorized 66 blocks have the connector mounted to the bracket, with the front block already attached, and must be installed as a unit In addition to direct mounting on a backboard, the 66M may be mounted in a preassembled mounting frame A typical distribution frame is shown in Fig 78 The frames are mounted as a unit onto wooden backboards, although some of the frames may be mounted on standard 19-in rails as well These frames usually have
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FIGURE 78 A typical distribution frame for 66 block (Courtesy of The Siemon Company)
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