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efits of this approach go beyond the telecommunications issues It is also a good idea to provide an orderly system of cable ducts or sleeves, both for interfloor and firewall use Proper ducting will allow workers to place UL-rated firestopping material in the ducts to enhance fire protection Also, because many of the utility shafts are closed and reinforced concrete structures, this avoids the problem of random wall penetrations and sneaker cables that are forced alongside existing pipe and HVAC penetrations Maximum Drop Length LAN wiring standards dictate strict distance limits for horizontal cable runs These cable drop lengths include the entire cable from the point of termination in the telecommunications room to the workstation outlet Standards also cover the maximum distances between telecommunications rooms In this way, the requirements of TIA 568-C and 569-B work together, in balance with the building s architecture, to achieve a compliant wiring system for your LAN that will meet your needed performance The maximum length for a horizontal cable is 90 m (295 ft) This 90 m length excludes the user cord that connects from the outlet to the user workstation (or telephone instrument) and the patch cord (or jumper) that connects from the patch panel (or cross-connect field) to a hub or other device This is a maximum acceptable length and not simply an average length or a goal You should try to keep your wiring well below this length in most cases At least two telecommunications outlets must be provided for each individual work area Although some of the lower-speed LANs, such as 10BaseT and even TokenRing, may run to longer distances of as much as 150 m, exceeding the standard intentionally is a bad idea You cannot expect such run lengths to support 100/1000 Mbps data rates at all, and any equipment problems will be blamed on the excessive drop lengths As a matter of fact, cable testers are required to fail a basic link longer than 90 m, allowing for test cables and measurement accuracy For a complete discussion of measuring cable lengths using cable testers, see 15 The allowable backbone cable distances between telecommunications rooms depend on the type of cable you use as well as practical considerations For example, the standard allows 2000 m (6560 ft) from TR to MC for fiberoptic cable, but only 800 m (2624 ft) for unshielded twisted-pair cable The distances are even less between ICs and the other two types of telecommunications rooms However, practice may dictate much smaller distances If you wish to connect between two telecommunications rooms on a 100BaseT or a gigabit link, for example, you would have to limit the backbone run to the same 90 m you are lim-
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ited to for any hub-to-workstation link As mentioned previously, although some situations may operate with slightly longer cable lengths, they do not meet the requirements for inevitable higher speeds of 100 Mbps or more Estimating Drop Length Cable drops from the proposed telecommunications room to the workstations to be served must be within the maximum allowable length of 90 m (295 ft) You should estimate these distances before finalizing your cable system design If the estimates exceed the maximum length, you may need to add one or more wiring closets Although there are minimum size specifications and features for telecommunications rooms (covered in a later section), you may be justified in putting in a substandard telecommunications space to get the drop lengths down To estimate the total length of a cable run, you must first know how the cable will be routed and hung Conventional wiring is often routed through metal floor or roof supports to keep it well above the ceiling tile Alternatively, cable may be hung with a variety of cable hangers, clips, and tie wraps from supporting structures In some installations, particularly old work, the cable is laid on top of the ceiling tile supporting grid Large buildings frequently have the cable placed in cable trays suspended between the ceiling grid and the floor above This method is becoming more popular for Category 5e/6 installations, where the slightest kink or sharp bend can impair the cable performance Any combination of the methods may be used as well The routing methods are important because the more orderly routings inevitably require more wire For example, routing through cable trays involves lots of right angles (orthogonal routing) instead of diagonal runs, demanding up to 40% more cable On the other hand, laying the cable directly on top of the ceiling grid with direct routing uses the least cable (although it is the hardest to maintain and may suffer EMI problems more often) Cable trays are easiest to use during construction build-out, when the ceiling grid is not in place They are more difficult to add once the offices are constructed or, worse, occupied Trays carry significant weight from the many cables they contain, and must be well secured in place For that reason, cable hangers and clips are often used to minimize disruption to an existing workplace To estimate an orthogonal wire placement, where cables are to be bundled or laid in cable trays, you must calculate the length of run in the tray This may involve a straight run or one with several corners Add each leg of the run in the tray Next, add the drop from the tray to the wall header above the workstation outlet, and the lengths of the vertical drops in the workstation wall and in the telecommunications room, and add a factor for obstacles (2% to 5%, depending upon the building) Obstacles that might be encountered are HVAC units, duct work, firewalls, columns, and pipes The vertical drops should allow for 18 in (05 m) of excess wire at the wall outlet plus the distance through the wall to the height of the cable tray
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