l Engin- system will record the maximum capacity of a cableway in terms of eering Science, Longman. volume and weight. As cables are placed within a tray, the system monitors how much of that capacity is used up and warns the user when maximum capacity is reached. The designer will then be able 33.11 Relevant standards to re-size the tray or re-route the cable. The maximum capacity may not equal the theoretical capacity; allowances must be made for Regulatory body Number Subject cables crossing over within the tray which will occupy more space than the sum of the cross-sectional areas of cables. ANSI/ICEA S-80-576-1988 Cable specification PE-71 Cable specification 33.9.2 Computer Aided Cable Management 802.1 Part B Protocols by which different objects can be There are two reasons for using computer aided cable design sys- managed items. Firstly, they will automate the process of material take-offs and will generate the drawings needed for the installer and the 802.1 Part D LAN bridges client. The second reason is that they provide an accurate record of 48007 Cable specification the installed cabling scheme to pass to the client. This is important 802.3i 10BaseT Ethernet over as there will inevitably be a number of changes to the cabling scheme once it comes into use. There will also be a number of faults which will occur, and an accurate record of where everything is will PN2072(CS Building standards for assist greatly in locating the cause of problems. T530) Telecom Media What should be recorded on a computer aided cable layout sys- EIA/TIA Commercial building tem? Obviously all cables should be recorded but this is not of much wiring std value on its own; the user will also want to know what they are connected to. The system should therefore record the items which Type 3 Cabling system connect to the cables, i.e. all kinds of IT and telecoms equipment. Systemax These items should also be identified on the layout as they are useful in assisting with the task of managing the IT infrastructure. BT OSCA CW1700 Cabl