1. Chap 8 Design and Documentation Andres, Wen-Yuan Liao Department of Computer Science and Engineering De Lin Institute of Technology andres@dlit.edu.tw http://www.cse.dlit.edu.tw/~andres

2. Overview • Network Design and Documentation • Document brainstormed ideas, problem solving matrices • Wiring closet specifications • Wiring and electrical techniques used in network building

3. Basic Network Design and Documentation • General design process • Network design issues • General network design process • Network design documents

4. General design process • Layer 1 design • A logical and a physical topology • Layer 2 LAN topology • Reduce congestion and collision domain size • Layer 3 topology • Break up both collision and broadcast domains.

5. Network design issues • Gather information about the organization • Make a detailed analysis and assessment of the current and projected requirements • Identify the resources and constraints of the organization

7. Network design documents • Engineering journal • Logical topology/Physical topology • Cut sheets • Problem-solving matrices • Labeled outlets/Labeled cable runs • Summary of outlets and cable runs • Summary of devices, MAC addresses, and IP addresses

8. Wiring Closet Specifications • Overview of wiring closet selection • Size • Environmental specification • Walls, floors, and ceilings • Temperature and humidity • Lighting fixtures and power outlets • Room and equipment access • Cable access and support

9. Overview of wiring closet selection • MDF:Main Distribution Facility/Facilities IDF:Intermediate Distribution Facilities

13. Size • The horizontal cabling runs must be attached to a central point in a star topology • The central point is the wiring closet • Where the patch panel and the hub must be installed

14. Size • TIA/EIA-569 • A minimum of one wiring closet • Additional wiring closets for each 1,000 m2

16. Environmental specification • Power supply and heating/ventilation/air conditioning (HVAC) issues • Be secure from unauthorized access • Meet all applicable building and safety codes

17. Walls, floors, and ceilings • Bear the load • MDF: 4.8 kPA (100 lb/ft²) • IDF: 2.4 kPA (50 lb/ft²) • Raised floor • Accommodate incoming horizontal cables • Floor coverings should be tile

19. Temperature and humidity • Maintain a room temperature of approximately 21° C • No water or steam pipes running through or above the room, with the exception of a sprinkler system • Relative humidity should be maintained at a level between 30%-50%

20. Lighting fixtures & power outlets • A minimum of two dedicated, non-switched, AC duplex electrical outlet receptacles, each on separate circuits • Florescent lighting should be avoided for cable pathways because of the outside interference that it generates

21. Room and equipment access • The door of a wiring closet should be at least .9 m wide, and should swing open out of the room, thus ensuring an easy exit for workers • The lock should be located on the outside

22. Room and equipment access • Allow 48 cm for the panel to swing out from the wall • A distribution rack, then it must have a minimum 15.2 cm of wall clearance for the equipment, plus another 30.5-45.5 cm for physical access by workmen and repairmen

23. Cable access and support • If a wiring closet serves as an MDF, all cable running from it should be protected by 10.2 cm conduit or sleeved core • All horizontal cabling that runs from work areas to a wiring closet should be run under a raised floor

24. Cable access and support • Any wall/ceiling openings that provide access for the conduit, or sleeved core, must be sealed with smoke and flame-retardant materials

26. Identifying Potential Wiring Closets • Topology as floor plan • Selecting potential locations • Determining number of wiring closets • Identification practice

27. Topology as floor plan • In order to determine the location of a wiring closet • Drawing a floor plan of the building • Adding to it all of the devices that will be connected to the network • Computers, printers and file servers

30. Selecting potential locations • Identify secure locations that are close to the POP • The POP is where telecommunications services, provided by the telephone company, connect to the building's communication facilities

32. Determining number of wiring closets • Use your compass to draw circles: a radius of 50 m from potential hub locations • If overlap, eliminate one of the hub locations • To see if one of them is closer to the POP than the other(s)

34. Horizontal and Backbone Cabling • Catchment area problems • MDF location in a multi-story building • Example of where you would use multiple wiring closets • Cabling for MDF and IDF connections • Backbone cabling media • TIA/EIA-568-A requirements for backbone cabling • Maximum distances for backbone cabling

35. Catchment area problems • If the 100 m catchment area cannot provide enough coverage, it can be extended by using repeaters • 100 Ohm UTP (four pair) • 150 Ohm STP-A (two pair) • 2 fiber (duplex) 62.5/125 µm optical fiber • Multimode optical fiber

37. MDF location in a multi-story building • The MDF is usually located on one of the middle floors of the building • The POP might be located on the first floor, or in the basement

40. Cabling for MDF and IDF connections • Backbone cabling: vertical cabling • Connect wiring closets to each other

41. Backbone cabling media • TIA/EIA-568-A • 100 Ω UTP (four-pair) • 150 Ω STP-A (two-pair) • 62.5/125 µm multimode optical fiber • Single-mode optical fiber • The IDF is sometimes referred to as the horizontal cross-connect (HCC) • The MDF is sometimes referred to as the main cross-connect (MCC)

43. Only one

47. Electricity and Grounding • Differences between AC and DC • AC line noise • Electrostatic discharge • Grounding electrical current in computer equipment • Purpose of grounding computer equipment • Safety ground connections • Safety ground connection problems

48. Differences between AC & DC • DC flows at a constant value when circuits are turned on • AC rises and falls in current values