2. NETWORK DESIGN

3. Customer requirements Network topologies Cable choice Hardware TSB 75 TSB72

4. Nature of traffic –Email –Video Security –Of data –Of closets EMI –Fluorescent lighting –Motors Customer Requirements Site –Campus –Occupied –Listed –Run lenghts Future proofing –Bit rates –EMI –Security

5. Customer Requirements Cost –Installation –Maintenance –Long V's Short term Environment –Open plan –Office –Rearrangement frequency

6. CHOICE OF TOPOLOGY DEPENDS ON –LAYOUT OF BUILDING –AMOUNT OF EQUIPMENT TO BE CONNECTED –TYPE OF EQUIPMENT TO BE CONNECTED –PERFORMANCE REQUIREMENTS –COST Network Topologies

7. POINT TO POINT TOPOLOGY –DIRECT CONNECTION BETWEEN TWO PIECES OF EQUIPMENT

8. Network Topologies BUS TOPOLOGY –NODES CONNECTED TO A SINGLE WIRE –PROBLEMS DIFFICULT TO ISOLATE –MAIN CABLE FAILS ENTIRE NETWORK FAILS –EASY TO MODIFY

9. Network Topologies STAR TOPOLOGY –SEVERAL DEVICES OR NODES CONNECTED TO A CENTRAL HUB –RELIABLE – ONE MALFUNCTIONING NODE DOES NOT UPSET THE REST OF THE NETWORK –FLEXIBILITY – NODES CAN BE ADDED OR REMOVED WITHOUT DISRUPTING SYSTEM –MORE CABLE REQUIRED THAN A RING OR BUS TOPOLOGY

10. Network Topologies RING TOPOLOGY – NODES CONNECTED IN CLOSED LOOP – DATA PASSED FROM NODE TO NODE TO TARGET DESTINATION – NODE FAILS - NETWORK MAY FAIL – ADDITION OF NODE ONLY WHEN NETWORK INOPERATIVE

11. Network Topologies PHYSICAL STAR –RING CONFIGURATION –STAR TOPOLOGY

12. Network Topologies COLLAPSED BACKBONE –SIMILAR TO STAR

13. Network Topologies SHARED NETWORK

14. Network Topologies SWITCHED NETWORK

15. Network Topologies

17. UTP FTP, STP, ScTP Wireless Fibre Cable Choice

18. Horizontal EMC (Electromagnetic Compatibility) Not resistant to EMI Crosstalk Not secure Cheap Carries up to Gigabit speeds Distances UTP

19. FTP, STP, ScTP as with UTP but –Better resistance to EMI –Better resistance to Crosstalk –Needs grounding –More expensive (labour) Screened

20. Shared 54Mbps channel Ease of installation No cable Susceptible to EMI Wireless

21. Multimode Singlemode Secure Cost Distances Bandwidth Fibre

22. Copper Fiber Multimode / Singlemode Future proofing Cost Hybrids

23. Central component of star topology Regenerates and repeats data Extended distances Dedicated bandwidth –Switching Same media (e.g.. Ethernet) Switch

24. Connects two LANs together Routes data from source to destination Reduces network traffic Improves performance Relatively high cost Extended distances Mixed media (e.g. Ethernet & token ring) Mixed protocols (.eg. TCP/IP & Novell IPX) Router

25. Zone distribution Open office cabling –Consolidation point Must be at least 15m from telecomms closet Should be limited to serving a maximum of 12 work areas. Located is fully accessible, permanent locations Was known as TSB72 in EIA standards Consolidation point

27. Zone Distribution

28. Advantages –Transition point allowed along 90m –Office divided into zones –Only short run at transition point moved when office moves –Less disruption –Less lost productivity –Work area leads can be lengthened if run is less than 90m –Is not meter for meter (see table) –Leads have higher attenuation TIA/EIA-568-B.1 6.4.2 Consolidation point (TSB 75)

29. Patch leads The connection from the CP to the TO uses solid core copper. The option is available to use a stranded cable but the total maximum length of your link is reduced Stranded cable has 20% higher attenuation so the total length of your link must be reduced Option to use a 26AWG cable –50% higher attenuation –must adjust figure in table accordingly

30. Centralised Optical Architecture –Previously called TSB 72 –Usually for fibre systems –Can use copper –300 meter length limit (including patch cord in TIA/EIA version only) –ISO have 3 link lengths of 300, 500 & 2000 m Also a number of application link lengths –Electronics on one floor –Higher densities on hubs –Less space used 11801 and TIA/EIA-568-B.1