Download - NETWORK DESIGN Customer requirements Network topologies Cable choice Hardware TSB 75 TSB72
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NETWORK DESIGN
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• Customer requirements
• Network topologies
• Cable choice
• Hardware
• TSB 75
• TSB72
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• 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
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Customer Requirements
• Cost– Installation – Maintenance– Long V's Short term
• Environment– Open plan– Office– Rearrangement
frequency
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• 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
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Network Topologies
• POINT TO POINT TOPOLOGY
– DIRECT CONNECTION BETWEEN TWO PIECES OF EQUIPMENT
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Network Topologies
• BUS TOPOLOGY
– NODES CONNECTED TO A
SINGLE WIRE
– PROBLEMS DIFFICULT TO
ISOLATE
– MAIN CABLE FAILS ENTIRE
NETWORK FAILS
– EASY TO MODIFY
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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
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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
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Network Topologies
• PHYSICAL STAR
– RING
CONFIGURATION
– STAR TOPOLOGY
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Network Topologies
• COLLAPSED BACKBONE
– SIMILAR TO STAR
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Network Topologies
• SHARED NETWORK
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Network Topologies
• SWITCHED NETWORK
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Network Topologies
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• UTP
• FTP, STP, ScTP
• Wireless
• Fibre
Cable Choice
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• Horizontal
• EMC (Electromagnetic Compatibility)
• Not resistant to EMI
• Crosstalk
• Not secure
• Cheap
• Carries up to Gigabit speeds
• Distances
UTP
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• FTP, STP, ScTP as with UTP but– Better resistance to EMI– Better resistance to Crosstalk– Needs grounding– More expensive (labour)
Screened
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• Shared 54Mbps channel
• Ease of installation
• No cable
• Susceptible to EMI
Wireless
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• Multimode
• Singlemode
• Secure
• Cost
• Distances
• Bandwidth
Fibre
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• Copper
• Fiber
• Multimode / Singlemode
• Future proofing
• Cost
Hybrids
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• Central component of star topology
• Regenerates and repeats data
• Extended distances
• Dedicated bandwidth– Switching
• Same media (e.g.. Ethernet)
Switch
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• 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
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• 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
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Zone Distribution
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• 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 6.4.2Consolidation point (TSB 75)
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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
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• 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
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