Ethernet Topologies

 10 Mbps Topologies

10Base-T

• (10 = 10 Mbps; Base= Baseband; T = Twisted Pair)
• 10 Mbps, baseband over UTP.
• Usually wired in a physical star with a hub or multiport repeater. Internally it uses a bus signaling system like other Ethernet configurations
• Maximum segment length 100 meters (328 feet).
• Minimum between computers 2.5 meters (8 feet).
• 1024 nodes maximum on the LAN
• Category 3, 4 or 5 UTP.
• RJ-45 connectors, 4 twisted pair.
• Coaxial or Fiber backbone for larger LAN's

10BaseT UTP NETWORK LAYOUT
Limitations

• maximum segment length of 100 Meters
• Hub to Hub or repeater to repeater links limited to 100 Meters

Rules

• star topology
• 4 repeater/5 segment rule of 10Base5 is retained
• only two nodes per segment are allowed

Cabling

• RJ-45 Connectors
• Category 3 UTP minimum, preferably Category 5

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10Base-2

• (10 = 10 Mbps; Base= Baseband; 2 = 2x 100 meters)
• 10 Mbps, baseband over thinnet.
• Uses bus topology.
• Maximum segment length 185 meters (607 feet).
• Minimum between computers 0.5 meters (20 inches).
• Maximum of 30 computers per segment.
• Obeys 5-4-3 rule: Five segments, joined by four repeaters, 3 populated giving a total length of 925 meters (3035 feet).

Physical Bus Cable Limits
10Base2 THIN ETHERNET NETWORK LAYOUT
Limitations

• maximum number of trunk segments = 5
• maximum trunk segment length = 607 feet (185 meters)
• maximum network trunk cable = 3035 feet (925 meters)
• maximum number of stations on a trunk segment = 30
• minimum distance between T connectors = 1.5 feet (0.5 meters)

Rules

• each end of the trunk segment is terminated in 50-ohms
• one of the terminators is grounded
• connector splices are kept to a minimum

Cabling

• BNC-T type connectors
• RG58-AU 50-ohm cable, 0.2"
• Note that you can't mix RG58 /AU and RG58 /U cable on the same network.

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10Base-5

• (10 = 10 Mbps; Base= Baseband; 5 = 5 x 100 meters)
• 10 Mbps, baseband over thicknet.
• Also called Standard Ethernet
• Designed to support a backbone for a large department or building. Transceivers attach to the thicknet cable and the cable AUI connector plugs into a repeater . The branching segments of thinnet plug into the repeater and connect to the computers on the network.
• Uses bus topology.
• Maximum segment length 500 meters.
• Minimum between transceivers 2.5 meters (8 feet)
• 100 computers per segment, 300 per network.
• Obeys 5-4-3 rule: maximum distance can be extended to 2500 meters (8200 ft) using 4 repeaters and 3 populated segments.
• Transceiver is attached to main segment with a vampire tap.
• DIX or AUI connector is used to attach the transceiver to the network card. Maximum computer to transceiver distance is 50 meters. This distance is not included in the 5-4-3 calculation.

10Base-5 Summary
 

Maximum segment length	500m (1640 ft)  Typically used as backbone to connect Thinnet-based network.
Speed	10 Mbps
Maximum taps	100
Maximum segments	5
Maximum repeaters	4
Maximum segment with nodes	3  Due to attenuation, only 3 of 5 segments can actually contain network connection. Other 2 segments can be used to connect the network over long distance.
Maximum nodes per segment	100
Maximum nodes for network	300
Minimum distance between nodes	2.5m (8 ft)
Maximum overall length with repeaters	2.5 km
Maximum AUI drop cable length	50m

 

1. 10Base-F?
• (10 = 10 Mbps; Base= Baseband; FL =fibre optic)
• Allows long cable runs between repeaters, like between buildings
• Maximum segment length 2000 meters.
•  10BaseFL - Used for linking computers in a LAN environment.
•  10BaseFP - Used for linking computers with passive hubs from maximum cable distance up to 500m
•  10BaseFB - Used as a backbone between hubs.
•  Baseband signal over a fiber-optic cable.
•  Need concentrator (fiber-optic hub) ® Star wired (star topology) . Either active or passive
•  Long distance.
•  Very expensive. Difficult to install.
 Maximum segment length - 2000m  Maximum segments- 1024  Maximum segment with nodes- 1024  Maximum nodes per segment- 1  Maximum nodes per network- 1024  Maximum hubs in a chain- 4