PHYSICAL HYBRID TOPOlogy
Physical Hybrid Topology — uses a combination of connected bus, star and ring topologies
- Usually, a physical bus topology forms the backbone, with multiple physical star topologies branching off this backbone.
- The backbone is installed through each building with a star topology used to branch out to the final workstations.
- All hybrid topologies have a single transmission path between any two nodes.
- The primary topology of most organisations’ networks.
- Allow for expansion, new branches can be added by simply connecting central nodes and branching out to the new workstations.
Examples of physical hYBRID topology
- FDDI (Fibre Distributed Data interface) and SONET(Synchronous Optical Network) — usually configured as physics rings and always operates as logical rings.
- Both use optic fibre as the transmission media.
- Both protocols use two physical rings with data circulating in different directions on each ring.
- FDDI — can be used for LANs, however it is commonly used for longer distance high speed connections.
- Usually used for connecting an organisations buildings.
- Distances should not exceed 30km
- Both rings can be used for data transmission, which effectively doubles the speed of data transfer.
- SONET — used for greater distances
- Distances can excess 100km.
- For long distance applications ,the second ring is gained solely as a backup should should a fault occur in the primary ring.
- FDDI — can be used for LANs, however it is commonly used for longer distance high speed connections.
aDVANTAGES AND DISADVANTAGES OF PHYSICAL HYBRID TOPOlogy
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dISADVANTAGES
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