Chapter 4: Switched networks

Chapter 4: Switched networks

1. Increasing complexity of networks

   • Large telephone switches
   • Cabinet infrastructure for cabling
   • Small PBX systems

2. Elements of a convergent network

   • Control of calls
   • Voice messaging
   • Mobility
   • Answering machine

3. Hierarchy in the switched networks without borders

   • Hierarchy
   • Modularity
   • Recovery capacity
   • Flexibility

4. Access, distribution and central core layers

   • Access layer
   • Distribution layer
   • Core core layer

5. Function of the switched networks

   • Quality of service
   • Additional security
   • Compatibility with wireless networking and connectivity technology
   • Compatibility with new technologies, such as IP telephony and mobility services

6. Form factors

   • cost
   • Port density
   • Alignment
   • Reliability
   • Port speed
   • Buffers for frames
   • Scalability

7. Switch forwarding methods

   • Storage and shipping switching
     • Verification of errors
     • Automatic buffer storage
   • Switching by cutting method
     • Fast frame forwarding
     • Free of fragments

8. Relief of network congestion

   • High port density
   • Big buffers for frames
   • Port speed
   • Fast internal switching
   • Low cost per port