The importance of switching in communication The cost of switching is high Definition: Transfer input sample points to the correct output ports at the.

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Presentation transcript:

The importance of switching in communication The cost of switching is high Definition: Transfer input sample points to the correct output ports at the correct time Terminology Switching Digital switching (sample points amplitudes are 0's and 1's) PABX Circuit Circuit switching Packet switching

Space division

Voice digitization: W=3KHz, sampling at 2*3=6 or 8KHz 256 levels for quantization (8 bits) Bit rate=64Kb/s Telephone switching Time division multiplexing: time slot (0.1 ms), field, frame; 125ms/0.8=150 channels + time for synchronization and control

Switch architecture Sampling input signals, storing values in memory, placing values in the proper field and frame of the output sequence Need for more channels: hierarchical switching Combining time and space switching

General framework for switching time, space and frequency (broadband signals) switching synchronization (single clock) and buffering (memory) set-up time and delay (propagation time) "call duration" assignment vs. dynamic assignment in-band and out-of-band signaling Circuit (synchronous) vs. packet (asynchronous) switching control and routing overhead, virtual packet switching

Switching techniques and networking Switching is the technology allowing to get a message between the nodes of a network Crossbar switching: mechanical (in the past) or electronic. Bus and cable switches: computer buses or cables (switching + transportation = network) Token passing approach (similar to the locks used by multiprocessors connected by a bus) Ethernet approach: cable or ring, packets, conflicts, resending Synchronization and Hub switch: star networks (no conflicts)

Ethernet Cabling

Cable topologies. (a) Linear, (b) Spine, (c) Tree, (d) Segmented.

Switched Ethernet A simple example of switched Ethernet.