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Q. Classify switching systems. In what way is stored program control superior to hard wired control?
Ans:
Classifications of switching systems are givenin block diagram below:
The SPC gains superiority over hard wired due to following points:
SPC
Hard Wired Control
Flexible
Not Flexible
Slower
Faster
More expensive for
moderate processing
functions
Less expensive for
Moderate, simple and fixed
Processing functions
Easier to implement,
Complex Processing
Difficult to implement,
Complex processing functions
Introducing new services
is easy
Introducing new services is
not easily possible
Easier to maintain
Difficult to maintain
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