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
functions
|
Difficult to implement,
Complex processing functions
|
|
Introducing new services
is easy
|
Introducing new services is
not easily possible
|
|
Easier to maintain
|
Difficult to maintain
|