Q. What are multistageand single stage networks? Compare strengths and weaknesses of each.
OR
List the key difference in single stage, two stage and three stage Networks. Also explain their blocking characteristics.
Ans:
Single Stage Vs. Multistage Network.
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Sr. No.
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Single Stage
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Multi Stage
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1
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Inlet to outlet connection is via a single cross point.
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Inlet to Outlet connection is via multiple cross points
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2
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Use of single cross point per connection leads to better quality link
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Use of multiple cross points can degrade the quality of a connection.
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3
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Every individual cross point can be used for just one inlet/outlet pair connection.
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Same cross point can be usedestablish connection between some inlet/outlet pairs.
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4
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A specific cross point is required for each specific connection.
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A specific connection may be established by using sets of cross points.
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5
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If a cross points fails, associated connection can't be establish- There is no redundancy.
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Alternative paths and cross-points are available.
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6
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Cross points are inefficiently used. Only one cross point in every row or column of a square or triangular switch matrix is even in use, even if all lines are active.
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Cross points are used Efficiently
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7
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Number of cross points is Prohibitive
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Number of cross points is reduced significantly
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8
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A large number of cross pointsin every inlet/outlet results in capacitive loading.
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There is no capacitive loading problem
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9
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Network is non-blockingin character
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Network is blockingin character
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10
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Time for establishing a call is less
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Time for establishing a call ismore
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