Space division switch

TANSTAAFL:What happens in stage 2 when more than 8 calls come in? You get blocking. Figure b) is better but requires more crosspoints. Therefore we have to come to some kind of compromise.

Having large k (in second stage) reduces the blocking probability but increases cost.

Switching

TANSTAAFL:What happens in stage 2 when more than 8 calls come in? You get blocking. Figure b) is better but requires more crosspoints. Therefore we have to come to some kind of compromise.