Circuit Switches

1. Circuit Switches Transmission & Switching NETW601 Tutorial (7) Eng. Hadil Hisham Eng. Mariham Wasfy

2. Circuit Switch Types Space-Division switches: Provide separate physical connection Time-Division switches: Time-slot interchange technique Hybrids (combine Time & Space switching)

3. Circuit Switch Types Space-Division switches: Crossbar space switch Multistage switch

5. Multistage Switch

6. Multistage Switch • If k=2n-1 the multistage switch is non-blocking

7. Example 3-stage switch; see need for k=2n-1 for it to be non-blocking A A B B C C D D E E F F A sends to C; B sends to F; E sends to A; Say F wants to send to E – it cannot use the first switch in the intermediate stage because of E to A connection, it cannot use the second switch because the B to F connection has used up the line to the third switch in the output stage. Hence we need the third intermediate switch

8. Circuit Switch Types Time-Division switches

9. Time Division switch • Time Slot Interchange Switch (TSI)

10. Circuit Switch Types Hybrids (combine Time & Space switching)

11. Time Space Time Switches(TST)

12. TST