Switching and Routing

• In switching fixed transmission capacity (Channels in Layer 2) is

allocated to served connections.

• Signalling is message passing in order to negotiate Channel

allocations and to switch incoming channels to outgoing ones.

Channels

Channels

1

2

3

1

2

3

Connect Request (A,C)

Signalling(A,B,open Ch1 to C)

Signalling(B,A,Ch1 OK)

Switch

Ch(A,1) connected to Ch(C,3)

A

B

C

Signalling(B,C,open Ch3 to C)

Signalling(C,B,Ch3 OK)

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