Avaya X.25 User Manual Page 31

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X.25 Overview
117377-A Rev. A 1-11
4.
If it finds both matches, it accepts the call, and responds with a call accept
packet that establishes the virtual connection between the two routers.
When the SVC is established, the router can transmit and receive data
(Figure 1-7).
Figure 1-7. Setting Up an X.25 Call Connection
Transmitting Data
After Router B establishes the circuit, data travels between end stations 1.1.1.2
and 3.1.1.2 as follows:
DCE
DCE
X.25 PDN
Call request
Incoming call
1. Send request
Call confirm Call accept
User data
2. Establish connection
3. Encapsulate and transmit data
DCE
DCE
X.25 PDN
DCE
DCE
X.25 PDN
User data
Router A
Router A
Router A
Router B
Router B
Router B
X250008A
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