Avaya Configuring ATM Services Manual do Utilizador Página 89

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ATM Features and Implementation Notes
5-5
ATM Signaling
ATM signaling allows the router to dynamically establish, maintain, and clear a
switched virtual connection at the UNI. Using a series of messages (as defined by
the Q.2931 standard for signaling protocol [Figure 5-2]), the router
1. Assesses the availability of an ATM endpoint (device).
2. Establishes a connection with that device.
3. Maintains that connection for the duration of data transfer.
4. Clears the connection when the transfer is complete.
Figure 5-2. SVC/PVC Signaling Protocol Stack
Q.2931 Protocol
Q.SAAL
ATM Layer
Physical Layer
ATM Adaptation Layer
(AAL 5)
Data
Encapsulation
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