
Configuring ATM Services
4-2
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Defining 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 4-1
), the router:
1. Assesses the availability of an ATM end point (device)
2. Establishes a connection with that device
3. Maintains that connection for the duration of the data transfer
4. Clears the connection when the transfer is complete
Figure 4-1. SVC/PVC Signaling Protocol Stack
Nortel Networks ATM routers support ATM signaling functions as defined in the
ATM Forum ATM User-Network Interface specification (Versions 3.0, 3.1, and
4.0).
Q.2931
Q.SAAL
Protocol
Data
encapsulation
ATM adaptation layer
(AAL5)
ATM layer
Physical layer
ATM0039A
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