Avaya Configuring ATM Services Manual de usuario Pagina 48

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Configuring ATM Services
2-8 114056 Rev. A
Figure 2-5. ATM Adaptation Layer 5
Service Records and Virtual Circuits
ATM devices communicate using virtual circuits. These VCs transmit and receive
ATM cells containing upper-layer protocols. Bay Networks ATM routers use
service records to provide a way of creating logical interfaces (within the physical
ATM interface) for these upper-layer protocols. In essence, these service records
allow you to
Organize multiple VCs into logical groups
Create direct, point-to-point connections
Assign, delete, and modify upper-layer protocols for just one PVC, or for a
group of VCs, at any given time
Note: AAL 5 does not attach an SAR header or trailer to the PDU.
Service data unit (SDU)
SAR PDU
ATM cell
SDU
SAR PDU
SAR PDU
ATM cell
ATM cell
AAL 5
Convergence
sublayer
AAL 5
SAR
layer
ATM
layer
AAL
layer
Service
class
Trailer
ATM0005A
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