Avaya Configuring ATM and MPLS Services Manuel d'utilisateur Page 39

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Understanding ATM, MPOA, ATM Router Redundancy, and OAM
117374-C Rev 00
1-9
Figure 1-5. ATM Adaptation Layer 5
Service Records and Virtual Circuits
ATM devices communicate using virtual circuits (VCs). 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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