Avaya Configuring ATM and MPLS Services Uživatelský manuál stáhnout pdf (Strana 39)

100

101

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

ATM cell

AAL 5

convergence

sublayer

AAL 5

SAR

layer

ATM

layer

AAL

layer

Service

class

Trailer

ATM0005A

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