A read-only enumerated value reporting the ATM Adaptation Layer type used on this VCC, in practice always aal5 on this system, applicable only when the local VCL endpoint is also the VCC endpoint. AAL5 is the adaptation layer typically used for standard data traffic over ATM, so an admin uses this mainly to confirm the expected adaptation layer is in effect for this connection. An admin verifying a new ATM circuit's configuration would confirm cmAtmVclAalType reports aal5 as expected for standard data traffic rather than an unsupported type.