This attribute specifies which Classes of Service (CoS) have ingress
Call Admission Control (CAC) applied to them. Ingress CAC
applies only to swithced connections (SVCs and S-SPVCs).
none - Ingress CAC is turned off for all classes of service.
cirOnly - Ingress CAC is applied only to the CIR portion of a
connection's bandwidth requirements for CIR>0 classes of service.
cirAndEir - Ingress CAC is applied to both CIR and EIR portions
of a connections bandwidth requirements for all classes of service.