The value of tmnxBsxAqpAaSubscriberType specifies the
type of subscriber identified by tmnxBsxAqpAaSubscriber.
The values of tmnxBsxAqpAaSubscriberType and tmnxBsxAqpAaSubscriber
must be set together in a single SNMP multi-variable SetRequest-PDU.
If set to 'unknown(0)', no match on a subscriber is done.