DOCSIS-CMTS-CM-REG-STATUS is an IPDR Service Definition Schema
that defines the Registration status of the CM as perceived by
the CMTS.
DOCSIS 3.0 Operations Support System Interface Specification
CM-SP-OSSIv3.0-I01-061207, Annex N.
The IPDR Record containing one CM registration status instance
representing a single cable modem that has registered with
the CMTS.