DOCSIS-CMTS-TOPOLOGY-TYPE is an IPDR Service Definition Schema that defines the RF topology information that shows the connectivities of downstream and upstream channels to the fiber nodes within the CMTS. Revision History: 3.5.1-A.1 Initial version. 3.5.1-A.2 Revised version includes ECN OSSIv3.0-N-10.0914-3 and published as I12. 3.5.1-A.3 Revised version includes ECN CCAP-OSSIv3.1-N-18.1979-3. 3.7-A.3.0.0 New revision naming convention. 3.7-A.3.0.1 Update namespace from mibs to www. Fix import versions. Error corrections announced via errata sheet attached to CM-SP-OSSIv3.0-C01-171207. Contact: Postal: Cable Television Laboratories, Inc. 858 Coal Creek Circle Louisville, Colorado 80027-9750 U.S.A. Phone: +1 303-661-9100 Fax: +1 303-661-9199 Email: data-model-support@cablelabs.com Copyright 2019-2026 Cable Television Laboratories, Inc. All rights reserved. DOCSIS 3.0 Operations Support System Interface Specification CM-SP-OSSIv3.0-C01-171207. This IPDR record contains the association of upstream and downstream channels to each unique pair of MD-CM-SG and Fiber Node.