DOCSIS-CMTS-CM-US-OFDMA is an auxiliary schema that defines the CM's status information for OFDMA upstream channels. Revision History: 3.5.1-B.1 Initial version. 3.5.1-B.2 Per ECN CCAP-OSSIv3.1-N-20.2110-2: Updates definitions for MeanRxMer, StdDevRxMer, and ThresholdRxMerValue to clarify these values are reported in units Hundredth dB, per ECN CCAP-OSSIv3.1-N-20.2110-2. 3.7.1-B.3 Updates to definitions based on Jira OSSIDM-1168 3.7-B.3.0.0 New revision naming convention. 3.7-B.3.0.1 Change db to HundredthdB. 3.7-B.3.0.2 Update namespace from mibs to www. Fix import versions. Revised version includes ECN CCAP-OSSIv3.1-26.2430-1. 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 3.1 CCAP Operations Support System Interface Specification CCAP-OSSIv3.1-26.2430-1 This data type enumerates the CM-STATUS events which a CM can utilize to report a Partial Service situation. none Used when the channel is not in partial service secondaryChanMddTimeout Receipt of a CM-STATUS event type 1 indicating secondary channel MDD timeout lostFecLock Receipt of a CM-STATUS event type 2 indicating QAM/FEC lock failure on a downstream channel iuc13CwErrors Codeword errors are over limit on IUC 13 of an OFDMA channel. The criteria for this decision are vendor-specific other Partial service is the result of a reason not described by the other defined enumerations This attribute is the lower of the CCAP’s maximum supported upstream frequency and the CM’s maximum supported upstream frequency. It indicates the highest upstream frequency the CCAP can use to receive signals from this CM taking into account the capabilities of both devices. hertz Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmRegStatus::MaxUsableUsFreq This attribute is the total received power in a specified OFDMA channel, normalized to power in a 1.6 MHz bandwidth, at the RF input port of the CMTS for a given CM. dbmv Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::RxPower DOCSIS Physical Layer Specification, CM-SP-PHYv4.0-I06-221019, October 19, 2022, Cable Television Laboratories, Inc. Upstream Channel Power section. This attribute is the mean of the dB values of the RxMER measurements of all active subcarriers. The mean is computed directly on the dB values as follows: Mean = sum of (RxMER dB values) / number of RxMER values MeanRxMer is reported in units Hundredth dB. HundredthdB Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::MeanRxMer This attribute is the standard deviation of the dB values of the RxMER measurements of all active subcarriers. The standard deviation is computed directly on the dB values as follows: StdDev = sqrt(sum of (RxMER dB values - RxMER_mean)^2 / number of RxMER values) StdDevRxMer is reported in units Hundredth dB. HundredthdB Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::StdDevRxMer This attribute specifies the percentile (such as 2nd percentile or 5th percentile) of all active subcarriers in an OFDM channel at which the ThresholdRxMerValue occurs. That is, (Percentile) % of the subcarriers have RxMER less than or equal to the ThresholdRxMerValue. percentile Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::RxMerThreshold This attribute is the RxMER value corresponding to the specified RxMerThreshold percentile value. The CCAP sorts the subcarriers in ascending order of RxMER, resulting in a post-sorting subcarrier index ranging from 1 to the number of active subcarriers. If the percentile value corresponds to a non-integer post-sorting subcarrier index, the post-sorting index is truncated (floor function is applied); that is, the post-sorting index is selected which is the greatest integer less than or equal to the corresponding percentile value. For example, if there are 3677 active subcarriers and the 2nd percentile is specified, the CCAP computes floor(3677*0.02) = 73. That is, the RxMER value of the 73rd subcarrier in the sorted list is associated with the 2nd percentile. ThresholdRxMerValue is reported in units Hundredth dB, but is only accurate to a quarter dB. db Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::ThresholdRxMerValue This attribute is the frequency in Hz of the highest-frequency subcarrier having RxMER = ThresholdRxMer value. hertz Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::ThresholdRxMerHighestFreq This attribute represents microreflections received on this upstream channel. dbc Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::Microreflections This attribute represents microreflections received on this upstream channel. 19.0734 ps Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::Microreflections This attribute has a value 'true' to indicate that the CM's upstream channel has been muted via CM-CTRL-REQ/ CM-CTRL-RSP message exchange. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::IsMuted MAC and Upper Layer Protocols Interface Specification, CM-SP-MULPIv3.1-I25-230419, April 19, 2023, Cable Television Laboratories, Inc. Media Access Control Specification section. This attribute denotes ranging status of the CM on this upstream channel as reported by the CMTS. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::RangingStatus MAC and Upper Layer Protocols Interface Specification, CM-SP-MULPIv3.1-I25-230419, April 19, 2023, Cable Television Laboratories, Inc. Media Access Control Specification section. other aborted retriesExceeded success continue timeoutT4 This attribute returns the current CM-STATUS Event Code which indicates the reason that this CM is experiencing Partial Service with a bonding group utilizing this upstream OFDMA channel. A value of 0 indicates that the CM is not currently experiencing Partial Service involving this OFDMA channel. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::CurPartialSvcReasonCode This attribute returns the date and time when the MAC indicated that this CM recovered from its most recent Partial Service incident on this upstream OFDMA channel. A value of January 1, year 0000, 00:00:00 indicates that the CM has not experienced Partial Service involving this OFDM channel during the CCAP's history of this CM. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::LastPartialSvcTime This attribute returns the last CM-STATUS Event Code which indicates the reason that this CM was experiencing Partial Service on this upstream OFDMA channel. (Note: if the CM is currently experiencing Partial Service, this is the Event Code from the previous Partial Service event.) A value of 0 indicates that the CM has not experienced Partial Service involving this OFDMA channel during the CCAP's history of this CM. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::LastPartialSvcReasonCode This attribute returns the number of Partial Service incidents the MAC layer has reported for this CM on this upstream OFDMA channel. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::NumPartialSvcIncidents This attribute reports a value of 'true' to indicate that the FDX-capable CM's upstream channel is a Full Duplex Upstream Channel contained within an FDX Full Duplex Ssub-band. A non-FDX-capable CM always reports a value of 'false'. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 CmtsCmUsOfdmaChannelStatus::FdxEnabled