DOCSIS-SERVICE-FLOW is an auxiliary schema which defines Service Flow information. Revision History: 3.5.1-A.1 Initial version. 3.5.1-B.1 Revised with some 64-bit data types per DOCSIS 3.1 OSSI 3.7-B.2 Revised with additional Service Flow + Aggregate Service Flow data 3.7-B.2.0.0 New revision naming convention. 3.7-B.2.0.1 Update namespace from mibs to www. Fix import versions. Fix formatting and spacing. 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 For Service Flows, this attribute represents the relative priority of the Service Flow. Higher numbers indicate higher priority. This priority should only be used to differentiate Service Flow from identical parameter sets. This attribute returns 0 if the referenced parameter is not present in the corresponding DOCSIS QoS Parameter Set or if the parameter is not applicable. For Aggregate Service Flows, this attribute represents the relative priority of the Aggregate Service Flow. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::Priority Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::Priority For Service Flows, this attribute represents the 4-byte value of the maximum sustained traffic rate allowed for the Service Flow. It represents all MAC frame data PDUs from the bytes following the MAC header HCS to the end of the CRC. The number of bytes forwarded is limited during any time interval. The value 0 means no maximum traffic rate is enforced. This attribute applies to both upstream and downstream Service Flows. This attribute returns 0 if the referenced parameter is not present in the corresponding DOCSIS QoS Parameter Set, or if the parameter is not applicable. For Aggregate Service Flows, this attribute represents the 4-byte value of the maximum sustained traffic rate allowed for this Aggregate Service Flow. The value of the ParamSetDataRateUnitSetting attribute defines the units of ServiceMaxSustained. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::MaxTrafficRate Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::MaxAggregateTrafficRate For Service Flows, this attribute specifies the token bucket size in bytes for this parameter set. The value is calculated from the byte following the MAC header HCS to the end of the CRC. This object is applied in conjunction with ServiceMaxSustained to calculate maximum sustained traffic rate. If the referenced parameter is not present in the corresponding DOCSIS QoS Parameter Set, this attribute returns 3044 for scheduling types 'Best Effort', 'Non-Real-Time Polling Service' and 'Real-Time Polling Service'. If this parameter is not applicable, it is reported as 0. For Aggregate Service Flows, this attribute represents the MaxTrafficBurst attribute of the Aggregate Service Flow. bytes Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::MaxTrafficBurst Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::MaxTrafficBurst For Service Flows, this attribute represents the 4-byte value of the guaranteed minimum rate allowed for this Service Flow. The value is calculated from the byte following the MAC header HCS to the end of the CRC. The value of 0 indicates that no bandwidth is reserved. If the referenced parameter is not present in the corresponding DOCSIS QoS Parameter Set, this attribute returns 0. If the parameter is not applicable, it is reported as 0. For Aggregate Service Flows, this attribute represents the 4-byte value of the guaranteed minimum rate allowed for this Aggregate Service Flow. The value of the ParamSetDataRateUnitSetting attribute defines the units of ServiceMinReservedRate. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::MinReservedRate Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::MinReservedRate For Service Flows, this attribute specifies an assumed minimum packet size in bytes for which the ServiceMinReservedRate will be provided. The value is calculated from the byte following the MAC header HCS to the end of the CRC. If the referenced parameter is omitted from a DOCSIS QoS parameter set, the used and reported value is CMTS implementation and the CM reports a value of 0. If the referenced parameter is not applicable to the direction or scheduling type of the Service Flow, both CMTS and CM report the value 0. For Aggregate Service Flows, this attribute represents the Assumed Minimum Reserved Rate Packet Size of the Aggregate Service Flow. bytes Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::MinReservedPkt Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::MinReservedPkt The value of the IP Type of Service (DSCP) Overwrite assigned to this service flow. This is encoded as hexBinary in 2 bytes. The first byte is encoding the tos-and-mask, the second byte is encoding the tos-or-mask. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::TosAndMask Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::TosOrMask For Service Flows, this attribute represents the 4-byte value of the rate parameter 'P' of a token-bucket-based peak rate limiter for packets of a service flow. A value of 0 signifies no Peak Traffic Rate is enforced. If the referenced parameter is not present in the corresponding DOCSIS QoS Parameter Set, this attribute returns 0. For Aggregate Service Flows, this attribute represents the 4-byte value of the Peak Traffic Rate allowed for this Aggregate Service Flow. A value of 0 means the peak traffic rate is not limited. The value of the ParamSetDataRateUnitSetting attribute defines the units of ServicePeakRate. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::PeakTrafficRate Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::PeakTrafficRate This attribute specifies the upstream scheduling service used for upstream Service Flow. If the referenced parameter is not present in the corresponding DOCSIS QoS Parameter Set of an upstream Service Flow, this attribute returns the value of 'Best Effort'. For QoS parameter sets of downstream Service Flows, this attribute's value is reported as 'Undefined'. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::SchedulingType Reserved Undefined Best Effort Non-Real-Time Polling Service Real-Time Polling Service Unsolicited Grant Service with Activity Detection Unsolicited Grant Service Proactive Grant Service This attribute specifies the nominal interval in microseconds between successive unicast request opportunities on an upstream Service Flow. This attribute applies only to upstream Service Flows with ServiceSchedule of value 'Non-Real-Time Polling Service', 'Real-Time Polling Service', and 'Unsolicited Grant Service with Activity Detection'. The parameter is mandatory for 'Real-Time Polling Service'. If the parameter is omitted with 'Non-Real-Time Polling Service', the CMTS uses an implementation-dependent value. If the parameter is omitted with 'Unsolicited Grant Service with Activity Detection' the CMTS uses the value of the Nominal Grant Interval parameter. In all cases, the CMTS reports the value it is using when the parameter is applicable. The CM reports the signaled parameter value if it was signaled. Otherwise, it returns 0. If the referenced parameter is not applicable to the direction or scheduling type of the corresponding DOCSIS QoS Parameter Set, both CMTS and CM report this attribute's value as 0. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::NomPollInterval This attribute specifies the maximum amount of time in microseconds that the unicast request interval may be delayed from the nominal periodic schedule on an upstream Service Flow. This parameter is applicable only to upstream Service Flows with a ServiceSchedule of 'Real-Time Polling Service' or 'Unsolicited Grant Service with Activity Detection'. If the referenced parameter is applicable but not present in the corresponding DOCSIS QoS Parameter Set, the CMTS uses an implementation-dependent value and reports the value it is using. The CM reports a value of 0 in this case. If the parameter is not applicable to the direction or upstream scheduling type of the Service Flow, both CMTS and CM report this attribute's value as 0. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::TolPollJitter This attribute specifies the unsolicited grant size in bytes. The grant size includes the entire MAC frame data PDU from the Frame Control byte to the end of the MAC frame. The referenced parameter is applicable only for upstream flows with a ServiceSchedule of 'Unsolicited Grant Service with Activity Detection' or 'Unsolicited Grant Service', and it is mandatory when applicable. Both CMTS and CM report the signaled value of the parameter in this case. If the referenced parameter is not applicable to the direction or scheduling type of the corresponding DOCSIS QoS Parameter Set, both CMTS and CM report this attribute's value as 0. bytes Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::UnsolicitGrantSize This attribute specifies the nominal interval in microseconds between successive data grant opportunities on an upstream Service Flow. The referenced parameter is applicable only for upstream flows with a ServiceSchedule of 'Unsolicited Grant Service with Activity Detection' or 'Unsolicited Grant Service', and it is mandatory when applicable. Both CMTS and CM report the signaled value of the parameter in this case. If the referenced parameter is not applicable to the direction or scheduling type of the corresponding DOCSIS QoS Parameter Set, both CMTS and CM report this attribute's value as 0. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::NomGrantInterval This attribute specifies the maximum amount of time in microseconds that the transmission opportunities may be delayed from the nominal periodic schedule. The referenced parameter is applicable only for upstream flows with a ServiceSchedule of 'Unsolicited Grant Service with Activity Detection' or 'Unsolicited Grant Service', and it is mandatory when applicable. Both CMTS and CM report the signaled value of the parameter in this case. If the referenced parameter is not applicable to the direction or scheduling type of the corresponding DOCSIS QoS Parameter Set, both CMTS and CM report this attribute's value as 0. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::TolGrantJitter This attribute specifies the number of data grants per Nominal Grant Interval (NomGrantInterval). The referenced parameter is applicable only for upstream flows with a ServiceSchedule of 'Unsolicited Grant Service with Activity Detection' or 'Unsolicited Grant Service', and it is mandatory when applicable. Both CMTS and CM report the signaled value of the parameter in this case. If the referenced parameter is not applicable to the direction or scheduling type of the corresponding DOCSIS QoS Parameter Set, both CMTS and CM report this attribute's value as 0. dataGrants Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::GrantsPerInterval For Low Latency Aggregate QoS Profiles, this object specifies packet classifiers assigned to the Low Latency service flow. Each classifier is encoded in hexBinary according to the TLV encoding. When multiple classifiers are specified, they are encoded as the concatenated sequence of encodings for each classifier Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AsfQosProfile::LowLatencyClassifierList MAC and Upper Layer Protocols Interface Specification, CM-SP-MULPIv3.1-I25-230419, April 19, 2023, Cable Television Laboratories, Inc. Quality-of-Service-Related Encodings annex For Aggregate Service Flows, this attribute indicates if the Aggregate Service Flow is being used for Low Latency services. This implies the ASF is describing a Dual Queue SF setup underneath the ASF. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::LowLatencyAsf For Aggregate Service Flows, this attribute represents the coupling factor for the AQMs between the Classic service flow and the Latency service flow. log2(bytes/second) Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::AqmCouplingFactor For Aggregate Service Flows, this attribute represents the scheduling weight, as the implied ratio (out of 256), for the Latency Queue/Service Flow (within the ASF). Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::SchedulingWeight For Aggregate Service Flows, this attribute indicates the Queue Protection status of this Aggregated Service Flow. If AggregateServiceFlowQpEnable is set to QueueProtectionDisabled(0), Queue Protection is disabled. If AggregateServiceFlowQpEnable is set to QueueProtectionEnabled(1), Queue Protection is enabled. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::QpEnable QueueProtectionDisabled QueueProtectionEnabled For Aggregate Service Flows, this attribute represents the latency threshold for the Queue Protection function in the Low Latency Service Flow. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::QpLatencyThreshold For Aggregate Service Flows, this attribute represents the Queuing Score Threshold for the Queue Protection function in the Low Latency Service Flow. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::QpQueuingScoreThreshold For Aggregate Service Flows, this attribute represents the drain rate exponent for the Queue Protection function in the Low Latency Service Flow. log2(bytes/second) Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::QpDrainRateExponent For Service Flows, this attribute represents the configured minimum buffer size for the service flow. bytes Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::MinimumBuffer For Service Flows, this attribute represents the configured target buffer size for the service flow. The value 0 indicates that no target buffer size was configured, and the device will use a vendor specific value. bytes Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::TargetBuffer For Service Flows, this attribute represents the configured maximum buffer size for the service flow. The value 4294967295 indicates that no maximum buffer size was configured, and thus there is no limit to the buffer size. bytes Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::MaximumBuffer For Service Flows, if this attribute is set to 'true', AQM is disabled on the upstream or downstream service flow specified by ServiceFlowId. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::AqmDisabled For Service Flows, this attribute provides the target latency for this service flow when operating under Classic Active Queue Management (e.g., DOCSIS-PIE). This parameter will be ignored if the AQM Algorithm used by the Service Flow is ImmediateAqm. For downstream service flows, the value 256 indicates an unknown latency target. milliseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::ClassicAqmLatencyTarget For Service Flows, this attribute specifies the AQM algorithm in use for this service flow. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::AqmAlgInUse Unknown The value Unknown(1) is reported for downstream service flows or when AQM is disabled. Other The value Other(2) indicates a vendor proprietary algorithm for upstream queue management. DocsisPIE The value DocsisPIE(3) indicates the upstream queue management Proportional Integral controller Enhanced (PIE) algorithm. ImmediateAqm The value ImmediateAqm(4) indicates the Immediate Active Queue Management algorithm. For Service Flows, this attribute specifies the maximum interval between successive data transmission opportunities for a PGS Service Flow. The valid range of this parameter is specific to the CMTS. If the referenced parameter is not applicable to the direction or scheduling type of the corresponding DOCSIS QoS Parameter Set, both CMTS and CM report this attribute's value as 0. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::GuaranteedGrantInterval For Service Flows, the value of this parameter specifies the minimum granting rate for an upstream PGS service flow. The valid range of this parameter is specific to the CMTS. The value of the ParamSetDataRateUnitSetting attribute defines the units of ParamSetGuaranteedGrantRate. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::GuaranteedGrantRate For Service Flows, this attribute specifies the maximum interval (in units of microseconds) between successive request opportunities (including unicast request opportunities and piggyback request opportunities) for an upstream PGS service flow. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::GuaranteedRequestInterval For Service Flows, this attribute specifies the maximum threshold in microseconds of the ramp function used by the Immediate AQM algorithm and the Queue Protection algorithm. microseconds Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::ImmedAqmMaxThreshold For Service Flows, this attribute specifies the range in nanoseconds of the ramp function used by the Immediate AQM algorithm and the Queue Protection algorithm. It is expressed as an exponent of 2, e.g., a value of 19 means the range of the ramp will be 2^19 = 524288 ns (roughly 524 µs). log2(nanoseconds) Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::ImmedAqmRangeExponentRampFunc For Service Flows, this attribute indicates whether the activity detection function for an upstream service flow with the Proactive Grant Service scheduling type is enabled or disabled. The value 'false' is reported if the upstream PGS service flow is configured to switch between a polling mode and a granting mode based on detection of upstream activity. The value 'true' is reported if the upstream PGS service flow is configured to continuously provide grants regardless of upstream activity. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::PgsActivityDetectionDisable For Service Flows, this attribute indicates the base unit for the Service Flow traffic rate attributes Maximum Sustained Traffic Rate (ServiceMaxSustained), Minimum Reserved Traffic Rate (ServiceMinReservedRate), and Peak Traffic Rate (ServicePeakRate). For Aggregate Service Flows, this attribute indicates the base unit for the AggregateServiceFlow traffic rate attributes Maximum Aggregate Traffic Rate (ServiceMaxSustained), Minimum Reserved Traffic Rate (ServiceMinReservedRate), and Peak Traffic Rate (ServicePeakRate). The value of this attribute allows for their interpretation in units of bps, kbps, mbps, or gbps. The default value for ParamSetDataRateUnitSetting is bps. Information Model Mapping: CM-SP-CCAP-OSSIv3.1 ParamSet::DataRateUnitSetting Information Model Mapping: CM-SP-CCAP-OSSIv3.1 AggregateServiceFlow::DataRateUnitSetting bps kbps mbps gbps