This data type represents power levels that are normally expressed in dBmV. Units are in tenths of a dBmV; for example, 5.1 dBmV will be represented as 51. This data type represents power levels that are normally expressed in dB. Units are in tenths of a dB; for example, 5.1 dB will be represented as 51. Indicates the DOCSIS Upstream Channel Type. Information not available Time Division Multiple Access Advanced Time Division Multiple Access Synchronous Code Division Multiple Access Simultaneous support of TDMA and A-TDMA modes This data type represents the equalizer data as measured at the receiver interface. The format of the equalizer follows the structure of the Transmit Equalization Adjust RNG-RSP TLV of DOCSIS RFI v2.0. The equalizer coefficients are considered signed 16-bit integers in the range from -32768 (0x8000) to 32767 (0x7FFF). DOCSIS specifications require up to a maximum of 64 equalizer taps (n + m); therefore, this object size can be up to 260 bytes (4 + 4x64). The minimum object size (other than zero) for a t-spaced tap with a minimum of 8 symbols will be 36 (4 + 4x8). See {{bibref|CM-SP-RFIv2.0|Figure 8-23}}. This data type defines the CM connectivity state as reported by the CM. {{enum}} See {{bibref|CM-SP-MULPIv3.0}}, Cable Modem - CMTS Interaction. indicates any state not described below indicates that the CM has not started the registration process yet indicates that the CM has not initiated or completed the synchronization of the downstream physical layer indicates that the CM has completed the synchronization of the downstream physical layer indicates that the CM has completed the upstream parameters acquisition or have completed the downstream and upstream service groups resolution, whether the CM is registering in a pre-3.0 or a 3.0 CMTS indicates that the CM has completed initial ranging and received a Ranging Status of success from the CMTS in the RNG-RSP message indicates that the CM has received a DHCPv4 ACK message from the CMTS indicates that the CM has successfully acquired time of day. If the ToD is acquired after the CM is operational, this value should not be reported indicates that the CM has successfully completed the BPI initialization process indicates that the CM has completed the config file download process indicates that the CM has successfully completed the Registration process with the CMTS indicates that the CM has completed all necessary initialization steps and is operational indicates that the CM has received a registration aborted notification from the CMTS indicates that the CM has sent an Auth Info message for EAE indicates that the CM has sent a DHCPv4 DISCOVER to gain IP connectivity indicates that the CM has sent an DHCPv6 Solicit message indicates that the CM has received a DHCPv6 Reply message from the CMTS indicates that the CM has sent a Registration Request (REG-REQ or REG-REQ-MP) indicates that the CM has started the BPI initialization process as indicated in the CM config file. If the CM already performed EAE, this state is skipped by the CM indicates that the registration process was completed, but the network access option in the received configuration file prohibits forwarding indicates that the CM is attempting to determine its MD-DS-SG indicates that the CM has initiated the ranging process indicates that the CM is instructed to mute all channels in the CM-CTRL-REQ message from CMTS This data type represents a sequence of spectral amplitudes. Each spectral amplitude value corresponds to a bin. The format of the bin measurement is as follows. Sequence of: : 4 bytes: ChCenterFreq :: The center frequency of the upstream channel. : 4 bytes: FreqSpan :: The width in Hz of the band across which the spectral amplitudes characterizing the channel are measured. : 4 bytes: NumberOfBins :: The number of data points or bins that compose the spectral data. The leftmost bin corresponds to the lower band edge, the rightmost bin corresponds to the upper band edge, and the middle bin center is aligned with the center frequency of the analysis span. : 4 bytes: :: BinSpacing The frequency separation between adjacent bin centers. It is derived from the frequency span and the number of bins or data points. The bin spacing is computed as: ::: BinSpacing = FrequencySpan/(NumberOfBins -1) ::The larger the number of bins the finer the resolution. : 4 bytes: ResolutionBW :: The resolution bandwidth or equivalent noise bandwidth of each bin. If spectral windowing is used (based on vendor implementation), the bin spacing and resolution bandwidth would not generally be the same. : n bytes: Amplitude (2 bytes * NumberOfBins) :: A sequence of two byte elements. Each element represents the spectral amplitudes in relation to the expected received signal power of a bin, in units of 0.01dB. That is, a test CMTS input signal with square-root raised-cosine spectrum, bandwidth equal to the expected received signal bandwidth, and power equal to the expected received signal power, which is present for the entire spectrum sampling period, will exhibit a spectrum measurement of 0 dB average power in each bin of the signal passband. Each bin element amplitude value format is 2's complement which provides a range of -327.68 dB to 327.67 dB amplitude value for the bin measurement. This object controls the windowing function which will be used when performing the discrete Fourier transform for the analysis. Note that all window functions may not be supported by all devices. If an attempt is made to set the object to an unsupported window function, an error of inconsistentValue will be returned. This data type represents a single TLV encoding. This first octet represents the Type of the TLV. The second octet represents an unsigned 8-bit Length of the subsequent Value part of the TLV. The remaining octets represent the value. The Value could be an atomic value or a sequence of one or more sub-TLVs. See {{bibref|CM-SP-MULPIv3.0}}, Common Radio Frequency Interface Encodings Annex. This data type defines the CM ranging state as reported by the CMTS. The enumerated values associated with the RangingState are: {{enum}} See {{bibref|CM-SP-MULPIv3.0}}, Cable Modem - CMTS Interaction. indicates any state not described below indicates that the CMTS has sent a ranging abort indicates that the CM ranging retry limit has exceeded indicates that the CMTS has sent a ranging success in the ranging response indicates that the CMTS has sent a ranging continue in the ranging response indicates that the T4 timer expired on the CM DOCSIS object. This object models the DOCSIS 3.x cable interface objects. This attribute contains the TLV encoding for TLV-5 sent in a REG-REQ. The first byte of this encoding is expected to be 0x05. See {{bibref|CM-SP-MULPIv3.0}}, Modem Capabilities Encoding in the Common Radio Frequency Interface Encodings Annex. This attribute contains the TLV encoding for TLV-5 received in a REG-RSP. The first byte of this encoding is expected to be 0x05. See {{bibref|CM-SP-MULPIv3.0}}, Modem Capabilities Encoding in the Common Radio Frequency Interface Encodings Annex. {{numentries}} {{numentries}} {{numentries}} {{numentries}} {{numentries}} DOCSIS Downstream interface table (a stackable interface object as described in {{bibref|TR-181i2|Section 4.2}}). This table models the PHY DOCSIS Downstream interface. Enables or disables the interface. This parameter is based on ''ifAdminStatus'' from {{bibref|RFC2863}}. The current operational state of the interface (see {{bibref|TR-181i2|Section 4.2.2}}). {{enum}} When {{param|Enable}} is {{false}} then {{param}} SHOULD normally be {{enum|Down}} (or {{enum|NotPresent}} or {{enum|Error}} if there is a fault condition on the interface). When {{param|Enable}} is changed to {{true}} then {{param}} SHOULD change to {{enum|Up}} if and only if the interface is able to transmit and receive network traffic; it SHOULD change to {{enum|Dormant}} if and only if the interface is operable but is waiting for external actions before it can transmit and receive network traffic (and subsequently change to {{enum|Up}} if still operable when the expected actions have completed); it SHOULD change to {{enum|LowerLayerDown}} if and only if the interface is prevented from entering the {{enum|Up}} state because one or more of the interfaces beneath it is down; it SHOULD remain in the {{enum|Error}} state if there is an error or other fault condition detected on the interface; it SHOULD remain in the {{enum|NotPresent}} state if the interface has missing (typically hardware) components; it SHOULD change to {{enum|Unknown}} if the state of the interface can not be determined for some reason. This parameter is based on ''ifOperStatus'' from {{bibref|RFC2863}}. {{datatype|expand}} The textual name of the interface as assigned by the CPE. The accumulated time in {{units}} since the interface entered its current operational state. {{list}} {{reference|an interface object that is stacked immediately below this interface object}} See {{bibref|TR-181i2|Section 4.2.1}}. Note: Since {{object}} is a layer 1 interface, it is expected that {{param}} will not be used. Indicates whether the interface points towards the Internet ({{true}}) or towards End Devices ({{false}}). For example: * For an Internet Gateway Device, {{param}} will be {{true}} for all WAN interfaces and {{false}} for all LAN interfaces. * For a standalone WiFi Access Point that is connected via Ethernet to an Internet Gateway Device, {{param}} will be {{true}} for the Ethernet interface and {{false}} for the WiFi Radio interface. * For an End Device, {{param}} will be {{true}} for all interfaces. The maximum upstream and downstream PHY bit rate supported by this interface (expressed in {{units}}). A value of -1 indicates automatic selection of the maximum bit rate. The current upstream and downstream PHY bit rate on this interface (expressed in {{units}}). A value of 0 indicates that the current bit rate is unknown. Downstream Channels associated with this {{object}} interface. Throughput statistics for this interface. The CPE MUST reset the interface's Stats parameters (unless otherwise stated in individual object or parameter descriptions) either when the interface becomes operationally down due to a previous administrative down (i.e. the interface's {{param|#.Status}} parameter transitions to a down state after the interface is disabled) or when the interface becomes administratively up (i.e. the interface's {{param|#.Enable}} parameter transitions from {{false}} to {{true}}). Administrative and operational interface status is discussed in {{bibref|TR-181i2|section 4.2.2}}. The total number of bytes transmitted out of the interface, including framing characters. The total number of bytes received on the interface, including framing characters. The total number of packets transmitted out of the interface. The total number of packets received on the interface. The total number of outbound packets that could not be transmitted because of errors. The total number of inbound packets that contained errors preventing them from being delivered to a higher-layer protocol. The total number of packets requested for transmission which were not addressed to a multicast or broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were not addressed to a multicast or broadcast address at this layer. The total number of outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space. The total number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being delivered. One possible reason for discarding such a packet could be to free up buffer space. The total number of packets that higher-level protocols requested for transmission and which were addressed to a multicast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a multicast address at this layer. The total number of packets that higher-level protocols requested for transmission and which were addressed to a broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a broadcast address at this layer. The total number of packets received via the interface which were discarded because of an unknown or unsupported protocol. DOCSIS Upstream interface table (a stackable interface object as described in {{bibref|TR-181i2|Section 4.2}}). This table models the PHY DOCSIS Upstream interface. Enables or disables the interface. This parameter is based on ''ifAdminStatus'' from {{bibref|RFC2863}}. The current operational state of the interface (see {{bibref|TR-181i2|Section 4.2.2}}). {{enum}} When {{param|Enable}} is {{false}} then {{param}} SHOULD normally be {{enum|Down}} (or {{enum|NotPresent}} or {{enum|Error}} if there is a fault condition on the interface). When {{param|Enable}} is changed to {{true}} then {{param}} SHOULD change to {{enum|Up}} if and only if the interface is able to transmit and receive network traffic; it SHOULD change to {{enum|Dormant}} if and only if the interface is operable but is waiting for external actions before it can transmit and receive network traffic (and subsequently change to {{enum|Up}} if still operable when the expected actions have completed); it SHOULD change to {{enum|LowerLayerDown}} if and only if the interface is prevented from entering the {{enum|Up}} state because one or more of the interfaces beneath it is down; it SHOULD remain in the {{enum|Error}} state if there is an error or other fault condition detected on the interface; it SHOULD remain in the {{enum|NotPresent}} state if the interface has missing (typically hardware) components; it SHOULD change to {{enum|Unknown}} if the state of the interface can not be determined for some reason. This parameter is based on ''ifOperStatus'' from {{bibref|RFC2863}}. {{datatype|expand}} The textual name of the interface as assigned by the CPE. The accumulated time in {{units}} since the interface entered its current operational state. {{list}} {{reference|an interface object that is stacked immediately below this interface object}} See {{bibref|TR-181i2|Section 4.2.1}}. Note: Since {{object}} is a layer 1 interface, it is expected that {{param}} will not be used. Indicates whether the interface points towards the Internet ({{true}}) or towards End Devices ({{false}}). For example: * For an Internet Gateway Device, {{param}} will be {{true}} for all WAN interfaces and {{false}} for all LAN interfaces. * For a standalone WiFi Access Point that is connected via Ethernet to an Internet Gateway Device, {{param}} will be {{true}} for the Ethernet interface and {{false}} for the WiFi Radio interface. * For an End Device, {{param}} will be {{true}} for all interfaces. The maximum upstream and downstream PHY bit rate supported by this interface (expressed in {{units}}). A value of -1 indicates automatic selection of the maximum bit rate. The current upstream and downstream PHY bit rate on this interface (expressed in {{units}}). A value of 0 indicates that the current bit rate is unknown. Upstream Channels associated with this {{object}} interface. Throughput statistics for this interface. The CPE MUST reset the interface's Stats parameters (unless otherwise stated in individual object or parameter descriptions) either when the interface becomes operationally down due to a previous administrative down (i.e. the interface's {{param|#.Status}} parameter transitions to a down state after the interface is disabled) or when the interface becomes administratively up (i.e. the interface's {{param|#.Enable}} parameter transitions from {{false}} to {{true}}). Administrative and operational interface status is discussed in {{bibref|TR-181i2|section 4.2.2}}. The total number of bytes transmitted out of the interface, including framing characters. The total number of bytes received on the interface, including framing characters. The total number of packets transmitted out of the interface. The total number of packets received on the interface. The total number of outbound packets that could not be transmitted because of errors. The total number of inbound packets that contained errors preventing them from being delivered to a higher-layer protocol. The total number of packets requested for transmission which were not addressed to a multicast or broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were not addressed to a multicast or broadcast address at this layer. The total number of outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space. The total number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being delivered. One possible reason for discarding such a packet could be to free up buffer space. The total number of packets that higher-level protocols requested for transmission and which were addressed to a multicast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a multicast address at this layer. The total number of packets that higher-level protocols requested for transmission and which were addressed to a broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a broadcast address at this layer. The total number of packets received via the interface which were discarded because of an unknown or unsupported protocol. This table describes the attributes of downstream channels (frequency bands). See {{bibref|CM-SP-RFIv2.0|Tables 6-16, and 6-17}}. {{datatype|expand}} The Cable Modem Termination System identification of the downstream channel within this particular MAC interface. if the interface is down, the object returns the most current value. If the downstream channel ID is unknown, this object returns a value of 0. The center of the downstream frequency associated with this channel. This object will return the current tuner frequency, measured in {{units}}. See {{bibref|CM-SP-RFIv2.0|Section 6.3.3}}. The bandwidth in {{units}} of this downstream channel. Most implementations are expected to support a channel width of 6 MHz (North America) and/or 8 MHz (Europe). See {{bibref|CM-SP-RFIv2.0|Table 6-17}}. The modulation type associated with this downstream channel. If the interface is down, this object either returns the configured value (from the CMTS), the most current value (from the CM), or the value of {{enum|Unknown}}. See the reference for specifics on the modulation profiles implied by {{enum|QAM64}} and {{enum|QAM256}}. {{enum}} See {{bibref|CM-SP-RFIv2.0|Table 6-17.}} The Forward Error Correction (FEC) interleaving used for this downstream channel. The value {{enum|Taps12increment17}} is supported by EuroDOCSIS cable systems only, and the others by DOCSIS cable systems. If the interface is down, this object either returns the configured value (from the CMTS), the most current value (from the CM), or the value of {{enum|Unknown}}. The value of {{enum|Other}} is returned if the interleave is known but not defined in the above list. See the reference for the FEC configuration described by the setting of this object. {{enum}} See {{bibref|CM-SP-RFIv2.0|Table 6-15}}. Protection 5.9/4.1 usec, latency .22/.15 msec Protection 12/8.2 usec, latency .48/.33 msec Protection 24/16 usec, latency .98/.68 msec Protection 47/33 usec, latency 2/1.4 msec Protection 95/66 usec, latency 4/2.8 msec Protection 18/14 usec, latency 0.43/0.32 msec The received power level. If the interface is down, this object either returns the configured value (from the CMTS), the most current value (from the CM) or the value of 0. See the reference for recommended and required power levels. See {{bibref|CM-SP-RFIv2.0|Tables 6-16, 6-17}}. The value of this object indicates the conformance of the implementation to important regional cable standards. {{enum}} See {{bibref|CM-SP-RFIv2.0|Sections 6.3.1, and H.3.1}}. Annex A from ITU-T J.83 is used (equivalent to EN 300 429) Annex B from ITU-T J.83 is used Annex C from ITU-T J.83 is used Describes the PHY signal quality of downstream channels. Signal/Noise ratio as perceived for this channel. Describes the Signal/Noise of the downstream channel, measured in {{units}}. See {{bibref|CM-SP-RFIv2.0|Tables 4-1 and 4-2}}. Microreflections, including in-channel response as perceived on this interface, measured in {{units}} (i.e., dBc below the signal level). This object is not assumed to return an absolutely accurate value, but it gives a rough indication of microreflections received on this interface. It is up to the implementer to provide information as accurately as possible. See {{bibref|CM-SP-RFIv2.0|Tables 4-1 and 4-2}}. Returns the equalization data for the downstream channel. * An equalization value indicating an equalization average for the upstream channel. Those values have vendor-dependent interpretations. * Return a zero-length OCTET STRING to indicate that the value is unknown or if there is no equalization data available or defined. See {{bibref|CM-SP-RFIv2.0|Figure 6-23}}. Codewords received on this channel without error. This includes all codewords, whether or not they were part of frames destined for this device. Discontinuities in the value of this counter can occur at reinitialization of the managed system. See {{bibref|CM-SP-RFIv2.0|Sections 6.2.4, and 6.3.6}}. Codewords received on this channel with correctable errors. This includes all codewords, whether or not they were part of frames destined for this device. Discontinuities in the value of this counter can occur at reinitialization of the managed system. See {{bibref|CM-SP-RFIv2.0|Sections 6.2.4, and 6.3.6}}. Codewords received on this channel with uncorrectable errors. This includes all codewords, whether or not they were part of frames destined for this device. Discontinuities in the value of this counter can occur at reinitialization of the managed system. See {{bibref|CM-SP-RFIv2.0|Sections 6.2.4, 6.3.6}}. Describes the received modulation error ratio of each downstream channel. {{param}} provides an in-channel received Modulation Error Ratio (MER), measured in {{units}}. {{param}} is defined as an estimate, provided by the demodulator, of the ratio: (average constellation energy with equally likely symbols) / (average squared magnitude of error vector) {{param}} is measured just prior to FEC (trellis/Reed-Solomon) decoding. {{param}} includes the effects of the HFC channel as well as implementation effects of the modulator and demodulator. Error vector estimation may vary among demodulator implementations. In the case of S-CDMA mode, RxMER is measured on the de-spread signal. {{param}} is a statistically significant number of symbols processed to arrive at the RxMER value. The Downstream Adaptive Decision Feedback Equalizer (DFE) is implemented as a Feedforward Equalizer (FFE) and a Feedback Equalizer (FBE). In order to evaluate the composite DFE response it is necessary to normalize the FBE coefficients to 1 and then evaluate the FFT(hffe)/FFT(1,hfbe), where the hfbe coefficients have been normalized to 1 using FbeNormalizationCoefficient. The complex data representing the hffe and hfbe coefficients is contained in the EqualizationData MIB. It is possible to implement the DFE such that the response is evaluated as FFT(hffe)/FFT(1,-hfbe). In this case the FbeNormalizationCoefficient will be reported as a negative number and the response will be evaluated as FFT(hffe)/FFT(1,hfbe). This table describes the attributes of attached upstream channels. {{datatype|expand}} The CMTS identification of the upstream channel. The center of the frequency band associated with this upstream interface. This object returns 0 if the frequency is undefined or unknown. Minimum permitted upstream frequency is 5,000,000 {{units}} for current technology. See {{bibref|CM-SP-RFIv2.0|Table 4-2}}. The bandwidth in {{units}} of this upstream interface. This object returns 0 if the interface width is undefined or unknown. Minimum permitted interface width is currently 200,000 {{units}}. See {{bibref|CM-SP-RFIv2.0|Table 6-5}}. Applicable to TDMA and ATDMA channel types only. The number of {{units}} ticks in each upstream mini-slot. Returns zero if the value is undefined or unknown or in case of an SCDMA channel. See {{bibref|CM-SP-RFIv2.0|Section 8.1.2.4}}. A measure of the current round trip time obtained from the ranging offset (initial ranging offset + ranging offset adjustments). Used for timing of CM upstream transmissions to ensure synchronized arrivals at the CMTS. Units are one 64th fraction of 6.25 microseconds. See {{bibref|CM-SP-RFIv2.0|Section 6.2.19}}. The initial random backoff window to use when retrying Ranging Requests. Expressed as a power of 2. A value of 16 at the CMTS indicates that a proprietary adaptive retry mechanism is to be used. See {{bibref|CM-SP-RFIv2.0|Sections 8.3.4, and 9.4}}. The final random backoff window to use when retrying Ranging Requests. Expressed as a power of 2. A value of 16 at the CMTS indicates that a proprietary adaptive retry mechanism is to be used. See {{bibref|CM-SP-RFIv2.0|Section 8.3.4, and 9.4}}. The initial random backoff window to use when retrying transmissions. Expressed as a power of 2. A value of 16 at the CMTS indicates that a proprietary adaptive retry mechanism is to be used. See {{bibref|CM-SP-RFIv2.0|Section 8.3.4, and 9.4}}. The final random backoff window to use when retrying transmissions. Expressed as a power of 2. A value of 16 at the CMTS indicates that a proprietary adaptive retry mechanism is to be used. See {{bibref|CM-SP-RFIv2.0|Section 8.3.4, and 9.4}}. This object provides Upstream channel information previously available in the SNMP table docsIfCmStatusTable. This attribute represents the operational CM transmit power for this SC-QAM upstream channel, in {{units}}. In order for this attribute to provide consistent information under all circumstances, a 3.1 CM will report the average total power for the SC-QAM channel the same as was done for DOCSIS 3.0, regardless of whether it is operating with a 3.1 or a 3.0 CMTS. The value that is reported was referred to as Pr in the DOCSIS 3.0 PHY Spec. This attribute denotes the number of times counter T3 expired in the CM for this upstream channel. Discontinuities in the value of this counter can occur at re-initialization of the managed system. See {{bibref|RFC2863}}. This attribute denotes the number of times counter T4 expired in the CM for this upstream channel. Discontinuities in the value of this counter can occur at re-initialization of the managed system. See {{bibref|RFC2863}}. This attribute denotes the number of times the ranging process was aborted by the CMTS. Discontinuities in the value of this counter can occur at re-initialization of the managed system. See {{bibref|RFC2863}}. This attribute indicates modulation type status currently used by the CM for this upstream channel. Since this object specifically identifies PHY Layer mode, the shared upstream channel type "tdmaAndAtdma" is not permitted. See {{bibref|RFC2863}}. This attribute indicates the pre-equalization data for the specified upstream Channel on this CM after convolution with data indicated in the RNG-RSP. This data is valid when docsIfUpChannelPreEqEnable RFC 4546 is set to {{true}}. See {{bibref|RFC2863}} and {{bibref|RFC4546}}. This attribute denotes the number of times for excessive T3 timeouts. Discontinuities in the value of this counter can occur at re-initialization of the managed system. See {{bibref|RFC2863}}. This attribute denotes whether the upstream channel is muted. See {{bibref|CM-SP-MULPIv3.0}}, Media Access Control specification. This attribute denotes the ranging state of the CM. See {{bibref|CM-SP-MULPIv3.0}}, Media Access Control specification. DOCSIS Layer 2 (MAC) interface table (a stackable interface object as described in {{bibref|TR-181i2|Section 4.2}}). This table models the MAC level DOCSIS interface. Enables or disables the interface. This parameter is based on ''ifAdminStatus'' from {{bibref|RFC2863}}. The current operational state of the interface (see {{bibref|TR-181i2|Section 4.2.2}}). {{enum}} When {{param|Enable}} is {{false}} then {{param}} SHOULD normally be {{enum|Down}} (or {{enum|NotPresent}} or {{enum|Error}} if there is a fault condition on the interface). When {{param|Enable}} is changed to {{true}} then {{param}} SHOULD change to {{enum|Up}} if and only if the interface is able to transmit and receive network traffic; it SHOULD change to {{enum|Dormant}} if and only if the interface is operable but is waiting for external actions before it can transmit and receive network traffic (and subsequently change to {{enum|Up}} if still operable when the expected actions have completed); it SHOULD change to {{enum|LowerLayerDown}} if and only if the interface is prevented from entering the {{enum|Up}} state because one or more of the interfaces beneath it is down; it SHOULD remain in the {{enum|Error}} state if there is an error or other fault condition detected on the interface; it SHOULD remain in the {{enum|NotPresent}} state if the interface has missing (typically hardware) components; it SHOULD change to {{enum|Unknown}} if the state of the interface can not be determined for some reason. This parameter is based on ''ifOperStatus'' from {{bibref|RFC2863}}. {{datatype|expand}} The textual name of the interface as assigned by the CPE. The accumulated time in {{units}} since the interface entered its current operational state. {{list}} {{reference|an interface object that is stacked immediately below this interface object}} See {{bibref|TR-181i2|Section 4.2.1}}. The MAC Address of the interface. Identifies the CMTS that is believed to control this MAC domain. This will be the source address from SYNC, MAP, and other MAC-layer messages. If the CMTS is unknown, returns 00-00-00-00-00-00. See {{bibref|CM-SP-RFIv2.0|Section 8.2.2}}. Identifies the capabilities of the MAC implementation at this interface. Note that packet transmission is always supported. Therefore, there is no specific bit required to explicitly indicate this capability. A string identifying the version of the modem firmware currently installed for this interface. This is applicable only when the modem firmware is separable from the overall CPE software. Indication of the DOCSIS capability of the device. See {{bibref|CM-SP-RFIv2.0|Annex G}}. {{param}} specifies how the IP provisioning mode is configured. The CM relies upon the CMTS to facilitate the successful IP address acquisition independently of the MDD. {{enum}} See {{bibref|CM-SP-MULPIv3.0}}, IP Initialization Parameters TLV Section. The Cable Modem will initiate the acquisition of a single IPv4 address for the Cable Modem management stack. The Cable Modem will initiate the acquisition of a single IPv6 address for the Cable Modem management stack. The Cable Modem will initiate the acquisition of an IPv6 or IPv4 address as directed by the MDD message for provisioning and operation. Throughput statistics for this interface. The CPE MUST reset the interface's Stats parameters (unless otherwise stated in individual object or parameter descriptions) either when the interface becomes operationally down due to a previous administrative down (i.e. the interface's {{param|#.Status}} parameter transitions to a down state after the interface is disabled) or when the interface becomes administratively up (i.e. the interface's {{param|#.Enable}} parameter transitions from {{false}} to {{true}}). Administrative and operational interface status is discussed in {{bibref|TR-181i2|section 4.2.2}}. The total number of bytes transmitted out of the interface, including framing characters. The total number of bytes received on the interface, including framing characters. The total number of packets transmitted out of the interface. The total number of packets received on the interface. The total number of outbound packets that could not be transmitted because of errors. The total number of inbound packets that contained errors preventing them from being delivered to a higher-layer protocol. The total number of packets requested for transmission which were not addressed to a multicast or broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were not addressed to a multicast or broadcast address at this layer. The total number of outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space. The total number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being delivered. One possible reason for discarding such a packet could be to free up buffer space. The total number of packets that higher-level protocols requested for transmission and which were addressed to a multicast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a multicast address at this layer. The total number of packets that higher-level protocols requested for transmission and which were addressed to a broadcast address at this layer, including those that were discarded or not sent. The total number of received packets, delivered by this layer to a higher layer, which were addressed to a broadcast address at this layer. The total number of packets received via the interface which were discarded because of an unknown or unsupported protocol. This object defines attributes of the CM connectivity status. This object provides CM connectivity status information of the CM previously available in the SNMP table docsIfCmStatusTable. See {{bibref|RFC4546}}. This attribute denotes the current CM connectivity state. For the case of IP acquisition related states, this attribute reflects states for the current CM provisioning mode, not the {{enum|Other}} DHCP process associated with dual stack operation. See {{bibref|CM-SP-MULPIv3.0}}, Establishing IP Connectivity. This attribute denotes the status code for CM as defined in the OSSI Specification. The status code consists of a single character indicating error groups, followed by a two-or three-digit number indicating the status condition, followed by a decimal. An example of a returned value could be "T101.0". The zero-length hex string indicates no status code yet registered. See {{bibref|CM-SP-OSSIv3.0}}, Format and Content for Event, Syslog, and SNMP Notification Annex. This attribute denotes the number of times the CM reset or initialized this interface. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times the CM lost synchronization with the downstream channel. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times the CM received invalid MAP messages. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times the CM received invalid UCD messages. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times the CM received invalid ranging response messages. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times the CM received invalid registration response messages. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times counter T1 expired in the CM. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute denotes the number of times counter T2 expired in the CM. Discontinuities in the value of this counter can occur at re-initialization of the managed system, and at other times as indicated by the value of ifCounterDiscontinuityTime for the CM MAC Domain interface. See {{bibref|RFC2863}}. This attribute is used to enable or disable the spectrum analyzer feature. Setting this attribute to {{true}} triggers the CM to initiate measurements for the spectrum analyzer feature based on the other configuration attributes for the feature. By default, the feature is disabled unless explicitly enabled. Note that the feature may be disabled by the system under certain circumstances if the spectrum analyzer would affect critical services. In such a case, the attribute will return {{false}} when read, and will reject sets to {{true}} with an error. Once the feature is enabled, any change to this object's configuration might not be effective until the feature is re-enabled again. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This attribute controls the length of time (in {{units}}) after the last spectrum analysis measurement before the feature is automatically disabled. If set to a value of 0, the feature will remain enabled until it is explicitly disabled. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This attribute controls the center frequency (in {{units}}) of the first segment for the spectrum analysis measurement. The frequency bins for this segment lie symmetrically to the left and right of this center frequency. If the number of bins in a segment is odd, the segment center frequency lies directly on the center bin. If the number of bins in a segment is even, the segment center frequency lies halfway between two bins. Changing the value of this attribute may result in changes to the {{object|Result}} table. Note that if this parameter is set to an invalid value, the device may return an error, or may adjust the value of the parameter to the closest valid value. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This attribute controls the center frequency (in {{units}}) of the last segment of the spectrum analysis measurement. The frequency bins for this segment lie symmetrically to the left and right of this center frequency. If the number of bins in a segment is odd, the segment center frequency lies directly on the center bin. If the number of bins in a segment is even, the segment center frequency lies halfway between two bins. The value of the {{param}} should be equal to the {{param|FirstSegmentCenterFrequency}} plus and integer number of segment spans as determined by the {{param|SegmentFrequencySpan}}. Changing the value of this attribute may result in changes to the {{object|Result}} table. Note that if this parameter is set to an invalid value, the device may return an error, or may adjust the value of the parameter to the closest valid value. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This attribute controls the frequency span (in {{units}}) of each segment (instance) of the {{object|Result.{i}}} table. If set to a value of 0, then a default span will be chosen based on the hardware capabilities of the device. Segments are contiguous from the {{param|FirstSegmentCenterFrequency}} to the {{param|LastSegmentCenterFrequency}} and the center frequency for each successive segment is incremented by the {{param}}. The number of segments is ({{param|LastSegmentCenterFrequency}} - {{param|FirstSegmentCenterFrequency}})/{{param}} + 1. A segment is equivalent to an instance in the {{object|Result}} table. The chosen {{param}} affects the number of entries in {{object|Result}} table. A more granular {{param}} may adversely affect the amount of time needed to query the table entries in addition to possibly increasing the acquisition time. Changing the value of this attribute may result in changes to {{object|Result}} table. Note that if this parameter is set to an invalid value, the device may return an error, or may adjust the value of the parameter to the closest valid value. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This parameter controls the number of bins collected by the measurement performed for each segment (instance) in the {{object|Result}} table. Note that if this parameter is set to an invalid value, the device may return an error, or may adjust the value of the parameter to the closest valid value. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This parameter allows the user to request an equivalent noise bandwidth (measured in {{units}}) for the resolution bandwidth filter used in the spectrum analysis. This corresponds to the spectral width of the window function used when performing a discrete Fourier transform for the analysis. The window function which corresponds to a value written to this parameter may be obtained by reading the value of {{param|WindowFunction}}. If an unsupported value is requested, the device may return an error, or choose the closest valid value to the one which is requested. If the closest value is chosen, then a subsequent read of this parameter will return the actual value which is in use. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This parameter controls or indicates the windowing function which will be used when performing the discrete Fourier transform for the analysis. The {{param}} and the Equivalent Noise Bandwidth are related. If a particular {{param}} is selected, then the {{param|EquivalentNoiseBandwidth}} for the function which is in use, will be reported by the {{param|EquivalentNoiseBandwidth}} parameter. Alternatively if an {{param|EquivalentNoiseBandwidth}} value is chosen then if a {{param}} function representing that {{param|EquivalentNoiseBandwidth}} is defined in the CM, that value will be reported in {{param}}, or a value of {{enum|Other}} will be reported. Use of "modern" windowing functions not yet defined will likely be reported as {{enum|Other}}. {{enum}} Note that all window functions may not be supported by all devices. If an attempt is made to set the object to an unsupported window function, or if writing of the WindowFunction is not supported, an error will be returned. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. This parameter controls the number of averages that will be performed on spectral bins. The average will be computed using the 'leaky integrator' method, where: reported bin value = alpha*accumulated bin values + (1-alpha)*current bin value. Alpha is one minus the reciprocal of the number of averages. For example, if N=25, then alpha = 0.96. A value of 1 indicates no averaging. Re-writing the number of averages will restart the averaging process. If there are no accumulated values, the accumulators are made equal to the first measured bin amplitudes. If an attempt is made to set the parameter to an unsupported number of averages, an error will be returned. See {{bibref|CM-SP-CM-OSSIv3.1}}, Proactive Network Maintenance Information Model. {{numentries}} {{section|table}}This table provides a list of spectral analysis measurements as performed across a range of center frequencies. The table is capable of representing a full scan of the spectrum. {{section|row}}Each {{object}} instance represents the spectral analysis around a single center frequency point in the spectrum. The center frequency (in {{units}}) of the spectral analysis span which is represented by this instance. This parameter provides a list of the spectral amplitudes as measured at the center frequency specified by the {{param|Frequency}}. The frequency bins are ordered from lowest to highest frequencies covering the frequency span. Information about the center frequency, frequency span, number of bins and resolution bandwidth are included to provide context to the measurement point. This parameter provides the total RF power present in the segment with the center frequency equal to the {{param|Frequency}} and the span equal to the {{param|#.SegmentFrequencySpan}}. The value represents the sum of the spectrum power in all of the associated bins. The value is computed by summing power (not dB) values and converting the final sum to {{units}}.