DOCSIS-SPECTRUM is an auxiliary schema which defines Spectrum Analysis and Measurement information. OSSIv3.0-N-10.0968-2 and published as I14. Revision History: 3.5.1-A.1 Initial version. 3.5.1-A.2 Revised version includes ECN 3.7-A.2.0.0 Add semantic versioning. Remove ipdr.org references. Fix import versions. Fix spacing. Add contact info. 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. Contains the ifIndex of the CMTS logical upstream channel. The US/DS channel id as defined in docsIf3MdChCfgChId. Contains the center of the frequency band associated with the CMTS physical upstream interface. It contains zero if the frequency is undefined or unknown. hertz Contains the width of the band across which the spectral amplitudes characterizing the channel are measured. hertz 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. bins Contains the resolution bandwidth (defined as the equivalent noise bandwidth) of each bin. hertz Contains the frequency separation between adjacent bins, not to exceed 25 kHz for channel widths less than or equal 6.4 MHz. hertz 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.