This attribute is the name of the file at the CM which is to be transferred to the PNM server. The data represents the values sent to the CM by the CMTS in the last RNG-RSP that contained Pre-Equalization updates and is stored as 16 bit integers for the I and Q data. This object cannot be changed while a file generation is in progress. It will return a value of 'inconsistentValue' if set while the value of 'docsPnmCmUsPreEqMeasStatus' is set to a value of 'busy'. If the value of this object is the DEFVAL (empty string), then a default filename value will be used. Otherwise the value set will be used as the filename. If a default filename is generated, then that value will be returned in this object and will represent the filename that was used for the test. All subsequent tests should set this object to a meaningful value or to an 'empty string' value (to generate a new default filename) before starting a new test. If a default filename value is used, it is generated as the test name plus the CM MAC Address plus the 'epoch time'. The epoch time (also known as 'unix time') is defined as the number of seconds that have elapsed since midnight Coordinated Universal Time (UTC), Thursday, 1 January 1970. Hence, the format would be: PNMUsPreEqLastUpdate_<CM MAC address>_<epoch> For example: PNMUsPreEqLastUpdate_0010181A2D11_1403405123 The data file is comprised of a header plus the Pre-EQ Data. The header is composed of ordered fixed-length fields. Unless otherwise specified, the header fields contain hex values that are right-justified within the field. If necessary the field is left-padded with zero values. Syntax of the file is as follows: File Type set to '504E4D07' (without the quotes) 4 bytes Capture Time 4 bytes Upstream Channel Id 1 byte CM MAC Address 6 bytes CMTS MAC Address 6 bytes Subcarrier zero frequency in Hz 4 bytes FirstActiveSubcarrierIndex 4 bytes Subcarrier spacing in kHz 1 byte Length in bytes of Pre-EQ Data that follows 4 bytes Pre-EQ coefficient Data ComplexData