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3-8 TAS Series II Operations Manual The above command returns the level setting of the station B near end echo attenuator. The C associated with the command parameter L selects the particular echo attenuator. /GD,W/ The above command reads back the identification number for the selected gain filter #2 The value returned is dependent upon the last programming or readback direction selection command (/AD,I1/ or /AD,I2/ or /AD,Ii3/). If I3 is the command parameter sent, then generator 1 is selected for readback. /SG,FA/ The above command reads back the frequency of dial tone frequency 1. The A associated with the command parameter F selects the particular type of tone and whether the frequency is 1 or 2. Readback Response Format The readback command response returns the selected parameter information to the user. The following provides possible responses to the four previous readback command examples. /AD16,I2/ Impairments generator 2 is selected for programming or readback. /EC30,LC200/ The station B near end echo attenuator is set to a level of 20.0 dB attenuation. /GD17,W13/ The gain filter #2 is set to "Worst case" CCITT M1020 Gain Characteristic. /SG20,FA4800/ The dial tone frequency 1 is set to 480.0 Hz.