Minimum Impulse Noise Protection on Downstream direction. The minimum impulse noise protection for the bearer channel, expressed in symbols. The parameter can take the following values: noProtection (i.e., INP not required), halfSymbol (i.e., INP length is 1/2 symbol) and 1-16 symbols in steps of 1 symbol. Options: 1. noProtection (1) - Indicates that the INP value is 0 2. halfSymbol (2) - Indicates that the INP value is 0.5 3. singleSymbol (3) - Indicates that the INP value is 1 4. twoSymbols (4) - Indicates that the INP value is 2 5. threeSymbols (5) - Indicates that the INP value is 3 6. fourSymbols (6) - Indicates that the INP value is 4 7. fiveSymbols (7) - Indicates that the INP value is 5 8. sixSymbols (8) - Indicates that the INP value is 6 9. sevenSymbols (9) - Indicates that the INP value is 7 10. eightSymbols (10) - Indicates that the INP value is 8 11. nineSymbols (11) - Indicates that the INP value is 9 12. tenSymbols (12) - Indicates that the INP value is 10 13. elevenSymbols (13) - Indicates that the INP value is 11 14. twelveSymbols (14) - Indicates that the INP value is 12 15. thirteenSymbols (15) - Indicates that the INP value is 13 16. fourteenSymbols (16) - Indicates that the INP value is 14 17. fifteenSymbols (17) - Indicates that the INP value is 15 18. sixteenSymbols (18) - Indicates that the INP value is 16 19. invalidValue(-1) - Invalid value