Nortel 5399 参考指南
27
Parameter 28
Model 5399 RAC Digital Modem Configuration Notes
SHAP: Shaping in Receiver - Constellation shaping is a method for
improving performance in the presence of Gaussian noise by shaping
the signal constellation (the amount of spacing between individual
amplitude and phase change points).
0: Negotiable
1: Mandatory
10: Disable
11: Reserved
the signal constellation (the amount of spacing between individual
amplitude and phase change points).
0: Negotiable
1: Mandatory
10: Disable
11: Reserved
NE: Nonlinear Encoder - Nonlinear encoding is a method for improving
distortion immunity near the perimeter of a signal constellation by
introducing non-uniform two-dimensional signal point spacing.
0: Negotiable
1: Mandatory
10: Disable
11: Reserved
introducing non-uniform two-dimensional signal point spacing.
0: Negotiable
1: Mandatory
10: Disable
11: Reserved
Parameter 28
Default config_bytes Setting:
Decimal base: 14
Octal base: 016
Hexadecimal base: 0xE
Octal base: 016
Hexadecimal base: 0xE
O1: Optional Baud Rate 2743 - This supports certain country-specific
spectral requirements as well as some unusual modems.
0: Disable
1: Enable
0: Disable
1: Enable
Bit
15 14 13 12 11 10 9 8 7 6 5 4
3
2
1
0
Value
0
0
0
0
0
0
0 0 0
0
0
0
1
1
1
0
Descr.
Unused
Reserved
O3
O2
O1
R