系统内冗余或重复数据的度量，表明存储和潜在性能问题效率低下。
1 CR = 0.7 FDR
1 FDR = 1.429 CR
例子:
将15 频道冗余转换为频级冗余：
15 CR = 10.5 FDR
| 频道冗余 | 频级冗余 |
|---|---|
| 0.01 CR | 0.007 FDR |
| 0.1 CR | 0.07 FDR |
| 1 CR | 0.7 FDR |
| 2 CR | 1.4 FDR |
| 3 CR | 2.1 FDR |
| 5 CR | 3.5 FDR |
| 10 CR | 7 FDR |
| 20 CR | 14 FDR |
| 30 CR | 21 FDR |
| 40 CR | 28 FDR |
| 50 CR | 35 FDR |
| 60 CR | 42 FDR |
| 70 CR | 49 FDR |
| 80 CR | 56 FDR |
| 90 CR | 63 FDR |
| 100 CR | 70 FDR |
| 250 CR | 175 FDR |
| 500 CR | 350 FDR |
| 750 CR | 525 FDR |
| 1000 CR | 700 FDR |
| 10000 CR | 7,000 FDR |
| 100000 CR | 70,000 FDR |
规则